2 NTP 4.2.8p17 (Harlan Stenn <stenn@ntp.org>, 2023 Jun 06)
6 Severity: HIGH (for people running 4.2.8p16)
10 - fixes 3 bugs, including a regression
15 * [Bug 3824] Spurious "ntpd: daemon failed to notify parent!" logged at
16 event_sync. Reported by Edward McGuire. <hart@ntp.org>
17 * [Bug 3822] ntpd significantly delays first poll of servers specified by name.
18 <hart@ntp.org> Miroslav Lichvar identified regression in 4.2.8p16.
19 * [Bug 3821] 4.2.8p16 misreads hex authentication keys, won't interop with
20 4.2.8p15 or earlier. Reported by Matt Nordhoff, thanks to
21 Miroslav Lichvar and Matt for rapid testing and identifying the
22 problem. <hart@ntp.org>
23 * Add tests/libntp/digests.c to catch regressions reading keys file or with
24 symmetric authentication digest output.
27 NTP 4.2.8p16 (Harlan Stenn <stenn@ntp.org>, 2023 May 30)
29 Focus: Security, Bug fixes
35 - fixes 4 vulnerabilities (3 LOW and 1 None severity),
37 - includes 15 general improvements
38 - adds support for OpenSSL-3.0
42 * [Sec 3808] Assertion failure in ntpq on malformed RT-11 date <perlinger@ntp.org>
43 * [Sec 3807] praecis_parse() in the Palisade refclock driver has a
44 hypothetical input buffer overflow. Reported by ... stenn@
45 * [Sec 3806] libntp/mstolfp.c needs bounds checking <perlinger@ntp.org>
46 - solved numerically instead of using string manipulation
47 * [Sec 3767] An OOB KoD RATE value triggers an assertion when debug is enabled.
49 * [Bug 3819] Updated libopts/Makefile.am was missing NTP_HARD_* values. <stenn@>
50 * [Bug 3817] Bounds-check "tos floor" configuration. <hart@ntp.org>
51 * [Bug 3814] First poll delay of new or cleared associations miscalculated.
53 * [Bug 3802] ntp-keygen -I default identity modulus bits too small for
54 OpenSSL 3. Reported by rmsh1216@163.com <hart@ntp.org>
55 * [Bug 3801] gpsdjson refclock gps_open() device name mishandled. <hart@ntp.org>
56 * [Bug 3800] libopts-42.1.17 does not compile with Microsoft C. <hart@ntp.org>
57 * [Bug 3799] Enable libopts noreturn compiler advice for MSC. <hart@ntp.org>
58 * [Bug 3797] Windows getaddrinfo w/AI_ADDRCONFIG fails for localhost when
59 disconnected, breaking ntpq and ntpdc. <hart@ntp.org>
60 * [Bug 3795] pollskewlist documentation uses | when it shouldn't.
61 - ntp.conf manual page and miscopt.html corrections. <hart@ntp.org>
62 * [Bug 3793] Wrong variable type passed to record_raw_stats(). <hart@ntp.org>
63 - Report and patch by Yuezhen LUAN <wei6410@sina.com>.
64 * [Bug 3786] Timer starvation on high-load Windows ntpd. <hart@ntp.org>
65 * [Bug 3784] high-load ntpd on Windows deaf after enough ICMP TTL exceeded.
67 * [Bug 3781] log "Unable to listen for broadcasts" for IPv4 <hart@ntp.org>
68 * [Bug 3774] mode 6 packets corrupted in rawstats file <hart@ntp.org>
69 - Reported by Edward McGuire, fix identified by <wei6410@sina.com>.
70 * [Bug 3758] Provide a 'device' config statement for refclocks <perlinger@ntp.org>
71 * [Bug 3757] Improve handling of Linux-PPS in NTPD <perlinger@ntp.org>
72 * [Bug 3741] 4.2.8p15 can't build with glibc 2.34 <perlinger@ntp.org>
73 * [Bug 3725] Make copyright of clk_wharton.c compatible with Debian.
74 Philippe De Muyter <phdm@macqel.be>
75 * [Bug 3724] ntp-keygen with openSSL 1.1.1 fails on Windows <perlinger@ntp.org>
76 - openssl applink needed again for openSSL-1.1.1
77 * [Bug 3719] configure.ac checks for closefrom() and getdtablesize() missing.
78 Reported by Brian Utterback, broken in 2010 by <hart@ntp.org>
79 * [Bug 3699] Problems handling drift file and restoring previous drifts <perlinger@ntp.org>
80 - command line options override config statements where applicable
81 - make initial frequency settings idempotent and reversible
82 - make sure kernel PLL gets a recovered drift componsation
83 * [Bug 3695] Fix memory leak with ntpq on Windows Server 2019 <perlinger@ntp.org>
84 * [Bug 3694] NMEA refclock seems to unnecessarily require location in messages
85 - misleading title; essentially a request to ignore the receiver status.
86 Added a mode bit for this. <perlinger@ntp.org>
87 * [Bug 3693] Improvement of error handling key lengths <perlinger@ntp.org>
88 - original patch by Richard Schmidt, with mods & unit test fixes
89 * [Bug 3692] /dev/gpsN requirement prevents KPPS <perlinger@ntp.org>
90 - implement/wrap 'realpath()' to resolve symlinks in device names
91 * [Bug 3691] Buffer Overflow reading GPSD output
92 - original patch by matt<ntpbr@mattcorallo.com>
93 - increased max PDU size to 4k to avoid truncation
94 * [Bug 3690] newline in ntp clock variable (parse) <perlinger@ntp.org>
95 - patch by Frank Kardel
96 * [Bug 3689] Extension for MD5, SHA-1 and other keys <perlinger@ntp.org>
97 - ntp{q,dc} now use the same password processing as ntpd does in the key
98 file, so having a binary secret >= 11 bytes is possible for all keys.
99 (This is a different approach to the problem than suggested)
100 * [Bug 3688] GCC 10 build errors in testsuite <perlinger@ntp.org>
101 * [Bug 3687] ntp_crypto_rand RNG status not known <perlinger@ntp.org>
102 - patch by Gerry Garvey
103 * [Bug 3682] Fixes for warnings when compiled without OpenSSL <perlinger@ntp.org>
104 - original patch by Gerry Garvey
105 * [Bug 3677] additional peer events not decoded in associations listing <perlinger@ntp.org>
106 - original patch by Gerry Garvey
107 * [Bug 3676] compiler warnings (CMAC, interrupt_buf, typo, fallthrough)
108 - applied patches by Gerry Garvey
109 * [Bug 3675] ntpq ccmds[] stores pointer to non-persistent storage
110 * [Bug 3674] ntpq command 'execute only' using '~' prefix <perlinger@ntp.org>
111 - idea+patch by Gerry Garvey
112 * [Bug 3672] fix biased selection in median cut <perlinger@ntp.org>
113 * [Bug 3666] avoid unlimited receive buffer allocation <perlinger@ntp.org>
114 - follow-up: fix inverted sense in check, reset shortfall counter
115 * [Bug 3660] Revert 4.2.8p15 change to manycast. <hart@ntp.org>
116 * [Bug 3640] document "discard monitor" and fix the code. <hart@ntp.org>
117 - fixed bug identified by Edward McGuire <perlinger@ntp.org>
118 * [Bug 3626] (SNTP) UTC offset calculation needs dst flag <perlinger@ntp.org>
119 - applied patch by Gerry Garvey
120 * [Bug 3432] refclocks that 'write()' should check the result <perlinger@ntp.org>
121 - backport from -dev, plus some more work on warnings for unchecked results
122 * [Bug 3428] ntpd spinning consuming CPU on Linux router with full table.
123 Reported by Israel G. Lugo. <hart@ntp.org>
124 * [Bug 3103] libopts zsave_warn format string too few arguments <bkorb@gnu.org>
125 * [Bug 2990] multicastclient incorrectly causes bind to broadcast address.
126 Integrated patch from Brian Utterback. <hart@ntp.org>
127 * [Bug 2525] Turn on automake subdir-objects across the project. <hart@ntp.org>
128 * [Bug 2410] syslog an error message on panic exceeded. <brian.utterback@oracle.com>
129 * Use correct rounding in mstolfp(). perlinger/hart
130 * M_ADDF should use u_int32. <hart@ntp.org>
131 * Only define tv_fmt_libbuf() if we will use it. <stenn@ntp.org>
132 * Use recv_buffer instead of the longer recv_space.X_recv_buffer. hart/stenn
133 * Make sure the value returned by refid_str() prints cleanly. <stenn@ntp.org>
134 * If DEBUG is enabled, the startup banner now says that debug assertions
135 are in force and that ntpd will abort if any are violated. <stenn@ntp.org>
136 * syslog valid incoming KoDs. <stenn@ntp.org>
137 * Rename a poorly-named variable. <stenn@ntp.org>
138 * Disable "embedded NUL in string" messages in libopts, when we can. <stenn@>
139 * Use https in the AC_INIT URLs in configure.ac. <stenn@ntp.org>
140 * Implement NTP_FUNC_REALPATH. <stenn@ntp.org>
141 * Lose a gmake construct in ntpd/Makefile.am. <stenn@ntp.org>
142 * upgrade to: autogen-5.18.16
143 * upgrade to: libopts-42.1.17
144 * upgrade to: autoconf-2.71
145 * upgrade to: automake-1.16.15
146 * Upgrade to libevent-2.1.12-stable <stenn@ntp.org>
147 * Support OpenSSL-3.0
150 NTP 4.2.8p15 (Harlan Stenn <stenn@ntp.org>, 2020 Jun 23)
152 Focus: Security, Bug fixes
156 This release fixes one vulnerability: Associations that use CMAC
157 authentication between ntpd from versions 4.2.8p11/4.3.97 and
158 4.2.8p14/4.3.100 will leak a small amount of memory for each packet.
159 Eventually, ntpd will run out of memory and abort.
161 It also fixes 13 other bugs.
163 * [Sec 3661] memory leak with AES128CMAC keys <perlinger@ntp.org>
164 * [Bug 3670] Regression from bad merger between 3592 and 3596 <perlinger@>
165 - Thanks to Sylar Tao
166 * [Bug 3667] decodenetnum fails with numeric port <perlinger@ntp.org>
167 - rewrite 'decodenetnum()' in terms of inet_pton
168 * [Bug 3666] avoid unlimited receive buffer allocation <perlinger@ntp.org>
169 - limit number of receive buffers, with an iron reserve for refclocks
170 * [Bug 3664] Enable openSSL CMAC support on Windows <burnicki@ntp.org>
171 * [Bug 3662] Fix build errors on Windows with VS2008 <burnicki@ntp.org>
172 * [Bug 3660] Manycast orphan mode startup discovery problem. <stenn@ntp.org>
173 - integrated patch from Charles Claggett
174 * [Bug 3659] Move definition of psl[] from ntp_config.h to
175 ntp_config.h <perlinger@ntp.org>
176 * [Bug 3657] Wrong "Autokey group mismatch" debug message <perlinger@ntp.org>
177 * [Bug 3655] ntpdc memstats hash counts <perlinger@ntp.org>
178 - fix by Gerry garvey
179 * [Bug 3653] Refclock jitter RMS calculation <perlinger@ntp.org>
180 - thanks to Gerry Garvey
181 * [Bug 3646] Avoid sync with unsync orphan <perlinger@ntp.org>
182 - patch by Gerry Garvey
183 * [Bug 3644] Unsynchronized server [...] selected as candidate <perlinger@ntp.org>
184 * [Bug 3639] refclock_jjy: TS-JJY0x can skip time sync depending on the STUS reply. <abe@ntp.org>
185 - applied patch by Takao Abe
188 NTP 4.2.8p14 (Harlan Stenn <stenn@ntp.org>, 2020 Mar 03)
190 Focus: Security, Bug fixes, enhancements.
194 This release fixes three vulnerabilities: a bug that causes causes an ntpd
195 instance that is explicitly configured to override the default and allow
196 ntpdc (mode 7) connections to be made to a server to read some uninitialized
197 memory; fixes the case where an unmonitored ntpd using an unauthenticated
198 association to its servers may be susceptible to a forged packet DoS attack;
199 and fixes an attack against a client instance that uses a single
200 unauthenticated time source. It also fixes 46 other bugs and addresses
203 * [Sec 3610] process_control() should bail earlier on short packets. stenn@
204 - Reported by Philippe Antoine
205 * [Sec 3596] Highly predictable timestamp attack. <stenn@ntp.org>
206 - Reported by Miroslav Lichvar
207 * [Sec 3592] DoS attack on client ntpd <perlinger@ntp.org>
208 - Reported by Miroslav Lichvar
209 * [Bug 3637] Emit the version of ntpd in saveconfig. stenn@
210 * [Bug 3636] NMEA: combine time/date from multiple sentences <perlinger@ntp.org>
211 * [Bug 3635] Make leapsecond file hash check optional <perlinger@ntp.org>
212 * [Bug 3634] Typo in discipline.html, reported by Jason Harrison. stenn@
213 * [Bug 3628] raw DCF decoding - improve robustness with Zeller's congruence
214 - implement Zeller's congruence in libparse and libntp <perlinger@ntp.org>
215 * [Bug 3627] SIGSEGV on FreeBSD-12 with stack limit and stack gap <perlinger@ntp.org>
216 - integrated patch by Cy Schubert
217 * [Bug 3620] memory leak in ntpq sysinfo <perlinger@ntp.org>
218 - applied patch by Gerry Garvey
219 * [Bug 3619] Honour drefid setting in cooked mode and sysinfo <perlinger@ntp.org>
220 - applied patch by Gerry Garvey
221 * [Bug 3617] Add support for ACE III and Copernicus II receivers <perlinger@ntp.org>
222 - integrated patch by Richard Steedman
223 * [Bug 3615] accelerate refclock startup <perlinger@ntp.org>
224 * [Bug 3613] Propagate noselect to mobilized pool servers <stenn@ntp.org>
225 - Reported by Martin Burnicki
226 * [Bug 3612] Use-of-uninitialized-value in receive function <perlinger@ntp.org>
227 - Reported by Philippe Antoine
228 * [Bug 3611] NMEA time interpreted incorrectly <perlinger@ntp.org>
229 - officially document new "trust date" mode bit for NMEA driver
230 - restore the (previously undocumented) "trust date" feature lost with [bug 3577]
231 * [Bug 3609] Fixing wrong falseticker in case of non-statistic jitter <perlinger@ntp.org>
232 - mostly based on a patch by Michael Haardt, implementing 'fudge minjitter'
233 * [Bug 3608] libparse fails to compile on S11.4SRU13 and later <perlinger@ntp.org>
234 - removed ffs() and fls() prototypes as per Brian Utterback
235 * [Bug 3604] Wrong param byte order passing into record_raw_stats() in
236 ntp_io.c <perlinger@ntp.org>
237 - fixed byte and paramter order as suggested by wei6410@sina.com
238 * [Bug 3601] Tests fail to link on platforms with ntp_cv_gc_sections_runs=no <perlinger@ntp.org>
239 * [Bug 3599] Build fails on linux-m68k due to alignment issues <perlinger@ntp.org>
240 - added padding as suggested by John Paul Adrian Glaubitz
241 * [Bug 3594] ntpd discards messages coming through nmead <perlinger@ntp.org>
242 * [Bug 3593] ntpd discards silently nmea messages after the 5th string <perlinger@ntp.org>
243 * [Bug 3590] Update refclock_oncore.c to the new GPS date API <perlinger@ntp.org>
244 * [Bug 3585] Unity tests mix buffered and unbuffered output <perlinger@ntp.org>
245 - stdout+stderr are set to line buffered during test setup now
246 * [Bug 3583] synchronization error <perlinger@ntp.org>
247 - set clock to base date if system time is before that limit
248 * [Bug 3582] gpsdjson refclock fudgetime1 adjustment is doubled <perlinger@ntp.org>
249 * [Bug 3580] Possible bug ntpq-subs (NULL dereference in dogetassoc) <perlinger@ntp.org>
250 - Reported by Paulo Neves
251 * [Bug 3577] Update refclock_zyfer.c to the new GPS date API <perlinger@ntp.org>
252 - also updates for refclock_nmea.c and refclock_jupiter.c
253 * [Bug 3576] New GPS date function API <perlinger@ntp.org>
254 * [Bug 3573] nptdate: missleading error message <perlinger@ntp.org>
255 * [Bug 3570] NMEA driver docs: talker ID not mentioned, typo <perlinger@ntp.org>
256 * [Bug 3569] cleanup MOD_NANO/STA_NANO handling for 'ntpadjtimex()' <perlinger@ntp.org>
257 - sidekick: service port resolution in 'ntpdate'
258 * [Bug 3550] Reproducible build: Respect SOURCE_DATE_EPOCH <perlinger@ntp.org>
259 - applied patch by Douglas Royds
260 * [Bug 3542] ntpdc monlist parameters cannot be set <perlinger@ntp.org>
261 * [Bug 3533] ntpdc peer_info ipv6 issues <perlinger@ntp.org>
262 - applied patch by Gerry Garvey
263 * [Bug 3531] make check: test-decodenetnum fails <perlinger@ntp.org>
264 - try to harden 'decodenetnum()' against 'getaddrinfo()' errors
265 - fix wrong cond-compile tests in unit tests
266 * [Bug 3517] Reducing build noise <perlinger@ntp.org>
267 * [Bug 3516] Require tooling from this decade <perlinger@ntp.org>
268 - patch by Philipp Prindeville
269 * [Bug 3515] Refactor ntpdmain() dispatcher loop and group common code <perlinger@ntp.org>
270 - patch by Philipp Prindeville
271 * [Bug 3511] Get rid of AC_LANG_SOURCE() warnings <perlinger@ntp.org>
272 - patch by Philipp Prindeville
273 * [Bug 3510] Flatten out the #ifdef nesting in ntpdmain() <perlinger@ntp.org>
274 - partial application of patch by Philipp Prindeville
275 * [Bug 3491] Signed values of LFP datatypes should always display a sign
276 - applied patch by Gerry Garvey & fixed unit tests <perlinger@ntp.org>
277 * [Bug 3490] Patch to support Trimble Resolution Receivers <perlinger@ntp.org>
278 - applied (modified) patch by Richard Steedman
279 * [Bug 3473] RefID of refclocks should always be text format <perlinger@ntp.org>
280 - applied patch by Gerry Garvey (with minor formatting changes)
281 * [Bug 3132] Building 4.2.8p8 with disabled local libopts fails <perlinger@ntp.org>
282 - applied patch by Miroslav Lichvar
283 * [Bug 3094] ntpd trying to listen for broadcasts on a completely ipv6 network
285 * [Bug 2420] ntpd doesn't run and exits with retval 0 when invalid user
286 is specified with -u <perlinger@ntp.org>
287 - monitor daemon child startup & propagate exit codes
288 * [Bug 1433] runtime check whether the kernel really supports capabilities
289 - (modified) patch by Kurt Roeckx <perlinger@ntp.org>
290 * Clean up sntp/networking.c:sendpkt() error message. <stenn@ntp.org>
291 * Provide more detail on unrecognized config file parser tokens. <stenn@ntp.org>
292 * Startup log improvements. <stenn@ntp.org>
293 * Update the copyright year.
296 NTP 4.2.8p13 (Harlan Stenn <stenn@ntp.org>, 2019 Mar 07)
298 Focus: Security, Bug fixes, enhancements.
302 This release fixes a bug that allows an attacker with access to an
303 explicitly trusted source to send a crafted malicious mode 6 (ntpq)
304 packet that can trigger a NULL pointer dereference, crashing ntpd.
305 It also provides 17 other bugfixes and 1 other improvement:
307 * [Sec 3565] Crafted null dereference attack in authenticated
308 mode 6 packet <perlinger@ntp.org>
309 - reported by Magnus Stubman
310 * [Bug 3560] Fix build when HAVE_DROPROOT is not defined <perlinger@ntp.org>
311 - applied patch by Ian Lepore
312 * [Bug 3558] Crash and integer size bug <perlinger@ntp.org>
313 - isolate and fix linux/windows specific code issue
314 * [Bug 3556] ntp_loopfilter.c snprintf compilation warnings <perlinger@ntp.org>
315 - provide better function for incremental string formatting
316 * [Bug 3555] Tidy up print alignment of debug output from ntpdate <perlinger@ntp.org>
317 - applied patch by Gerry Garvey
318 * [Bug 3554] config revoke stores incorrect value <perlinger@ntp.org>
319 - original finding by Gerry Garvey, additional cleanup needed
320 * [Bug 3549] Spurious initgroups() error message <perlinger@ntp.org>
321 - patch by Christous Zoulas
322 * [Bug 3548] Signature not verified on windows system <perlinger@ntp.org>
323 - finding by Chen Jiabin, plus another one by me
324 * [Bug 3541] patch to fix STA_NANO struct timex units <perlinger@ntp.org>
325 - applied patch by Maciej Szmigiero
326 * [Bug 3540] Cannot set minsane to 0 anymore <perlinger@ntp.org>
327 - applied patch by Andre Charbonneau
328 * [Bug 3539] work_fork build fails when droproot is not supported <perlinger@ntp.org>
329 - applied patch by Baruch Siach
330 * [Bug 3538] Build fails for no-MMU targets <perlinger@ntp.org>
331 - applied patch by Baruch Siach
332 * [Bug 3535] libparse won't handle GPS week rollover <perlinger@ntp.org>
333 - refactored handling of GPS era based on 'tos basedate' for
334 parse (TSIP) and JUPITER clocks
335 * [Bug 3529] Build failures on Mac OS X 10.13 (High Sierra) <perlinger@ntp.org>
336 - patch by Daniel J. Luke; this does not fix a potential linker
337 regression issue on MacOS.
338 * [Bug 3527 - Backward Incompatible] mode7 clockinfo fudgeval2 packet
339 anomaly <perlinger@ntp.org>, reported by GGarvey.
340 - --enable-bug3527-fix support by HStenn
341 * [Bug 3526] Incorrect poll interval in packet <perlinger@ntp.org>
342 - applied patch by Gerry Garvey
343 * [Bug 3471] Check for openssl/[ch]mac.h. <perlinger@ntp.org>
344 - added missing check, reported by Reinhard Max <perlinger@ntp.org>
345 * [Bug 1674] runtime crashes and sync problems affecting both x86 and x86_64
346 - this is a variant of [bug 3558] and should be fixed with it
347 * Implement 'configure --disable-signalled-io'
350 NTP 4.2.8p12 (Harlan Stenn <stenn@ntp.org>, 2018/14/09)
352 Focus: Security, Bug fixes, enhancements.
356 This release fixes a "hole" in the noepeer capability introduced to ntpd
357 in ntp-4.2.8p11, and a buffer overflow in the openhost() function used by
358 ntpq and ntpdc. It also provides 26 other bugfixes, and 4 other improvements:
360 * [Sec 3505] Buffer overflow in the openhost() call of ntpq and ntpdc.
362 * [Sec 3012] Fix a hole in the new "noepeer" processing.
365 [Bug 3521] Fix a logic bug in the INVALIDNAK checks. <stenn@ntp.org>
366 [Bug 3509] Add support for running as non-root on FreeBSD, Darwin,
367 other TrustedBSD platforms
368 - applied patch by Ian Lepore <perlinger@ntp.org>
369 [Bug 3506] Service Control Manager interacts poorly with NTPD <perlinger@ntp.org>
370 - changed interaction with SCM to signal pending startup
371 [Bug 3486] Buffer overflow in ntpq/ntpq.c:tstflags() <perlinger@ntp.org>
372 - applied patch by Gerry Garvey
373 [Bug 3485] Undefined sockaddr used in error messages in ntp_config.c <perlinger@ntp.org>
374 - applied patch by Gerry Garvey
375 [Bug 3484] ntpq response from ntpd is incorrect when REFID is null <perlinger@ntp.org>
376 - rework of ntpq 'nextvar()' key/value parsing
377 [Bug 3482] Fixes for compilation warnings (ntp_io.c & ntpq-subs.c) <perlinger@ntp.org>
378 - applied patch by Gerry Garvey (with mods)
379 [Bug 3480] Refclock sample filter not cleared on clock STEP <perlinger@ntp.org>
380 - applied patch by Gerry Garvey
381 [Bug 3479] ctl_putrefid() allows unsafe characters through to ntpq <perlinger@ntp.org>
382 - applied patch by Gerry Garvey (with mods)
383 [Bug 3476]ctl_putstr() sends empty unquoted string [...] <perlinger@ntp.org>
384 - applied patch by Gerry Garvey (with mods); not sure if that's bug or feature, though
385 [Bug 3475] modify prettydate() to suppress output of zero time <perlinger@ntp.org>
386 - applied patch by Gerry Garvey
387 [Bug 3474] Missing pmode in mode7 peer info response <perlinger@ntp.org>
388 - applied patch by Gerry Garvey
389 [Bug 3471] Check for openssl/[ch]mac.h. HStenn.
390 - add #define ENABLE_CMAC support in configure. HStenn.
391 [Bug 3470] ntpd4.2.8p11 fails to compile without OpenSSL <perlinger@ntp.org>
392 [Bug 3469] Incomplete string compare [...] in is_refclk_addr <perlinger@ntp.org>
393 - patch by Stephen Friedl
394 [Bug 3467] Potential memory fault in ntpq [...] <perlinger@ntp.org>
395 - fixed IO redirection and CTRL-C handling in ntq and ntpdc
396 [Bug 3465] Default TTL values cannot be used <perlinger@ntp.org>
397 [Bug 3461] refclock_shm.c: clear error status on clock recovery <perlinger@ntp.org>
398 - initial patch by Hal Murray; also fixed refclock_report() trouble
399 [Bug 3460] Fix typo in ntpq.texi, reported by Kenyon Ralph. <stenn@ntp.org>
400 [Bug 3456] Use uintptr_t rather than size_t to store an integer in a pointer
401 - According to Brooks Davis, there was only one location <perlinger@ntp.org>
402 [Bug 3449] ntpq - display "loop" instead of refid [...] <perlinger@ntp.org>
403 - applied patch by Gerry Garvey
404 [Bug 3445] Symmetric peer won't sync on startup <perlinger@ntp.org>
405 - applied patch by Gerry Garvey
406 [Bug 3442] Fixes for ntpdate as suggested by Gerry Garvey,
408 New macro REFID_ISTEXT() which is also used in ntpd/ntp_control.c.
409 [Bug 3434] ntpd clears STA_UNSYNC on start <perlinger@ntp.org>
410 - applied patch by Miroslav Lichvar
411 [Bug 3426] ntpdate.html -t default is 2 seconds. Leonid Evdokimov.
412 [Bug 3121] Drop root privileges for the forked DNS worker <perlinger@ntp.org>
413 - integrated patch by Reinhard Max
414 [Bug 2821] minor build issues <perlinger@ntp.org>
415 - applied patches by Christos Zoulas, including real bug fixes
416 html/authopt.html: cleanup, from <stenn@ntp.org>
417 ntpd/ntpd.c: DROPROOT cleanup. <stenn@ntp.org>
418 Symmetric key range is 1-65535. Update docs. <stenn@ntp.org>
421 NTP 4.2.8p11 (Harlan Stenn <stenn@ntp.org>, 2018/02/27)
423 Focus: Security, Bug fixes, enhancements.
427 This release fixes 2 low-/medium-, 1 informational/medum-, and 2 low-severity
428 vulnerabilities in ntpd, one medium-severity vulernability in ntpq, and
429 provides 65 other non-security fixes and improvements:
431 * NTP Bug 3454: Unauthenticated packet can reset authenticated interleaved
432 association (LOW/MED)
433 Date Resolved: Stable (4.2.8p11) 27 Feb 2018
434 References: Sec 3454 / CVE-2018-7185 / VU#961909
435 Affects: ntp-4.2.6, up to but not including ntp-4.2.8p11.
436 CVSS2: MED 4.3 (AV:N/AC:M/Au:N/C:N/I:N/A:P) This could score between
438 CVSS3: LOW 3.1 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L This could
439 score between 2.6 and 3.1
441 The NTP Protocol allows for both non-authenticated and
442 authenticated associations, in client/server, symmetric (peer),
443 and several broadcast modes. In addition to the basic NTP
444 operational modes, symmetric mode and broadcast servers can
445 support an interleaved mode of operation. In ntp-4.2.8p4 a bug
446 was inadvertently introduced into the protocol engine that
447 allows a non-authenticated zero-origin (reset) packet to reset
448 an authenticated interleaved peer association. If an attacker
449 can send a packet with a zero-origin timestamp and the source
450 IP address of the "other side" of an interleaved association,
451 the 'victim' ntpd will reset its association. The attacker must
452 continue sending these packets in order to maintain the
453 disruption of the association. In ntp-4.0.0 thru ntp-4.2.8p6,
454 interleave mode could be entered dynamically. As of ntp-4.2.8p7,
455 interleaved mode must be explicitly configured/enabled.
458 Upgrade to 4.2.8p11, or later, from the NTP Project Download Page
459 or the NTP Public Services Project Download Page.
460 If you are unable to upgrade to 4.2.8p11 or later and have
461 'peer HOST xleave' lines in your ntp.conf file, remove the
463 Have enough sources of time.
464 Properly monitor your ntpd instances.
465 If ntpd stops running, auto-restart it without -g .
467 This weakness was discovered by Miroslav Lichvar of Red Hat.
469 * NTP Bug 3453: Interleaved symmetric mode cannot recover from bad
471 Date Resolved: Stable (4.2.8p11) 27 Feb 2018
472 References: Sec 3453 / CVE-2018-7184 / VU#961909
473 Affects: ntpd in ntp-4.2.8p4, up to but not including ntp-4.2.8p11.
474 CVSS2: MED 4.3 (AV:N/AC:M/Au:N/C:P/I:N/A:N)
475 Could score between 2.9 and 6.8.
476 CVSS3: LOW 3.1 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
477 Could score between 2.6 and 6.0.
479 The fix for NtpBug2952 was incomplete, and while it fixed one
480 problem it created another. Specifically, it drops bad packets
481 before updating the "received" timestamp. This means a
482 third-party can inject a packet with a zero-origin timestamp,
483 meaning the sender wants to reset the association, and the
484 transmit timestamp in this bogus packet will be saved as the
485 most recent "received" timestamp. The real remote peer does
486 not know this value and this will disrupt the association until
487 the association resets.
490 Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
491 or the NTP Public Services Project Download Page.
492 Use authentication with 'peer' mode.
493 Have enough sources of time.
494 Properly monitor your ntpd instances.
495 If ntpd stops running, auto-restart it without -g .
497 This weakness was discovered by Miroslav Lichvar of Red Hat.
499 * NTP Bug 3415: Provide a way to prevent authenticated symmetric passive
501 Date Resolved: Stable (4.2.8p11) 27 Feb 2018
502 References: Sec 3415 / CVE-2018-7170 / VU#961909
503 Sec 3012 / CVE-2016-1549 / VU#718152
504 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
505 4.3.0 up to, but not including 4.3.92. Resolved in 4.2.8p11.
506 CVSS2: LOW 3.5 - (AV:N/AC:M/Au:S/C:N/I:P/A:N)
507 CVSS3: LOW 3.1 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
509 ntpd can be vulnerable to Sybil attacks. If a system is set up to
510 use a trustedkey and if one is not using the feature introduced in
511 ntp-4.2.8p6 allowing an optional 4th field in the ntp.keys file to
512 specify which IPs can serve time, a malicious authenticated peer
513 -- i.e. one where the attacker knows the private symmetric key --
514 can create arbitrarily-many ephemeral associations in order to win
515 the clock selection of ntpd and modify a victim's clock. Three
516 additional protections are offered in ntp-4.2.8p11. One is the
517 new 'noepeer' directive, which disables symmetric passive
518 ephemeral peering. Another is the new 'ippeerlimit' directive,
519 which limits the number of peers that can be created from an IP.
520 The third extends the functionality of the 4th field in the
521 ntp.keys file to include specifying a subnet range.
524 Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
525 or the NTP Public Services Project Download Page.
526 Use the 'noepeer' directive to prohibit symmetric passive
527 ephemeral associations.
528 Use the 'ippeerlimit' directive to limit the number of peers
529 that can be created from an IP.
530 Use the 4th argument in the ntp.keys file to limit the IPs and
531 subnets that can be time servers.
532 Have enough sources of time.
533 Properly monitor your ntpd instances.
534 If ntpd stops running, auto-restart it without -g .
536 This weakness was reported as Bug 3012 by Matthew Van Gundy of
537 Cisco ASIG, and separately by Stefan Moser as Bug 3415.
539 * ntpq Bug 3414: decodearr() can write beyond its 'buf' limits (Medium)
540 Date Resolved: 27 Feb 2018
541 References: Sec 3414 / CVE-2018-7183 / VU#961909
542 Affects: ntpq in ntp-4.2.8p6, up to but not including ntp-4.2.8p11.
543 CVSS2: MED 6.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)
544 CVSS3: MED 5.0 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
546 ntpq is a monitoring and control program for ntpd. decodearr()
547 is an internal function of ntpq that is used to -- wait for it --
548 decode an array in a response string when formatted data is being
549 displayed. This is a problem in affected versions of ntpq if a
550 maliciously-altered ntpd returns an array result that will trip this
551 bug, or if a bad actor is able to read an ntpq request on its way to
552 a remote ntpd server and forge and send a response before the remote
553 ntpd sends its response. It's potentially possible that the
554 malicious data could become injectable/executable code.
557 Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
558 or the NTP Public Services Project Download Page.
560 This weakness was discovered by Michael Macnair of Thales e-Security.
562 * NTP Bug 3412: ctl_getitem(): buffer read overrun leads to undefined
563 behavior and information leak (Info/Medium)
564 Date Resolved: 27 Feb 2018
565 References: Sec 3412 / CVE-2018-7182 / VU#961909
566 Affects: ntp-4.2.8p6, up to but not including ntp-4.2.8p11.
567 CVSS2: INFO 0.0 - MED 5.0 (AV:N/AC:L/Au:N/C:P/I:N/A:N) 0.0 if C:N
568 CVSS3: NONE 0.0 - MED 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
571 ctl_getitem() is used by ntpd to process incoming mode 6 packets.
572 A malicious mode 6 packet can be sent to an ntpd instance, and
573 if the ntpd instance is from 4.2.8p6 thru 4.2.8p10, that will
574 cause ctl_getitem() to read past the end of its buffer.
577 Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
578 or the NTP Public Services Project Download Page.
579 Have enough sources of time.
580 Properly monitor your ntpd instances.
581 If ntpd stops running, auto-restart it without -g .
583 This weakness was discovered by Yihan Lian of Qihoo 360.
585 * NTP Bug 3012: Sybil vulnerability: ephemeral association attack
586 Also see Bug 3415, above.
587 Date Mitigated: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
588 Date Resolved: Stable (4.2.8p11) 27 Feb 2018
589 References: Sec 3012 / CVE-2016-1549 / VU#718152
590 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
591 4.3.0 up to, but not including 4.3.92. Resolved in 4.2.8p11.
592 CVSS2: LOW 3.5 - (AV:N/AC:M/Au:S/C:N/I:P/A:N)
593 CVSS3: MED 5.3 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
595 ntpd can be vulnerable to Sybil attacks. If a system is set up
596 to use a trustedkey and if one is not using the feature
597 introduced in ntp-4.2.8p6 allowing an optional 4th field in the
598 ntp.keys file to specify which IPs can serve time, a malicious
599 authenticated peer -- i.e. one where the attacker knows the
600 private symmetric key -- can create arbitrarily-many ephemeral
601 associations in order to win the clock selection of ntpd and
602 modify a victim's clock. Two additional protections are
603 offered in ntp-4.2.8p11. One is the 'noepeer' directive, which
604 disables symmetric passive ephemeral peering. The other extends
605 the functionality of the 4th field in the ntp.keys file to
606 include specifying a subnet range.
609 Upgrade to 4.2.8p11, or later, from the NTP Project Download Page or
610 the NTP Public Services Project Download Page.
611 Use the 'noepeer' directive to prohibit symmetric passive
612 ephemeral associations.
613 Use the 'ippeerlimit' directive to limit the number of peer
614 associations from an IP.
615 Use the 4th argument in the ntp.keys file to limit the IPs
616 and subnets that can be time servers.
617 Properly monitor your ntpd instances.
619 This weakness was discovered by Matthew Van Gundy of Cisco ASIG.
622 [Bug 3457] OpenSSL FIPS mode regression <perlinger@ntp.org>
623 [Bug 3455] ntpd doesn't use scope id when binding multicast <perlinger@ntp.org>
624 - applied patch by Sean Haugh
625 [Bug 3452] PARSE driver prints uninitialized memory. <perlinger@ntp.org>
626 [Bug 3450] Dubious error messages from plausibility checks in get_systime()
627 - removed error log caused by rounding/slew, ensured postcondition <perlinger@ntp.org>
628 [Bug 3447] AES-128-CMAC (fixes) <perlinger@ntp.org>
629 - refactoring the MAC code, too
630 [Bug 3441] Validate the assumption that AF_UNSPEC is 0. stenn@ntp.org
631 [Bug 3439] When running multiple commands / hosts in ntpq... <perlinger@ntp.org>
632 - applied patch by ggarvey
633 [Bug 3438] Negative values and values > 999 days in... <perlinger@ntp.org>
634 - applied patch by ggarvey (with minor mods)
635 [Bug 3437] ntpd tries to open socket with AF_UNSPEC domain
636 - applied patch (with mods) by Miroslav Lichvar <perlinger@ntp.org>
637 [Bug 3435] anchor NTP era alignment <perlinger@ntp.org>
638 [Bug 3433] sntp crashes when run with -a. <stenn@ntp.org>
639 [Bug 3430] ntpq dumps core (SIGSEGV) for "keytype md2"
640 - fixed several issues with hash algos in ntpd, sntp, ntpq,
641 ntpdc and the test suites <perlinger@ntp.org>
642 [Bug 3424] Trimble Thunderbolt 1024 week millenium bug <perlinger@ntp.org>
643 - initial patch by Daniel Pouzzner
644 [Bug 3423] QNX adjtime() implementation error checking is
645 wrong <perlinger@ntp.org>
646 [Bug 3417] ntpq ifstats packet counters can be negative
647 made IFSTATS counter quantities unsigned <perlinger@ntp.org>
648 [Bug 3411] problem about SIGN(6) packet handling for ntp-4.2.8p10
649 - raised receive buffer size to 1200 <perlinger@ntp.org>
650 [Bug 3408] refclock_jjy.c: Avoid a wrong report of the coverity static
651 analysis tool. <abe@ntp.org>
652 [Bug 3405] update-leap.in: general cleanup, HTTPS support. Paul McMath.
653 [Bug 3404] Fix openSSL DLL usage under Windows <perlinger@ntp.org>
654 - fix/drop assumptions on OpenSSL libs directory layout
655 [Bug 3399] NTP: linker error in 4.2.8p10 during Linux cross-compilation
656 - initial patch by timeflies@mail2tor.com <perlinger@ntp.org>
657 [Bug 3398] tests fail with core dump <perlinger@ntp.org>
658 - patch contributed by Alexander Bluhm
659 [Bug 3397] ctl_putstr() asserts that data fits in its buffer
660 rework of formatting & data transfer stuff in 'ntp_control.c'
661 avoids unecessary buffers and size limitations. <perlinger@ntp.org>
662 [Bug 3394] Leap second deletion does not work on ntpd clients
663 - fixed handling of dynamic deletion w/o leap file <perlinger@ntp.org>
664 [Bug 3391] ntpd segfaults on startup due to small warmup thread stack size
665 - increased mimimum stack size to 32kB <perlinger@ntp.org>
666 [Bug 3367] Faulty LinuxPPS NMEA clock support in 4.2.8 <perlinger@ntp.org>
667 - reverted handling of PPS kernel consumer to 4.2.6 behavior
668 [Bug 3365] Updates driver40(-ja).html and miscopt.html <abe@ntp.org>
669 [Bug 3358] Spurious KoD log messages in .INIT. phase. HStenn.
670 [Bug 3016] wrong error position reported for bad ":config pool"
671 - fixed location counter & ntpq output <perlinger@ntp.org>
672 [Bug 2900] libntp build order problem. HStenn.
673 [Bug 2878] Tests are cluttering up syslog <perlinger@ntp.org>
674 [Bug 2737] Wrong phone number listed for USNO. ntp-bugs@bodosom.net,
676 [Bug 2557] Fix Thunderbolt init. ntp-bugs@bodosom.net, perlinger@ntp.
677 [Bug 948] Trustedkey config directive leaks memory. <perlinger@ntp.org>
678 Use strlcpy() to copy strings, not memcpy(). HStenn.
680 test_ntp_scanner_LDADD needs ntpd/ntp_io.o. HStenn.
681 refclock_jjy.c: Add missing "%s" to an msyslog() call. HStenn.
682 Build ntpq and libntpq.a with NTP_HARD_*FLAGS. perlinger@ntp.org
683 Fix trivial warnings from 'make check'. perlinger@ntp.org
684 Fix bug in the override portion of the compiler hardening macro. HStenn.
685 record_raw_stats(): Log entire packet. Log writes. HStenn.
686 AES-128-CMAC support. BInglis, HStenn, JPerlinger.
687 sntp: tweak key file logging. HStenn.
688 sntp: pkt_output(): Improve debug output. HStenn.
689 update-leap: updates from Paul McMath.
690 When using pkg-config, report --modversion. HStenn.
691 Clean up libevent configure checks. HStenn.
692 sntp: show the IP of who sent us a crypto-NAK. HStenn.
693 Allow .../N to specify subnet bits for IPs in ntp.keys. HStenn, JPerlinger.
694 authistrustedip() - use it in more places. HStenn, JPerlinger.
695 New sysstats: sys_lamport, sys_tsrounding. HStenn.
696 Update ntp.keys .../N documentation. HStenn.
697 Distribute testconf.yml. HStenn.
698 Add DPRINTF(2,...) lines to receive() for packet drops. HStenn.
699 Rename the configuration flag fifo variables. HStenn.
700 Improve saveconfig output. HStenn.
701 Decode restrict flags on receive() debug output. HStenn.
702 Decode interface flags on receive() debug output. HStenn.
703 Warn the user if deprecated "driftfile name WanderThreshold" is used. HStenn.
704 Update the documentation in ntp.conf.def . HStenn.
705 restrictions() must return restrict flags and ippeerlimit. HStenn.
706 Update ntpq peer documentation to describe the 'p' type. HStenn.
707 Rename restrict 'flags' to 'rflags. Use an enum for the values. HStenn.
708 Provide dump_restricts() for debugging. HStenn.
709 Use consistent 4th arg type for [gs]etsockopt. JPerlinger.
713 * update-leap needs the following perl modules:
717 * New sysstats variables: sys_lamport, sys_tsrounding
718 See them with: ntpq -c "rv 0 ss_lamport,ss_tsrounding"
719 sys_lamport counts the number of observed Lamport violations, while
720 sys_tsrounding counts observed timestamp rounding events.
722 * New ntp.conf items:
724 - restrict ... noepeer
725 - restrict ... ippeerlimit N
727 The 'noepeer' directive will disallow all ephemeral/passive peer
730 The 'ippeerlimit' directive limits the number of time associations
731 for each IP in the designated set of addresses. This limit does not
732 apply to explicitly-configured associations. A value of -1, the current
733 default, means an unlimited number of associations may connect from a
734 single IP. 0 means "none", etc. Ordinarily the only way multiple
735 associations would come from the same IP would be if the remote side
736 was using a proxy. But a trusted machine might become compromised,
737 in which case an attacker might spin up multiple authenticated sessions
738 from different ports. This directive should be helpful in this case.
740 * New ntp.keys feature: Each IP in the optional list of IPs in the 4th
741 field may contain a /subnetbits specification, which identifies the
742 scope of IPs that may use this key. This IP/subnet restriction can be
743 used to limit the IPs that may use the key in most all situations where
746 NTP 4.2.8p10 (Harlan Stenn <stenn@ntp.org>, 2017/03/21)
748 Focus: Security, Bug fixes, enhancements.
752 This release fixes 5 medium-, 6 low-, and 4 informational-severity
753 vulnerabilities, and provides 15 other non-security fixes and improvements:
755 * NTP-01-016 NTP: Denial of Service via Malformed Config (Medium)
756 Date Resolved: 21 Mar 2017
757 References: Sec 3389 / CVE-2017-6464 / VU#325339
758 Affects: All versions of NTP-4, up to but not including ntp-4.2.8p10, and
759 ntp-4.3.0 up to, but not including ntp-4.3.94.
760 CVSS2: MED 4.6 (AV:N/AC:H/Au:M/C:N/I:N/A:C)
761 CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
763 A vulnerability found in the NTP server makes it possible for an
764 authenticated remote user to crash ntpd via a malformed mode
765 configuration directive.
768 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page or
769 the NTP Public Services Project Download Page
770 Properly monitor your ntpd instances, and auto-restart
771 ntpd (without -g) if it stops running.
773 This weakness was discovered by Cure53.
775 * NTP-01-014 NTP: Buffer Overflow in DPTS Clock (Low)
776 Date Resolved: 21 Mar 2017
777 References: Sec 3388 / CVE-2017-6462 / VU#325339
778 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not including ntp-4.3.94.
779 CVSS2: Low 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
780 CVSS3: Low 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
782 There is a potential for a buffer overflow in the legacy Datum
783 Programmable Time Server refclock driver. Here the packets are
784 processed from the /dev/datum device and handled in
785 datum_pts_receive(). Since an attacker would be required to
786 somehow control a malicious /dev/datum device, this does not
787 appear to be a practical attack and renders this issue "Low" in
790 If you have a Datum reference clock installed and think somebody
791 may maliciously change the device, upgrade to 4.2.8p10, or
792 later, from the NTP Project Download Page or the NTP Public
793 Services Project Download Page
794 Properly monitor your ntpd instances, and auto-restart
795 ntpd (without -g) if it stops running.
797 This weakness was discovered by Cure53.
799 * NTP-01-012 NTP: Authenticated DoS via Malicious Config Option (Medium)
800 Date Resolved: 21 Mar 2017
801 References: Sec 3387 / CVE-2017-6463 / VU#325339
802 Affects: All versions of ntp, up to but not including ntp-4.2.8p10, and
803 ntp-4.3.0 up to, but not including ntp-4.3.94.
804 CVSS2: MED 4.6 (AV:N/AC:H/Au:M/C:N/I:N/A:C)
805 CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
807 A vulnerability found in the NTP server allows an authenticated
808 remote attacker to crash the daemon by sending an invalid setting
809 via the :config directive. The unpeer option expects a number or
810 an address as an argument. In case the value is "0", a
811 segmentation fault occurs.
814 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
815 or the NTP Public Services Project Download Page
816 Properly monitor your ntpd instances, and auto-restart
817 ntpd (without -g) if it stops running.
819 This weakness was discovered by Cure53.
821 * NTP-01-011 NTP: ntpq_stripquotes() returns incorrect value (Informational)
822 Date Resolved: 21 Mar 2017
824 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
825 ntp-4.3.0 up to, but not including ntp-4.3.94.
826 CVSS2: None 0.0 (AV:N/AC:H/Au:N/C:N/I:N/A:N)
827 CVSS3: None 0.0 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:N
829 The NTP Mode 6 monitoring and control client, ntpq, uses the
830 function ntpq_stripquotes() to remove quotes and escape characters
831 from a given string. According to the documentation, the function
832 is supposed to return the number of copied bytes but due to
833 incorrect pointer usage this value is always zero. Although the
834 return value of this function is never used in the code, this
835 flaw could lead to a vulnerability in the future. Since relying
836 on wrong return values when performing memory operations is a
837 dangerous practice, it is recommended to return the correct value
838 in accordance with the documentation pertinent to the code.
841 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
842 or the NTP Public Services Project Download Page
843 Properly monitor your ntpd instances, and auto-restart
844 ntpd (without -g) if it stops running.
846 This weakness was discovered by Cure53.
848 * NTP-01-010 NTP: ereallocarray()/eallocarray() underused (Info)
849 Date Resolved: 21 Mar 2017
851 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
852 ntp-4.3.0 up to, but not including ntp-4.3.94.
854 NTP makes use of several wrappers around the standard heap memory
855 allocation functions that are provided by libc. This is mainly
856 done to introduce additional safety checks concentrated on
857 several goals. First, they seek to ensure that memory is not
858 accidentally freed, secondly they verify that a correct amount
859 is always allocated and, thirdly, that allocation failures are
860 correctly handled. There is an additional implementation for
861 scenarios where memory for a specific amount of items of the
862 same size needs to be allocated. The handling can be found in
863 the oreallocarray() function for which a further number-of-elements
864 parameter needs to be provided. Although no considerable threat
865 was identified as tied to a lack of use of this function, it is
866 recommended to correctly apply oreallocarray() as a preferred
867 option across all of the locations where it is possible.
869 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
870 or the NTP Public Services Project Download Page
872 This weakness was discovered by Cure53.
874 * NTP-01-009 NTP: Privileged execution of User Library code (WINDOWS
876 Date Resolved: 21 Mar 2017
877 References: Sec 3384 / CVE-2017-6455 / VU#325339
878 Affects: All Windows versions of ntp-4 that use the PPSAPI, up to but
879 not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not
880 including ntp-4.3.94.
881 CVSS2: MED 3.8 (AV:L/AC:H/Au:S/C:N/I:N/A:C)
882 CVSS3: MED 4.0 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
884 The Windows NT port has the added capability to preload DLLs
885 defined in the inherited global local environment variable
886 PPSAPI_DLLS. The code contained within those libraries is then
887 called from the NTPD service, usually running with elevated
888 privileges. Depending on how securely the machine is setup and
889 configured, if ntpd is configured to use the PPSAPI under Windows
890 this can easily lead to a code injection.
893 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
894 or the NTP Public Services Project Download Page
896 This weakness was discovered by Cure53.
898 * NTP-01-008 NTP: Stack Buffer Overflow from Command Line (WINDOWS
899 installer ONLY) (Low)
900 Date Resolved: 21 Mar 2017
901 References: Sec 3383 / CVE-2017-6452 / VU#325339
902 Affects: WINDOWS installer ONLY: All versions of the ntp-4 Windows
903 installer, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up
904 to, but not including ntp-4.3.94.
905 CVSS2: Low 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
906 CVSS3: Low 1.8 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
908 The Windows installer for NTP calls strcat(), blindly appending
909 the string passed to the stack buffer in the addSourceToRegistry()
910 function. The stack buffer is 70 bytes smaller than the buffer
911 in the calling main() function. Together with the initially
912 copied Registry path, the combination causes a stack buffer
913 overflow and effectively overwrites the stack frame. The
914 passed application path is actually limited to 256 bytes by the
915 operating system, but this is not sufficient to assure that the
916 affected stack buffer is consistently protected against
917 overflowing at all times.
919 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
920 or the NTP Public Services Project Download Page
922 This weakness was discovered by Cure53.
924 * NTP-01-007 NTP: Data Structure terminated insufficiently (WINDOWS
925 installer ONLY) (Low)
926 Date Resolved: 21 Mar 2017
927 References: Sec 3382 / CVE-2017-6459 / VU#325339
928 Affects: WINDOWS installer ONLY: All ntp-4 versions of the Windows
929 installer, up to but not including ntp-4.2.8p10, and ntp-4.3.0
930 up to, but not including ntp-4.3.94.
931 CVSS2: Low 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
932 CVSS3: Low 1.8 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
934 The Windows installer for NTP calls strcpy() with an argument
935 that specifically contains multiple null bytes. strcpy() only
936 copies a single terminating null character into the target
937 buffer instead of copying the required double null bytes in the
938 addKeysToRegistry() function. As a consequence, a garbage
939 registry entry can be created. The additional arsize parameter
940 is erroneously set to contain two null bytes and the following
941 call to RegSetValueEx() claims to be passing in a multi-string
942 value, though this may not be true.
944 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
945 or the NTP Public Services Project Download Page
947 This weakness was discovered by Cure53.
949 * NTP-01-006 NTP: Copious amounts of Unused Code (Informational)
952 The report says: Statically included external projects
953 potentially introduce several problems and the issue of having
954 extensive amounts of code that is "dead" in the resulting binary
955 must clearly be pointed out. The unnecessary unused code may or
956 may not contain bugs and, quite possibly, might be leveraged for
957 code-gadget-based branch-flow redirection exploits. Analogically,
958 having source trees statically included as well means a failure
959 in taking advantage of the free feature for periodical updates.
960 This solution is offered by the system's Package Manager. The
961 three libraries identified are libisc, libevent, and libopts.
963 For libisc, we already only use a portion of the original library.
964 We've found and fixed bugs in the original implementation (and
965 offered the patches to ISC), and plan to see what has changed
966 since we last upgraded the code. libisc is generally not
967 installed, and when it it we usually only see the static libisc.a
968 file installed. Until we know for sure that the bugs we've found
969 and fixed are fixed upstream, we're better off with the copy we
972 Version 1 of libevent was the only production version available
973 until recently, and we've been requiring version 2 for a long time.
974 But if the build system has at least version 2 of libevent
975 installed, we'll use the version that is installed on the system.
976 Otherwise, we provide a copy of libevent that we know works.
978 libopts is provided by GNU AutoGen, and that library and package
979 undergoes frequent API version updates. The version of autogen
980 used to generate the tables for the code must match the API
981 version in libopts. AutoGen can be ... difficult to build and
982 install, and very few developers really need it. So we have it
983 on our build and development machines, and we provide the
984 specific version of the libopts code in the distribution to make
985 sure that the proper API version of libopts is available.
987 As for the point about there being code in these libraries that
988 NTP doesn't use, OK. But other packages used these libraries as
989 well, and it is reasonable to assume that other people are paying
990 attention to security and code quality issues for the overall
991 libraries. It takes significant resources to analyze and
992 customize these libraries to only include what we need, and to
993 date we believe the cost of this effort does not justify the benefit.
995 This issue was discovered by Cure53.
997 * NTP-01-005 NTP: Off-by-one in Oncore GPS Receiver (Low)
998 Date Resolved: 21 Mar 2017
1000 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
1001 ntp-4.3.0 up to, but not including ntp-4.3.94.
1002 CVSS2: None 0.0 (AV:L/AC:H/Au:N/C:N/I:N/A:N)
1003 CVSS3: None 0.0 CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N
1005 There is a fencepost error in a "recovery branch" of the code for
1006 the Oncore GPS receiver if the communication link to the ONCORE
1007 is weak / distorted and the decoding doesn't work.
1009 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page or
1010 the NTP Public Services Project Download Page
1011 Properly monitor your ntpd instances, and auto-restart
1012 ntpd (without -g) if it stops running.
1014 This weakness was discovered by Cure53.
1016 * NTP-01-004 NTP: Potential Overflows in ctl_put() functions (Medium)
1017 Date Resolved: 21 Mar 2017
1018 References: Sec 3379 / CVE-2017-6458 / VU#325339
1019 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
1020 ntp-4.3.0 up to, but not including ntp-4.3.94.
1021 CVSS2: MED 4.6 (AV:N/AC:H/Au:M/C:N/I:N/A:C)
1022 CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1024 ntpd makes use of different wrappers around ctl_putdata() to
1025 create name/value ntpq (mode 6) response strings. For example,
1026 ctl_putstr() is usually used to send string data (variable names
1027 or string data). The formatting code was missing a length check
1028 for variable names. If somebody explicitly created any unusually
1029 long variable names in ntpd (longer than 200-512 bytes, depending
1030 on the type of variable), then if any of these variables are
1031 added to the response list it would overflow a buffer.
1034 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
1035 or the NTP Public Services Project Download Page
1036 If you don't want to upgrade, then don't setvar variable names
1037 longer than 200-512 bytes in your ntp.conf file.
1038 Properly monitor your ntpd instances, and auto-restart
1039 ntpd (without -g) if it stops running.
1041 This weakness was discovered by Cure53.
1043 * NTP-01-003 NTP: Improper use of snprintf() in mx4200_send() (Low)
1044 Date Resolved: 21 Mar 2017
1045 References: Sec 3378 / CVE-2017-6451 / VU#325339
1046 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
1047 ntp-4.3.0 up to, but not including ntp-4.3.94.
1048 CVSS2: LOW 0.8 (AV:L/AC:H/Au:M/C:N/I:N/A:P)
1049 CVSS3: LOW 1.8 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
1051 The legacy MX4200 refclock is only built if is specifically
1052 enabled, and furthermore additional code changes are required to
1053 compile and use it. But it uses the libc functions snprintf()
1054 and vsnprintf() incorrectly, which can lead to an out-of-bounds
1055 memory write due to an improper handling of the return value of
1056 snprintf()/vsnprintf(). Since the return value is used as an
1057 iterator and it can be larger than the buffer's size, it is
1058 possible for the iterator to point somewhere outside of the
1059 allocated buffer space. This results in an out-of-bound memory
1060 write. This behavior can be leveraged to overwrite a saved
1061 instruction pointer on the stack and gain control over the
1062 execution flow. During testing it was not possible to identify
1063 any malicious usage for this vulnerability. Specifically, no
1064 way for an attacker to exploit this vulnerability was ultimately
1065 unveiled. However, it has the potential to be exploited, so the
1066 code should be fixed.
1067 Mitigation, if you have a Magnavox MX4200 refclock:
1068 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
1069 or the NTP Public Services Project Download Page.
1070 Properly monitor your ntpd instances, and auto-restart
1071 ntpd (without -g) if it stops running.
1073 This weakness was discovered by Cure53.
1075 * NTP-01-002 NTP: Buffer Overflow in ntpq when fetching reslist from a
1076 malicious ntpd (Medium)
1077 Date Resolved: 21 Mar 2017
1078 References: Sec 3377 / CVE-2017-6460 / VU#325339
1079 Affects: All versions of ntpq, up to but not including ntp-4.2.8p10, and
1080 ntp-4.3.0 up to, but not including ntp-4.3.94.
1081 CVSS2: MED 4.9 (AV:N/AC:H/Au:S/C:N/I:N/A:C)
1082 CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1084 A stack buffer overflow in ntpq can be triggered by a malicious
1085 ntpd server when ntpq requests the restriction list from the server.
1086 This is due to a missing length check in the reslist() function.
1087 It occurs whenever the function parses the server's response and
1088 encounters a flagstr variable of an excessive length. The string
1089 will be copied into a fixed-size buffer, leading to an overflow on
1090 the function's stack-frame. Note well that this problem requires
1091 a malicious server, and affects ntpq, not ntpd.
1093 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
1094 or the NTP Public Services Project Download Page
1095 If you can't upgrade your version of ntpq then if you want to know
1096 the reslist of an instance of ntpd that you do not control,
1097 know that if the target ntpd is malicious that it can send back
1098 a response that intends to crash your ntpq process.
1100 This weakness was discovered by Cure53.
1102 * NTP-01-001 NTP: Makefile does not enforce Security Flags (Informational)
1103 Date Resolved: 21 Mar 2017
1104 References: Sec 3376
1105 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
1106 ntp-4.3.0 up to, but not including ntp-4.3.94.
1110 The build process for NTP has not, by default, provided compile
1111 or link flags to offer "hardened" security options. Package
1112 maintainers have always been able to provide hardening security
1113 flags for their builds. As of ntp-4.2.8p10, the NTP build
1114 system has a way to provide OS-specific hardening flags. Please
1115 note that this is still not a really great solution because it
1116 is specific to NTP builds. It's inefficient to have every
1117 package supply, track and maintain this information for every
1118 target build. It would be much better if there was a common way
1119 for OSes to provide this information in a way that arbitrary
1120 packages could benefit from it.
1123 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
1124 or the NTP Public Services Project Download Page
1125 Properly monitor your ntpd instances, and auto-restart
1126 ntpd (without -g) if it stops running.
1128 This weakness was reported by Cure53.
1130 * 0rigin DoS (Medium)
1131 Date Resolved: 21 Mar 2017
1132 References: Sec 3361 / CVE-2016-9042 / VU#325339
1133 Affects: ntp-4.2.8p9 (21 Nov 2016), up to but not including ntp-4.2.8p10
1134 CVSS2: MED 4.9 (AV:N/AC:H/Au:N/C:N/I:N/A:C) (worst case)
1135 CVSS3: MED 4.4 CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H (worst case)
1137 An exploitable denial of service vulnerability exists in the
1138 origin timestamp check functionality of ntpd 4.2.8p9. A specially
1139 crafted unauthenticated network packet can be used to reset the
1140 expected origin timestamp for target peers. Legitimate replies
1141 from targeted peers will fail the origin timestamp check (TEST2)
1142 causing the reply to be dropped and creating a denial of service
1143 condition. This vulnerability can only be exploited if the
1144 attacker can spoof all of the servers.
1147 Configure enough servers/peers that an attacker cannot target
1148 all of your time sources.
1149 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
1150 or the NTP Public Services Project Download Page
1151 Properly monitor your ntpd instances, and auto-restart
1152 ntpd (without -g) if it stops running.
1154 This weakness was discovered by Matthew Van Gundy of Cisco.
1158 * [Bug 3393] clang scan-build findings <perlinger@ntp.org>
1159 * [Bug 3363] Support for openssl-1.1.0 without compatibility modes
1160 - rework of patch set from <ntp.org@eroen.eu>. <perlinger@ntp.org>
1161 * [Bug 3356] Bugfix 3072 breaks multicastclient <perlinger@ntp.org>
1162 * [Bug 3216] libntp audio ioctl() args incorrectly cast to int
1163 on 4.4BSD-Lite derived platforms <perlinger@ntp.org>
1164 - original patch by Majdi S. Abbas
1165 * [Bug 3215] 'make distcheck' fails with new BK repo format <perlinger@ntp.org>
1166 * [Bug 3173] forking async worker: interrupted pipe I/O <perlinger@ntp.org>
1167 - initial patch by Christos Zoulas
1168 * [Bug 3139] (...) time_pps_create: Exec format error <perlinger@ntp.org>
1169 - move loader API from 'inline' to proper source
1170 - augment pathless dlls with absolute path to NTPD
1171 - use 'msyslog()' instead of 'printf() 'for reporting trouble
1172 * [Bug 3107] Incorrect Logic for Peer Event Limiting <perlinger@ntp.org>
1173 - applied patch by Matthew Van Gundy
1174 * [Bug 3065] Quiet warnings on NetBSD <perlinger@ntp.org>
1175 - applied some of the patches provided by Havard. Not all of them
1176 still match the current code base, and I did not touch libopt.
1177 * [Bug 3062] Change the process name of forked DNS worker <perlinger@ntp.org>
1178 - applied patch by Reinhard Max. See bugzilla for limitations.
1179 * [Bug 2923] Trap Configuration Fail <perlinger@ntp.org>
1180 - fixed dependency inversion from [Bug 2837]
1181 * [Bug 2896] Nothing happens if minsane < maxclock < minclock
1182 - produce ERROR log message about dysfunctional daemon. <perlinger@ntp.org>
1183 * [Bug 2851] allow -4/-6 on restrict line with mask <perlinger@ntp.org>
1184 - applied patch by Miroslav Lichvar for ntp4.2.6 compat
1185 * [Bug 2645] out-of-bound pointers in ctl_putsys and decode_bitflags
1186 - Fixed these and some more locations of this pattern.
1187 Probably din't get them all, though. <perlinger@ntp.org>
1188 * Update copyright year.
1191 (4.2.8p9-win) 2017/02/01 Released by Harlan Stenn <stenn@ntp.org>
1193 * [Bug 3144] NTP does not build without openSSL. <perlinger@ntp.org>
1194 - added missed changeset for automatic openssl lib detection
1195 - fixed some minor warning issues
1196 * [Bug 3095] More compatibility with openssl 1.1. <perlinger@ntp.org>
1197 * configure.ac cleanup. stenn@ntp.org
1198 * openssl configure cleanup. stenn@ntp.org
1201 NTP 4.2.8p9 (Harlan Stenn <stenn@ntp.org>, 2016/11/21)
1203 Focus: Security, Bug fixes, enhancements.
1207 In addition to bug fixes and enhancements, this release fixes the
1208 following 1 high- (Windows only), 2 medium-, 2 medium-/low, and
1209 5 low-severity vulnerabilities, and provides 28 other non-security
1210 fixes and improvements:
1213 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1214 References: Sec 3119 / CVE-2016-9311 / VU#633847
1215 Affects: ntp-4.0.90 (21 July 1999), possibly earlier, up to but not
1216 including 4.2.8p9, and ntp-4.3.0 up to but not including ntp-4.3.94.
1217 CVSS2: MED 4.9 (AV:N/AC:H/Au:N/C:N/I:N/A:C)
1218 CVSS3: MED 4.4 CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
1220 ntpd does not enable trap service by default. If trap service
1221 has been explicitly enabled, an attacker can send a specially
1222 crafted packet to cause a null pointer dereference that will
1223 crash ntpd, resulting in a denial of service.
1226 Use "restrict default noquery ..." in your ntp.conf file. Only
1227 allow mode 6 queries from trusted networks and hosts.
1228 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1229 or the NTP Public Services Project Download Page
1230 Properly monitor your ntpd instances, and auto-restart ntpd
1231 (without -g) if it stops running.
1232 Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
1234 * Mode 6 information disclosure and DDoS vector
1235 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1236 References: Sec 3118 / CVE-2016-9310 / VU#633847
1237 Affects: ntp-4.0.90 (21 July 1999), possibly earlier, up to but not
1238 including 4.2.8p9, and ntp-4.3.0 up to but not including ntp-4.3.94.
1239 CVSS2: MED 6.4 (AV:A/AC:L/Au:N/C:N/I:N/A:P)
1240 CVSS3: MED 6.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
1242 An exploitable configuration modification vulnerability exists
1243 in the control mode (mode 6) functionality of ntpd. If, against
1244 long-standing BCP recommendations, "restrict default noquery ..."
1245 is not specified, a specially crafted control mode packet can set
1246 ntpd traps, providing information disclosure and DDoS
1247 amplification, and unset ntpd traps, disabling legitimate
1248 monitoring. A remote, unauthenticated, network attacker can
1249 trigger this vulnerability.
1252 Use "restrict default noquery ..." in your ntp.conf file.
1253 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1254 or the NTP Public Services Project Download Page
1255 Properly monitor your ntpd instances, and auto-restart ntpd
1256 (without -g) if it stops running.
1257 Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
1259 * Broadcast Mode Replay Prevention DoS
1260 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1261 References: Sec 3114 / CVE-2016-7427 / VU#633847
1262 Affects: ntp-4.2.8p6, up to but not including ntp-4.2.8p9, and
1263 ntp-4.3.90 up to, but not including ntp-4.3.94.
1264 CVSS2: LOW 3.3 (AV:A/AC:L/Au:N/C:N/I:N/A:P)
1265 CVSS3: MED 4.3 CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
1267 The broadcast mode of NTP is expected to only be used in a
1268 trusted network. If the broadcast network is accessible to an
1269 attacker, a potentially exploitable denial of service
1270 vulnerability in ntpd's broadcast mode replay prevention
1271 functionality can be abused. An attacker with access to the NTP
1272 broadcast domain can periodically inject specially crafted
1273 broadcast mode NTP packets into the broadcast domain which,
1274 while being logged by ntpd, can cause ntpd to reject broadcast
1275 mode packets from legitimate NTP broadcast servers.
1278 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1279 or the NTP Public Services Project Download Page
1280 Properly monitor your ntpd instances, and auto-restart ntpd
1281 (without -g) if it stops running.
1282 Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
1284 * Broadcast Mode Poll Interval Enforcement DoS
1285 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1286 References: Sec 3113 / CVE-2016-7428 / VU#633847
1287 Affects: ntp-4.2.8p6, up to but not including ntp-4.2.8p9, and
1288 ntp-4.3.90 up to, but not including ntp-4.3.94
1289 CVSS2: LOW 3.3 (AV:A/AC:L/Au:N/C:N/I:N/A:P)
1290 CVSS3: MED 4.3 CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
1292 The broadcast mode of NTP is expected to only be used in a
1293 trusted network. If the broadcast network is accessible to an
1294 attacker, a potentially exploitable denial of service
1295 vulnerability in ntpd's broadcast mode poll interval enforcement
1296 functionality can be abused. To limit abuse, ntpd restricts the
1297 rate at which each broadcast association will process incoming
1298 packets. ntpd will reject broadcast mode packets that arrive
1299 before the poll interval specified in the preceding broadcast
1300 packet expires. An attacker with access to the NTP broadcast
1301 domain can send specially crafted broadcast mode NTP packets to
1302 the broadcast domain which, while being logged by ntpd, will
1303 cause ntpd to reject broadcast mode packets from legitimate NTP
1307 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1308 or the NTP Public Services Project Download Page
1309 Properly monitor your ntpd instances, and auto-restart ntpd
1310 (without -g) if it stops running.
1311 Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
1313 * Windows: ntpd DoS by oversized UDP packet
1314 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1315 References: Sec 3110 / CVE-2016-9312 / VU#633847
1316 Affects Windows only: ntp-4.?.?, up to but not including ntp-4.2.8p9,
1317 and ntp-4.3.0 up to, but not including ntp-4.3.94.
1318 CVSS2: HIGH 7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)
1319 CVSS3: HIGH 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1321 If a vulnerable instance of ntpd on Windows receives a crafted
1322 malicious packet that is "too big", ntpd will stop working.
1325 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1326 or the NTP Public Services Project Download Page
1327 Properly monitor your ntpd instances, and auto-restart ntpd
1328 (without -g) if it stops running.
1329 Credit: This weakness was discovered by Robert Pajak of ABB.
1331 * 0rigin (zero origin) issues
1332 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1333 References: Sec 3102 / CVE-2016-7431 / VU#633847
1334 Affects: ntp-4.2.8p8, and ntp-4.3.93.
1335 CVSS2: MED 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N)
1336 CVSS3: MED 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
1338 Zero Origin timestamp problems were fixed by Bug 2945 in
1339 ntp-4.2.8p6. However, subsequent timestamp validation checks
1340 introduced a regression in the handling of some Zero origin
1344 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1345 or the NTP Public Services Project Download Page
1346 Properly monitor your ntpd instances, and auto-restart ntpd
1347 (without -g) if it stops running.
1348 Credit: This weakness was discovered by Sharon Goldberg and Aanchal
1349 Malhotra of Boston University.
1351 * read_mru_list() does inadequate incoming packet checks
1352 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1353 References: Sec 3082 / CVE-2016-7434 / VU#633847
1354 Affects: ntp-4.2.7p22, up to but not including ntp-4.2.8p9, and
1355 ntp-4.3.0 up to, but not including ntp-4.3.94.
1356 CVSS2: LOW 3.8 (AV:L/AC:H/Au:S/C:N/I:N/A:C)
1357 CVSS3: LOW 3.8 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1359 If ntpd is configured to allow mrulist query requests from a
1360 server that sends a crafted malicious packet, ntpd will crash
1361 on receipt of that crafted malicious mrulist query packet.
1363 Only allow mrulist query packets from trusted hosts.
1365 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1366 or the NTP Public Services Project Download Page
1367 Properly monitor your ntpd instances, and auto-restart ntpd
1368 (without -g) if it stops running.
1369 Credit: This weakness was discovered by Magnus Stubman.
1371 * Attack on interface selection
1372 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1373 References: Sec 3072 / CVE-2016-7429 / VU#633847
1374 Affects: ntp-4.2.7p385, up to but not including ntp-4.2.8p9, and
1375 ntp-4.3.0 up to, but not including ntp-4.3.94
1376 CVSS2: LOW 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
1377 CVSS3: LOW 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
1379 When ntpd receives a server response on a socket that corresponds
1380 to a different interface than was used for the request, the peer
1381 structure is updated to use the interface for new requests. If
1382 ntpd is running on a host with multiple interfaces in separate
1383 networks and the operating system doesn't check source address in
1384 received packets (e.g. rp_filter on Linux is set to 0), an
1385 attacker that knows the address of the source can send a packet
1386 with spoofed source address which will cause ntpd to select wrong
1387 interface for the source and prevent it from sending new requests
1388 until the list of interfaces is refreshed, which happens on
1389 routing changes or every 5 minutes by default. If the attack is
1390 repeated often enough (once per second), ntpd will not be able to
1391 synchronize with the source.
1394 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1395 or the NTP Public Services Project Download Page
1396 If you are going to configure your OS to disable source address
1397 checks, also configure your firewall configuration to control
1398 what interfaces can receive packets from what networks.
1399 Properly monitor your ntpd instances, and auto-restart ntpd
1400 (without -g) if it stops running.
1401 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1403 * Client rate limiting and server responses
1404 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1405 References: Sec 3071 / CVE-2016-7426 / VU#633847
1406 Affects: ntp-4.2.5p203, up to but not including ntp-4.2.8p9, and
1407 ntp-4.3.0 up to, but not including ntp-4.3.94
1408 CVSS2: LOW 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
1409 CVSS3: LOW 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
1411 When ntpd is configured with rate limiting for all associations
1412 (restrict default limited in ntp.conf), the limits are applied
1413 also to responses received from its configured sources. An
1414 attacker who knows the sources (e.g., from an IPv4 refid in
1415 server response) and knows the system is (mis)configured in this
1416 way can periodically send packets with spoofed source address to
1417 keep the rate limiting activated and prevent ntpd from accepting
1418 valid responses from its sources.
1420 While this blanket rate limiting can be useful to prevent
1421 brute-force attacks on the origin timestamp, it allows this DoS
1422 attack. Similarly, it allows the attacker to prevent mobilization
1423 of ephemeral associations.
1426 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1427 or the NTP Public Services Project Download Page
1428 Properly monitor your ntpd instances, and auto-restart ntpd
1429 (without -g) if it stops running.
1430 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1432 * Fix for bug 2085 broke initial sync calculations
1433 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1434 References: Sec 3067 / CVE-2016-7433 / VU#633847
1435 Affects: ntp-4.2.7p385, up to but not including ntp-4.2.8p9, and
1436 ntp-4.3.0 up to, but not including ntp-4.3.94. But the
1437 root-distance calculation in general is incorrect in all versions
1438 of ntp-4 until this release.
1439 CVSS2: LOW 1.2 (AV:L/AC:H/Au:N/C:N/I:N/A:P)
1440 CVSS3: LOW 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
1442 Bug 2085 described a condition where the root delay was included
1443 twice, causing the jitter value to be higher than expected. Due
1444 to a misinterpretation of a small-print variable in The Book, the
1445 fix for this problem was incorrect, resulting in a root distance
1446 that did not include the peer dispersion. The calculations and
1447 formulae have been reviewed and reconciled, and the code has been
1448 updated accordingly.
1450 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1451 or the NTP Public Services Project Download Page
1452 Properly monitor your ntpd instances, and auto-restart ntpd
1453 (without -g) if it stops running.
1454 Credit: This weakness was discovered independently by Brian Utterback of
1455 Oracle, and Sharon Goldberg and Aanchal Malhotra of Boston University.
1459 * [Bug 3142] bug in netmask prefix length detection <perlinger@ntp.org>
1460 * [Bug 3138] gpsdjson refclock should honor fudgetime1. stenn@ntp.org
1461 * [Bug 3129] Unknown hosts can put resolver thread into a hard loop
1462 - moved retry decision where it belongs. <perlinger@ntp.org>
1463 * [Bug 3125] NTPD doesn't fully start when ntp.conf entries are out of order
1464 using the loopback-ppsapi-provider.dll <perlinger@ntp.org>
1465 * [Bug 3116] unit tests for NTP time stamp expansion. <perlinger@ntp.org>
1466 * [Bug 3100] ntpq can't retrieve daemon_version <perlinger@ntp.org>
1467 - fixed extended sysvar lookup (bug introduced with bug 3008 fix)
1468 * [Bug 3095] Compatibility with openssl 1.1 <perlinger@ntp.org>
1469 - applied patches by Kurt Roeckx <kurt@roeckx.be> to source
1470 - added shim layer for SSL API calls with issues (both directions)
1471 * [Bug 3089] Serial Parser does not work anymore for hopfser like device
1472 - simplified / refactored hex-decoding in driver. <perlinger@ntp.org>
1473 * [Bug 3084] update-leap mis-parses the leapfile name. HStenn.
1474 * [Bug 3068] Linker warnings when building on Solaris. perlinger@ntp.org
1475 - applied patch thanks to Andrew Stormont <andyjstormont@gmail.com>
1476 * [Bug 3067] Root distance calculation needs improvement. HStenn
1477 * [Bug 3066] NMEA clock ignores pps. perlinger@ntp.org
1478 - PPS-HACK works again.
1479 * [Bug 3059] Potential buffer overrun from oversized hash <perlinger@ntp.org>
1480 - applied patch by Brian Utterback <brian.utterback@oracle.com>
1481 * [Bug 3053] ntp_loopfilter.c frequency calc precedence error. Sarah White.
1482 * [Bug 3050] Fix for bug #2960 causes [...] spurious error message.
1484 - patches by Reinhard Max <max@suse.com> and Havard Eidnes <he@uninett.no>
1485 * [Bug 3047] Fix refclock_jjy C-DEX JST2000. abe@ntp.org
1486 - Patch provided by Kuramatsu.
1487 * [Bug 3021] unity_fixture.c needs pragma weak <perlinger@ntp.org>
1488 - removed unnecessary & harmful decls of 'setUp()' & 'tearDown()'
1489 * [Bug 3019] Windows: ERROR_HOST_UNREACHABLE block packet processing. DMayer
1490 * [Bug 2998] sntp/tests/packetProcessing.c broken without openssl. JPerlinger
1491 * [Bug 2961] sntp/tests/packetProcessing.c assumes AUTOKEY. HStenn.
1492 * [Bug 2959] refclock_jupiter: gps week correction <perlinger@ntp.org>
1493 - fixed GPS week expansion to work based on build date. Special thanks
1494 to Craig Leres for initial patch and testing.
1495 * [Bug 2951] ntpd tests fail: multiple definition of `send_via_ntp_signd'
1496 - fixed Makefile.am <perlinger@ntp.org>
1497 * [Bug 2689] ATOM driver processes last PPS pulse at startup,
1498 even if it is very old <perlinger@ntp.org>
1499 - make sure PPS source is alive before processing samples
1500 - improve stability close to the 500ms phase jump (phase gate)
1501 * Fix typos in include/ntp.h.
1502 * Shim X509_get_signature_nid() if needed
1503 * git author attribution cleanup
1504 * bk ignore file cleanup
1505 * remove locks in Windows IO, use rpc-like thread synchronisation instead
1508 NTP 4.2.8p8 (Harlan Stenn <stenn@ntp.org>, 2016/06/02)
1510 Focus: Security, Bug fixes, enhancements.
1514 In addition to bug fixes and enhancements, this release fixes the
1515 following 1 high- and 4 low-severity vulnerabilities:
1518 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1519 References: Sec 3046 / CVE-2016-4957 / VU#321640
1520 Affects: ntp-4.2.8p7, and ntp-4.3.92.
1521 CVSS2: HIGH 7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)
1522 CVSS3: HIGH 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1523 Summary: The fix for Sec 3007 in ntp-4.2.8p7 contained a bug that
1524 could cause ntpd to crash.
1527 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1528 or the NTP Public Services Project Download Page
1529 If you cannot upgrade from 4.2.8p7, the only other alternatives
1530 are to patch your code or filter CRYPTO_NAK packets.
1531 Properly monitor your ntpd instances, and auto-restart ntpd
1532 (without -g) if it stops running.
1533 Credit: This weakness was discovered by Nicolas Edet of Cisco.
1535 * Bad authentication demobilizes ephemeral associations
1536 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1537 References: Sec 3045 / CVE-2016-4953 / VU#321640
1538 Affects: ntp-4, up to but not including ntp-4.2.8p8, and
1539 ntp-4.3.0 up to, but not including ntp-4.3.93.
1540 CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
1541 CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1542 Summary: An attacker who knows the origin timestamp and can send a
1543 spoofed packet containing a CRYPTO-NAK to an ephemeral peer
1544 target before any other response is sent can demobilize that
1548 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1549 or the NTP Public Services Project Download Page
1550 Properly monitor your ntpd instances.
1551 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1553 * Processing spoofed server packets
1554 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1555 References: Sec 3044 / CVE-2016-4954 / VU#321640
1556 Affects: ntp-4, up to but not including ntp-4.2.8p8, and
1557 ntp-4.3.0 up to, but not including ntp-4.3.93.
1558 CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
1559 CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1560 Summary: An attacker who is able to spoof packets with correct origin
1561 timestamps from enough servers before the expected response
1562 packets arrive at the target machine can affect some peer
1563 variables and, for example, cause a false leap indication to be set.
1566 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1567 or the NTP Public Services Project Download Page
1568 Properly monitor your ntpd instances.
1569 Credit: This weakness was discovered by Jakub Prokes of Red Hat.
1571 * Autokey association reset
1572 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1573 References: Sec 3043 / CVE-2016-4955 / VU#321640
1574 Affects: ntp-4, up to but not including ntp-4.2.8p8, and
1575 ntp-4.3.0 up to, but not including ntp-4.3.93.
1576 CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
1577 CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1578 Summary: An attacker who is able to spoof a packet with a correct
1579 origin timestamp before the expected response packet arrives at
1580 the target machine can send a CRYPTO_NAK or a bad MAC and cause
1581 the association's peer variables to be cleared. If this can be
1582 done often enough, it will prevent that association from working.
1585 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1586 or the NTP Public Services Project Download Page
1587 Properly monitor your ntpd instances.
1588 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1590 * Broadcast interleave
1591 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1592 References: Sec 3042 / CVE-2016-4956 / VU#321640
1593 Affects: ntp-4, up to but not including ntp-4.2.8p8, and
1594 ntp-4.3.0 up to, but not including ntp-4.3.93.
1595 CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
1596 CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1597 Summary: The fix for NtpBug2978 does not cover broadcast associations,
1598 so broadcast clients can be triggered to flip into interleave mode.
1601 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1602 or the NTP Public Services Project Download Page
1603 Properly monitor your ntpd instances.
1604 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1607 * [Bug 3038] NTP fails to build in VS2015. perlinger@ntp.org
1608 - provide build environment
1609 - 'wint_t' and 'struct timespec' defined by VS2015
1610 - fixed print()/scanf() format issues
1611 * [Bug 3052] Add a .gitignore file. Edmund Wong.
1612 * [Bug 3054] miscopt.html documents the allan intercept in seconds. SWhite.
1613 * [Bug 3058] fetch_timestamp() mishandles 64-bit alignment. Brian Utterback,
1615 * Fix typo in ntp-wait and plot_summary. HStenn.
1616 * Make sure we have an "author" file for git imports. HStenn.
1617 * Update the sntp problem tests for MacOS. HStenn.
1620 NTP 4.2.8p7 (Harlan Stenn <stenn@ntp.org>, 2016/04/26)
1622 Focus: Security, Bug fixes, enhancements.
1626 When building NTP from source, there is a new configure option
1627 available, --enable-dynamic-interleave. More information on this below.
1629 Also note that ntp-4.2.8p7 logs more "unexpected events" than previous
1630 versions of ntp. These events have almost certainly happened in the
1631 past, it's just that they were silently counted and not logged. With
1632 the increasing awareness around security, we feel it's better to clearly
1633 log these events to help detect abusive behavior. This increased
1634 logging can also help detect other problems, too.
1636 In addition to bug fixes and enhancements, this release fixes the
1637 following 9 low- and medium-severity vulnerabilities:
1639 * Improve NTP security against buffer comparison timing attacks,
1640 AKA: authdecrypt-timing
1641 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1642 References: Sec 2879 / CVE-2016-1550
1643 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1644 4.3.0 up to, but not including 4.3.92
1645 CVSSv2: LOW 2.6 - (AV:L/AC:H/Au:N/C:P/I:P/A:N)
1646 CVSSv3: MED 4.0 - CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
1647 Summary: Packet authentication tests have been performed using
1648 memcmp() or possibly bcmp(), and it is potentially possible
1649 for a local or perhaps LAN-based attacker to send a packet with
1650 an authentication payload and indirectly observe how much of
1651 the digest has matched.
1653 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1654 or the NTP Public Services Project Download Page.
1655 Properly monitor your ntpd instances.
1656 Credit: This weakness was discovered independently by Loganaden
1657 Velvindron, and Matthew Van Gundy and Stephen Gray of Cisco ASIG.
1659 * Zero origin timestamp bypass: Additional KoD checks.
1660 References: Sec 2945 / Sec 2901 / CVE-2015-8138
1661 Affects: All ntp-4 releases up to, but not including 4.2.8p7,
1662 Summary: Improvements to the fixes incorporated in t 4.2.8p6 and 4.3.92.
1664 * peer associations were broken by the fix for NtpBug2899
1665 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1666 References: Sec 2952 / CVE-2015-7704
1667 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1668 4.3.0 up to, but not including 4.3.92
1669 CVSSv2: MED 4.3 - (AV:N/AC:M/Au:N/C:N/I:N/A:P)
1670 Summary: The fix for NtpBug2952 in ntp-4.2.8p5 to address broken peer
1671 associations did not address all of the issues.
1674 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1675 or the NTP Public Services Project Download Page
1676 If you can't upgrade, use "server" associations instead of
1677 "peer" associations.
1678 Monitor your ntpd instances.
1679 Credit: This problem was discovered by Michael Tatarinov.
1681 * Validate crypto-NAKs, AKA: CRYPTO-NAK DoS
1682 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1683 References: Sec 3007 / CVE-2016-1547 / VU#718152
1684 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1685 4.3.0 up to, but not including 4.3.92
1686 CVSS2: MED 4.3 - (AV:N/AC:M/Au:N/C:N/I:N/A:P)
1687 CVSS3: MED 3.7 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1688 Summary: For ntp-4 versions up to but not including ntp-4.2.8p7, an
1689 off-path attacker can cause a preemptable client association to
1690 be demobilized by sending a crypto NAK packet to a victim client
1691 with a spoofed source address of an existing associated peer.
1692 This is true even if authentication is enabled.
1694 Furthermore, if the attacker keeps sending crypto NAK packets,
1695 for example one every second, the victim never has a chance to
1696 reestablish the association and synchronize time with that
1699 For ntp-4.2.8 thru ntp-4.2.8p6 there is less risk because more
1700 stringent checks are performed on incoming packets, but there
1701 are still ways to exploit this vulnerability in versions before
1705 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1706 or the NTP Public Services Project Download Page
1707 Properly monitor your ntpd instances
1708 Credit: This weakness was discovered by Stephen Gray and
1709 Matthew Van Gundy of Cisco ASIG.
1711 * ctl_getitem() return value not always checked
1712 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1713 References: Sec 3008 / CVE-2016-2519
1714 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1715 4.3.0 up to, but not including 4.3.92
1716 CVSSv2: MED 4.9 - (AV:N/AC:H/Au:S/C:N/I:N/A:C)
1717 CVSSv3: MED 4.2 - CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1718 Summary: ntpq and ntpdc can be used to store and retrieve information
1719 in ntpd. It is possible to store a data value that is larger
1720 than the size of the buffer that the ctl_getitem() function of
1721 ntpd uses to report the return value. If the length of the
1722 requested data value returned by ctl_getitem() is too large,
1723 the value NULL is returned instead. There are 2 cases where the
1724 return value from ctl_getitem() was not directly checked to make
1725 sure it's not NULL, but there are subsequent INSIST() checks
1726 that make sure the return value is not NULL. There are no data
1727 values ordinarily stored in ntpd that would exceed this buffer
1728 length. But if one has permission to store values and one stores
1729 a value that is "too large", then ntpd will abort if an attempt
1730 is made to read that oversized value.
1733 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1734 or the NTP Public Services Project Download Page
1735 Properly monitor your ntpd instances.
1736 Credit: This weakness was discovered by Yihan Lian of the Cloud
1737 Security Team, Qihoo 360.
1739 * Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC
1740 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1741 References: Sec 3009 / CVE-2016-2518 / VU#718152
1742 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1743 4.3.0 up to, but not including 4.3.92
1744 CVSS2: LOW 2.1 - (AV:N/AC:H/Au:S/C:N/I:N/A:P)
1745 CVSS3: LOW 2.0 - CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
1746 Summary: Using a crafted packet to create a peer association with
1747 hmode > 7 causes the MATCH_ASSOC() lookup to make an
1748 out-of-bounds reference.
1751 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1752 or the NTP Public Services Project Download Page
1753 Properly monitor your ntpd instances
1754 Credit: This weakness was discovered by Yihan Lian of the Cloud
1755 Security Team, Qihoo 360.
1757 * remote configuration trustedkey/requestkey/controlkey values are not
1759 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1760 References: Sec 3010 / CVE-2016-2517 / VU#718152
1761 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1762 4.3.0 up to, but not including 4.3.92
1763 CVSS2: MED 4.9 - (AV:N/AC:H/Au:S/C:N/I:N/A:C)
1764 CVSS3: MED 4.2 - CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1765 Summary: If ntpd was expressly configured to allow for remote
1766 configuration, a malicious user who knows the controlkey for
1767 ntpq or the requestkey for ntpdc (if mode7 is expressly enabled)
1768 can create a session with ntpd and then send a crafted packet to
1769 ntpd that will change the value of the trustedkey, controlkey,
1770 or requestkey to a value that will prevent any subsequent
1771 authentication with ntpd until ntpd is restarted.
1774 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1775 or the NTP Public Services Project Download Page
1776 Properly monitor your ntpd instances
1777 Credit: This weakness was discovered by Yihan Lian of the Cloud
1778 Security Team, Qihoo 360.
1780 * Duplicate IPs on unconfig directives will cause an assertion botch in ntpd
1781 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1782 References: Sec 3011 / CVE-2016-2516 / VU#718152
1783 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1784 4.3.0 up to, but not including 4.3.92
1785 CVSS2: MED 6.3 - (AV:N/AC:M/Au:S/C:N/I:N/A:C)
1786 CVSS3: MED 4.2 - CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1787 Summary: If ntpd was expressly configured to allow for remote
1788 configuration, a malicious user who knows the controlkey for
1789 ntpq or the requestkey for ntpdc (if mode7 is expressly enabled)
1790 can create a session with ntpd and if an existing association is
1791 unconfigured using the same IP twice on the unconfig directive
1792 line, ntpd will abort.
1795 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1796 or the NTP Public Services Project Download Page
1797 Properly monitor your ntpd instances
1798 Credit: This weakness was discovered by Yihan Lian of the Cloud
1799 Security Team, Qihoo 360.
1801 * Refclock impersonation vulnerability
1802 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1803 References: Sec 3020 / CVE-2016-1551
1804 Affects: On a very limited number of OSes, all NTP releases up to but
1805 not including 4.2.8p7, and 4.3.0 up to but not including 4.3.92.
1806 By "very limited number of OSes" we mean no general-purpose OSes
1807 have yet been identified that have this vulnerability.
1808 CVSSv2: LOW 2.6 - (AV:N/AC:H/Au:N/C:N/I:P/A:N)
1809 CVSSv3: LOW 3.7 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
1810 Summary: While most OSes implement martian packet filtering in their
1811 network stack, at least regarding 127.0.0.0/8, some will allow
1812 packets claiming to be from 127.0.0.0/8 that arrive over a
1813 physical network. On these OSes, if ntpd is configured to use a
1814 reference clock an attacker can inject packets over the network
1815 that look like they are coming from that reference clock.
1817 Implement martian packet filtering and BCP-38.
1818 Configure ntpd to use an adequate number of time sources.
1819 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1820 or the NTP Public Services Project Download Page
1821 If you are unable to upgrade and if you are running an OS that
1822 has this vulnerability, implement martian packet filters and
1823 lobby your OS vendor to fix this problem, or run your
1824 refclocks on computers that use OSes that are not vulnerable
1825 to these attacks and have your vulnerable machines get their
1826 time from protected resources.
1827 Properly monitor your ntpd instances.
1828 Credit: This weakness was discovered by Matt Street and others of
1831 The following issues were fixed in earlier releases and contain
1832 improvements in 4.2.8p7:
1834 * Clients that receive a KoD should validate the origin timestamp field.
1835 References: Sec 2901 / CVE-2015-7704, CVE-2015-7705
1836 Affects: All ntp-4 releases up to, but not including 4.2.8p7,
1837 Summary: Improvements to the fixes incorporated into 4.2.8p4 and 4.3.77.
1839 * Skeleton key: passive server with trusted key can serve time.
1840 References: Sec 2936 / CVE-2015-7974
1841 Affects: All ntp-4 releases up to, but not including 4.2.8p7,
1842 Summary: Improvements to the fixes incorporated in t 4.2.8p6 and 4.3.90.
1844 Two other vulnerabilities have been reported, and the mitigations
1845 for these are as follows:
1848 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1849 References: Sec 2978 / CVE-2016-1548
1850 Affects: All ntp-4 releases.
1851 CVSSv2: MED 6.4 - (AV:N/AC:L/Au:N/C:N/I:P/A:P)
1852 CVSSv3: MED 7.2 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
1853 Summary: It is possible to change the time of an ntpd client or deny
1854 service to an ntpd client by forcing it to change from basic
1855 client/server mode to interleaved symmetric mode. An attacker
1856 can spoof a packet from a legitimate ntpd server with an origin
1857 timestamp that matches the peer->dst timestamp recorded for that
1858 server. After making this switch, the client will reject all
1859 future legitimate server responses. It is possible to force the
1860 victim client to move time after the mode has been changed.
1861 ntpq gives no indication that the mode has been switched.
1864 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1865 or the NTP Public Services Project Download Page. These
1866 versions will not dynamically "flip" into interleave mode
1867 unless configured to do so.
1868 Properly monitor your ntpd instances.
1869 Credit: This weakness was discovered by Miroslav Lichvar of RedHat
1870 and separately by Jonathan Gardner of Cisco ASIG.
1872 * Sybil vulnerability: ephemeral association attack
1873 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1874 References: Sec 3012 / CVE-2016-1549
1875 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1876 4.3.0 up to, but not including 4.3.92
1877 CVSSv2: LOW 3.5 - (AV:N/AC:M/Au:S/C:N/I:P/A:N)
1878 CVSS3v: MED 5.3 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
1879 Summary: ntpd can be vulnerable to Sybil attacks. If one is not using
1880 the feature introduced in ntp-4.2.8p6 allowing an optional 4th
1881 field in the ntp.keys file to specify which IPs can serve time,
1882 a malicious authenticated peer can create arbitrarily-many
1883 ephemeral associations in order to win the clock selection of
1884 ntpd and modify a victim's clock.
1887 Use the 4th field in the ntp.keys file to specify which IPs
1888 can be time servers.
1889 Properly monitor your ntpd instances.
1890 Credit: This weakness was discovered by Matthew Van Gundy of Cisco ASIG.
1894 * [Bug 2831] Segmentation Fault in DNS lookup during startup. perlinger@ntp.org
1895 - fixed yet another race condition in the threaded resolver code.
1896 * [Bug 2858] bool support. Use stdbool.h when available. HStenn.
1897 * [Bug 2879] Improve NTP security against timing attacks. perlinger@ntp.org
1898 - integrated patches by Loganaden Velvidron <logan@ntp.org>
1899 with some modifications & unit tests
1900 * [Bug 2960] async name resolution fixes for chroot() environments.
1902 * [Bug 2994] Systems with HAVE_SIGNALED_IO fail to compile. perlinger@ntp.org
1903 * [Bug 2995] Fixes to compile on Windows
1904 * [Bug 2999] out-of-bounds access in 'is_safe_filename()'. perlinger@ntp.org
1905 * [Bug 3013] Fix for ssl_init.c SHA1 test. perlinger@ntp.org
1906 - Patch provided by Ch. Weisgerber
1907 * [Bug 3015] ntpq: config-from-file: "request contains an unprintable character"
1908 - A change related to [Bug 2853] forbids trailing white space in
1909 remote config commands. perlinger@ntp.org
1910 * [Bug 3019] NTPD stops processing packets after ERROR_HOST_UNREACHABLE
1911 - report and patch from Aleksandr Kostikov.
1912 - Overhaul of Windows IO completion port handling. perlinger@ntp.org
1913 * [Bug 3022] authkeys.c should be refactored. perlinger@ntp.org
1914 - fixed memory leak in access list (auth[read]keys.c)
1915 - refactored handling of key access lists (auth[read]keys.c)
1916 - reduced number of error branches (authreadkeys.c)
1917 * [Bug 3023] ntpdate cannot correct dates in the future. perlinger@ntp.org
1918 * [Bug 3030] ntpq needs a general way to specify refid output format. HStenn.
1919 * [Bug 3031] ntp broadcastclient unable to synchronize to an server
1920 when the time of server changed. perlinger@ntp.org
1921 - Check the initial delay calculation and reject/unpeer the broadcast
1922 server if the delay exceeds 50ms. Retry again after the next
1924 * [Bug 3036] autokey trips an INSIST in authistrustedip(). Harlan Stenn.
1925 * Document ntp.key's optional IP list in authenetic.html. Harlan Stenn.
1926 * Update html/xleave.html documentation. Harlan Stenn.
1927 * Update ntp.conf documentation. Harlan Stenn.
1928 * Fix some Credit: attributions in the NEWS file. Harlan Stenn.
1929 * Fix typo in html/monopt.html. Harlan Stenn.
1930 * Add README.pullrequests. Harlan Stenn.
1931 * Cleanup to include/ntp.h. Harlan Stenn.
1933 New option to 'configure':
1935 While looking in to the issues around Bug 2978, the "interleave pivot"
1936 issue, it became clear that there are some intricate and unresolved
1937 issues with interleave operations. We also realized that the interleave
1938 protocol was never added to the NTPv4 Standard, and it should have been.
1940 Interleave mode was first released in July of 2008, and can be engaged
1941 in two ways. Any 'peer' and 'broadcast' lines in the ntp.conf file may
1942 contain the 'xleave' option, which will expressly enable interlave mode
1943 for that association. Additionally, if a time packet arrives and is
1944 found inconsistent with normal protocol behavior but has certain
1945 characteristics that are compatible with interleave mode, NTP will
1946 dynamically switch to interleave mode. With sufficient knowledge, an
1947 attacker can send a crafted forged packet to an NTP instance that
1948 triggers only one side to enter interleaved mode.
1950 To prevent this attack until we can thoroughly document, describe,
1951 fix, and test the dynamic interleave mode, we've added a new
1952 'configure' option to the build process:
1954 --enable-dynamic-interleave
1956 This option controls whether or not NTP will, if conditions are right,
1957 engage dynamic interleave mode. Dynamic interleave mode is disabled by
1958 default in ntp-4.2.8p7.
1961 NTP 4.2.8p6 (Harlan Stenn <stenn@ntp.org>, 2016/01/20)
1963 Focus: Security, Bug fixes, enhancements.
1967 In addition to bug fixes and enhancements, this release fixes the
1968 following 1 low- and 8 medium-severity vulnerabilities:
1970 * Potential Infinite Loop in 'ntpq'
1971 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1972 References: Sec 2548 / CVE-2015-8158
1973 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1974 4.3.0 up to, but not including 4.3.90
1975 CVSS2: (AV:N/AC:M/Au:N/C:N/I:N/A:P) Base Score: 4.3 - MEDIUM
1976 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Base Score: 5.3 - MEDIUM
1977 Summary: 'ntpq' processes incoming packets in a loop in 'getresponse()'.
1978 The loop's only stopping conditions are receiving a complete and
1979 correct response or hitting a small number of error conditions.
1980 If the packet contains incorrect values that don't trigger one of
1981 the error conditions, the loop continues to receive new packets.
1982 Note well, this is an attack against an instance of 'ntpq', not
1983 'ntpd', and this attack requires the attacker to do one of the
1985 * Own a malicious NTP server that the client trusts
1986 * Prevent a legitimate NTP server from sending packets to
1988 * MITM the 'ntpq' communications between the 'ntpq' client
1991 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
1992 or the NTP Public Services Project Download Page
1993 Credit: This weakness was discovered by Jonathan Gardner of Cisco ASIG.
1995 * 0rigin: Zero Origin Timestamp Bypass
1996 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1997 References: Sec 2945 / CVE-2015-8138
1998 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1999 4.3.0 up to, but not including 4.3.90
2000 CVSS2: (AV:N/AC:L/Au:N/C:N/I:P/A:N) Base Score: 5.0 - MEDIUM
2001 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Base Score: 5.3 - MEDIUM
2002 (3.7 - LOW if you score AC:L)
2003 Summary: To distinguish legitimate peer responses from forgeries, a
2004 client attempts to verify a response packet by ensuring that the
2005 origin timestamp in the packet matches the origin timestamp it
2006 transmitted in its last request. A logic error exists that
2007 allows packets with an origin timestamp of zero to bypass this
2008 check whenever there is not an outstanding request to the server.
2010 Configure 'ntpd' to get time from multiple sources.
2011 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
2012 or the NTP Public Services Project Download Page.
2013 Monitor your 'ntpd' instances.
2014 Credit: This weakness was discovered by Matthey Van Gundy and
2015 Jonathan Gardner of Cisco ASIG.
2017 * Stack exhaustion in recursive traversal of restriction list
2018 Date Resolved: Stable (4.2.8p6) 19 Jan 2016
2019 References: Sec 2940 / CVE-2015-7978
2020 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
2021 4.3.0 up to, but not including 4.3.90
2022 CVSS: (AV:N/AC:M/Au:N/C:N/I:N/A:P) Base Score: 4.3 - MEDIUM
2023 Summary: An unauthenticated 'ntpdc reslist' command can cause a
2024 segmentation fault in ntpd by exhausting the call stack.
2027 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
2028 or the NTP Public Services Project Download Page.
2029 If you are unable to upgrade:
2030 In ntp-4.2.8, mode 7 is disabled by default. Don't enable it.
2031 If you must enable mode 7:
2032 configure the use of a 'requestkey' to control who can
2033 issue mode 7 requests.
2034 configure 'restrict noquery' to further limit mode 7
2035 requests to trusted sources.
2036 Monitor your ntpd instances.
2037 Credit: This weakness was discovered by Stephen Gray at Cisco ASIG.
2039 * Off-path Denial of Service (!DoS) attack on authenticated broadcast mode
2040 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
2041 References: Sec 2942 / CVE-2015-7979
2042 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
2043 4.3.0 up to, but not including 4.3.90
2044 CVSS: (AV:N/AC:M/Au:N/C:N/I:P/A:P) Base Score: 5.8
2045 Summary: An off-path attacker can send broadcast packets with bad
2046 authentication (wrong key, mismatched key, incorrect MAC, etc)
2047 to broadcast clients. It is observed that the broadcast client
2048 tears down the association with the broadcast server upon
2049 receiving just one bad packet.
2052 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
2053 or the NTP Public Services Project Download Page.
2054 Monitor your 'ntpd' instances.
2055 If this sort of attack is an active problem for you, you have
2056 deeper problems to investigate. In this case also consider
2057 having smaller NTP broadcast domains.
2058 Credit: This weakness was discovered by Aanchal Malhotra of Boston
2061 * reslist NULL pointer dereference
2062 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
2063 References: Sec 2939 / CVE-2015-7977
2064 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
2065 4.3.0 up to, but not including 4.3.90
2066 CVSS: (AV:N/AC:M/Au:N/C:N/I:N/A:P) Base Score: 4.3 - MEDIUM
2067 Summary: An unauthenticated 'ntpdc reslist' command can cause a
2068 segmentation fault in ntpd by causing a NULL pointer dereference.
2071 Upgrade to 4.2.8p6, or later, from NTP Project Download Page or
2072 the NTP Public Services Project Download Page.
2073 If you are unable to upgrade:
2074 mode 7 is disabled by default. Don't enable it.
2075 If you must enable mode 7:
2076 configure the use of a 'requestkey' to control who can
2077 issue mode 7 requests.
2078 configure 'restrict noquery' to further limit mode 7
2079 requests to trusted sources.
2080 Monitor your ntpd instances.
2081 Credit: This weakness was discovered by Stephen Gray of Cisco ASIG.
2083 * 'ntpq saveconfig' command allows dangerous characters in filenames.
2084 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
2085 References: Sec 2938 / CVE-2015-7976
2086 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
2087 4.3.0 up to, but not including 4.3.90
2088 CVSS: (AV:N/AC:L/Au:S/C:N/I:P/A:N) Base Score: 4.0 - MEDIUM
2089 Summary: The ntpq saveconfig command does not do adequate filtering
2090 of special characters from the supplied filename.
2091 Note well: The ability to use the saveconfig command is controlled
2092 by the 'restrict nomodify' directive, and the recommended default
2093 configuration is to disable this capability. If the ability to
2094 execute a 'saveconfig' is required, it can easily (and should) be
2095 limited and restricted to a known small number of IP addresses.
2098 use 'restrict default nomodify' in your 'ntp.conf' file.
2099 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page.
2100 If you are unable to upgrade:
2101 build NTP with 'configure --disable-saveconfig' if you will
2102 never need this capability, or
2103 use 'restrict default nomodify' in your 'ntp.conf' file. Be
2104 careful about what IPs have the ability to send 'modify'
2106 Monitor your ntpd instances.
2107 'saveconfig' requests are logged to syslog - monitor your syslog files.
2108 Credit: This weakness was discovered by Jonathan Gardner of Cisco ASIG.
2110 * nextvar() missing length check in ntpq
2111 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
2112 References: Sec 2937 / CVE-2015-7975
2113 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
2114 4.3.0 up to, but not including 4.3.90
2115 CVSS: (AV:L/AC:H/Au:N/C:N/I:N/A:P) Base Score: 1.2 - LOW
2116 If you score A:C, this becomes 4.0.
2117 CVSSv3: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L) Base Score 2.9, LOW
2118 Summary: ntpq may call nextvar() which executes a memcpy() into the
2119 name buffer without a proper length check against its maximum
2120 length of 256 bytes. Note well that we're taking about ntpq here.
2121 The usual worst-case effect of this vulnerability is that the
2122 specific instance of ntpq will crash and the person or process
2123 that did this will have stopped themselves.
2125 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
2126 or the NTP Public Services Project Download Page.
2127 If you are unable to upgrade:
2128 If you have scripts that feed input to ntpq make sure there are
2129 some sanity checks on the input received from the "outside".
2130 This is potentially more dangerous if ntpq is run as root.
2131 Credit: This weakness was discovered by Jonathan Gardner at Cisco ASIG.
2133 * Skeleton Key: Any trusted key system can serve time
2134 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
2135 References: Sec 2936 / CVE-2015-7974
2136 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
2137 4.3.0 up to, but not including 4.3.90
2138 CVSS: (AV:N/AC:H/Au:S/C:N/I:C/A:N) Base Score: 4.9
2139 Summary: Symmetric key encryption uses a shared trusted key. The
2140 reported title for this issue was "Missing key check allows
2141 impersonation between authenticated peers" and the report claimed
2142 "A key specified only for one server should only work to
2143 authenticate that server, other trusted keys should be refused."
2144 Except there has never been any correlation between this trusted
2145 key and server v. clients machines and there has never been any
2146 way to specify a key only for one server. We have treated this as
2147 an enhancement request, and ntp-4.2.8p6 includes other checks and
2148 tests to strengthen clients against attacks coming from broadcast
2152 If this scenario represents a real or a potential issue for you,
2153 upgrade to 4.2.8p6, or later, from the NTP Project Download
2154 Page or the NTP Public Services Project Download Page, and
2155 use the new field in the ntp.keys file that specifies the list
2156 of IPs that are allowed to serve time. Note that this alone
2157 will not protect against time packets with forged source IP
2158 addresses, however other changes in ntp-4.2.8p6 provide
2159 significant mitigation against broadcast attacks. MITM attacks
2160 are a different story.
2161 If you are unable to upgrade:
2162 Don't use broadcast mode if you cannot monitor your client
2164 If you choose to use symmetric keys to authenticate time
2165 packets in a hostile environment where ephemeral time
2166 servers can be created, or if it is expected that malicious
2167 time servers will participate in an NTP broadcast domain,
2168 limit the number of participating systems that participate
2169 in the shared-key group.
2170 Monitor your ntpd instances.
2171 Credit: This weakness was discovered by Matt Street of Cisco ASIG.
2173 * Deja Vu: Replay attack on authenticated broadcast mode
2174 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
2175 References: Sec 2935 / CVE-2015-7973
2176 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
2177 4.3.0 up to, but not including 4.3.90
2178 CVSS: (AV:A/AC:M/Au:N/C:N/I:P/A:P) Base Score: 4.3 - MEDIUM
2179 Summary: If an NTP network is configured for broadcast operations then
2180 either a man-in-the-middle attacker or a malicious participant
2181 that has the same trusted keys as the victim can replay time packets.
2184 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
2185 or the NTP Public Services Project Download Page.
2186 If you are unable to upgrade:
2187 Don't use broadcast mode if you cannot monitor your client servers.
2188 Monitor your ntpd instances.
2189 Credit: This weakness was discovered by Aanchal Malhotra of Boston
2194 * [Bug 2772] adj_systime overflows tv_usec. perlinger@ntp.org
2195 * [Bug 2814] msyslog deadlock when signaled. perlinger@ntp.org
2196 - applied patch by shenpeng11@huawei.com with minor adjustments
2197 * [Bug 2882] Look at ntp_request.c:list_peers_sum(). perlinger@ntp.org
2198 * [Bug 2891] Deadlock in deferred DNS lookup framework. perlinger@ntp.org
2199 * [Bug 2892] Several test cases assume IPv6 capabilities even when
2200 IPv6 is disabled in the build. perlinger@ntp.org
2201 - Found this already fixed, but validation led to cleanup actions.
2202 * [Bug 2905] DNS lookups broken. perlinger@ntp.org
2203 - added limits to stack consumption, fixed some return code handling
2204 * [Bug 2971] ntpq bails on ^C: select fails: Interrupted system call
2205 - changed stacked/nested handling of CTRL-C. perlinger@ntp.org
2206 - make CTRL-C work for retrieval and printing od MRU list. perlinger@ntp.org
2207 * [Bug 2980] reduce number of warnings. perlinger@ntp.org
2208 - integrated several patches from Havard Eidnes (he@uninett.no)
2209 * [Bug 2985] bogus calculation in authkeys.c perlinger@ntp.org
2210 - implement 'auth_log2()' using integer bithack instead of float calculation
2211 * Make leapsec_query debug messages less verbose. Harlan Stenn.
2214 NTP 4.2.8p5 (Harlan Stenn <stenn@ntp.org>, 2016/01/07)
2216 Focus: Security, Bug fixes, enhancements.
2220 In addition to bug fixes and enhancements, this release fixes the
2221 following medium-severity vulnerability:
2223 * Small-step/big-step. Close the panic gate earlier.
2224 References: Sec 2956, CVE-2015-5300
2225 Affects: All ntp-4 releases up to, but not including 4.2.8p5, and
2226 4.3.0 up to, but not including 4.3.78
2227 CVSS3: (AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:L) Base Score: 4.0, MEDIUM
2228 Summary: If ntpd is always started with the -g option, which is
2229 common and against long-standing recommendation, and if at the
2230 moment ntpd is restarted an attacker can immediately respond to
2231 enough requests from enough sources trusted by the target, which
2232 is difficult and not common, there is a window of opportunity
2233 where the attacker can cause ntpd to set the time to an
2234 arbitrary value. Similarly, if an attacker is able to respond
2235 to enough requests from enough sources trusted by the target,
2236 the attacker can cause ntpd to abort and restart, at which
2237 point it can tell the target to set the time to an arbitrary
2238 value if and only if ntpd was re-started against long-standing
2239 recommendation with the -g flag, or if ntpd was not given the
2240 -g flag, the attacker can move the target system's time by at
2241 most 900 seconds' time per attack.
2243 Configure ntpd to get time from multiple sources.
2244 Upgrade to 4.2.8p5, or later, from the NTP Project Download
2245 Page or the NTP Public Services Project Download Page
2246 As we've long documented, only use the -g option to ntpd in
2247 cold-start situations.
2248 Monitor your ntpd instances.
2249 Credit: This weakness was discovered by Aanchal Malhotra,
2250 Isaac E. Cohen, and Sharon Goldberg at Boston University.
2252 NOTE WELL: The -g flag disables the limit check on the panic_gate
2253 in ntpd, which is 900 seconds by default. The bug identified by
2254 the researchers at Boston University is that the panic_gate
2255 check was only re-enabled after the first change to the system
2256 clock that was greater than 128 milliseconds, by default. The
2257 correct behavior is that the panic_gate check should be
2258 re-enabled after any initial time correction.
2260 If an attacker is able to inject consistent but erroneous time
2261 responses to your systems via the network or "over the air",
2262 perhaps by spoofing radio, cellphone, or navigation satellite
2263 transmissions, they are in a great position to affect your
2264 system's clock. There comes a point where your very best
2267 Configure ntpd to get time from multiple sources.
2268 Monitor your ntpd instances.
2272 * Coverity submission process updated from Coverity 5 to Coverity 7.
2273 The NTP codebase has been undergoing regular Coverity scans on an
2274 ongoing basis since 2006. As part of our recent upgrade from
2275 Coverity 5 to Coverity 7, Coverity identified 16 nits in some of
2276 the newly-written Unity test programs. These were fixed.
2277 * [Bug 2829] Clean up pipe_fds in ntpd.c perlinger@ntp.org
2278 * [Bug 2887] stratum -1 config results as showing value 99
2279 - fudge stratum should only accept values [0..16]. perlinger@ntp.org
2280 * [Bug 2932] Update leapsecond file info in miscopt.html. CWoodbury, HStenn.
2281 * [Bug 2934] tests/ntpd/t-ntp_scanner.c has a magic constant wired in. HMurray
2282 * [Bug 2944] errno is not preserved properly in ntpdate after sendto call.
2283 - applied patch by Christos Zoulas. perlinger@ntp.org
2284 * [Bug 2952] Peer associations broken by fix for Bug 2901/CVE-2015-7704.
2285 * [Bug 2954] Version 4.2.8p4 crashes on startup on some OSes.
2286 - fixed data race conditions in threaded DNS worker. perlinger@ntp.org
2287 - limit threading warm-up to linux; FreeBSD bombs on it. perlinger@ntp.org
2288 * [Bug 2957] 'unsigned int' vs 'size_t' format clash. perlinger@ntp.org
2289 - accept key file only if there are no parsing errors
2290 - fixed size_t/u_int format clash
2291 - fixed wrong use of 'strlcpy'
2292 * [Bug 2958] ntpq: fatal error messages need a final newline. Craig Leres.
2293 * [Bug 2962] truncation of size_t/ptrdiff_t on 64bit targets. perlinger@ntp.org
2294 - fixed several other warnings (cast-alignment, missing const, missing prototypes)
2295 - promote use of 'size_t' for values that express a size
2296 - use ptr-to-const for read-only arguments
2297 - make sure SOCKET values are not truncated (win32-specific)
2298 - format string fixes
2299 * [Bug 2965] Local clock didn't work since 4.2.8p4. Martin Burnicki.
2300 * [Bug 2967] ntpdate command suffers an assertion failure
2301 - fixed ntp_rfc2553.c to return proper address length. perlinger@ntp.org
2302 * [Bug 2969] Seg fault from ntpq/mrulist when looking at server with
2303 lots of clients. perlinger@ntp.org
2304 * [Bug 2971] ntpq bails on ^C: select fails: Interrupted system call
2305 - changed stacked/nested handling of CTRL-C. perlinger@ntp.org
2306 * Unity cleanup for FreeBSD-6.4. Harlan Stenn.
2307 * Unity test cleanup. Harlan Stenn.
2308 * Libevent autoconf pthread fixes for FreeBSD-10. Harlan Stenn.
2309 * Header cleanup in tests/sandbox/uglydate.c. Harlan Stenn.
2310 * Header cleanup in tests/libntp/sfptostr.c. Harlan Stenn.
2311 * Quiet a warning from clang. Harlan Stenn.
2314 NTP 4.2.8p4 (Harlan Stenn <stenn@ntp.org>, 2015/10/21)
2316 Focus: Security, Bug fixes, enhancements.
2320 In addition to bug fixes and enhancements, this release fixes the
2321 following 13 low- and medium-severity vulnerabilities:
2323 * Incomplete vallen (value length) checks in ntp_crypto.c, leading
2324 to potential crashes or potential code injection/information leakage.
2326 References: Sec 2899, Sec 2671, CVE-2015-7691, CVE-2015-7692, CVE-2015-7702
2327 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2328 and 4.3.0 up to, but not including 4.3.77
2329 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 4.6
2330 Summary: The fix for CVE-2014-9750 was incomplete in that there were
2331 certain code paths where a packet with particular autokey operations
2332 that contained malicious data was not always being completely
2333 validated. Receipt of these packets can cause ntpd to crash.
2336 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2337 Page or the NTP Public Services Project Download Page
2338 Monitor your ntpd instances.
2339 Credit: This weakness was discovered by Tenable Network Security.
2341 * Clients that receive a KoD should validate the origin timestamp field.
2343 References: Sec 2901 / CVE-2015-7704, CVE-2015-7705
2344 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2345 and 4.3.0 up to, but not including 4.3.77
2346 CVSS: (AV:N/AC:M/Au:N/C:N/I:N/A:P) Base Score: 4.3-5.0 at worst
2347 Summary: An ntpd client that honors Kiss-of-Death responses will honor
2348 KoD messages that have been forged by an attacker, causing it to
2349 delay or stop querying its servers for time updates. Also, an
2350 attacker can forge packets that claim to be from the target and
2351 send them to servers often enough that a server that implements
2352 KoD rate limiting will send the target machine a KoD response to
2353 attempt to reduce the rate of incoming packets, or it may also
2354 trigger a firewall block at the server for packets from the target
2355 machine. For either of these attacks to succeed, the attacker must
2356 know what servers the target is communicating with. An attacker
2357 can be anywhere on the Internet and can frequently learn the
2358 identity of the target's time source by sending the target a
2362 Upgrade to 4.2.8p4, or later, from the NTP Project Download Page
2363 or the NTP Public Services Project Download Page
2364 If you can't upgrade, restrict who can query ntpd to learn who
2365 its servers are, and what IPs are allowed to ask your system
2366 for the time. This mitigation is heavy-handed.
2367 Monitor your ntpd instances.
2369 4.2.8p4 protects against the first attack. For the second attack,
2370 all we can do is warn when it is happening, which we do in 4.2.8p4.
2371 Credit: This weakness was discovered by Aanchal Malhotra,
2372 Issac E. Cohen, and Sharon Goldberg of Boston University.
2374 * configuration directives to change "pidfile" and "driftfile" should
2375 only be allowed locally.
2377 References: Sec 2902 / CVE-2015-5196
2378 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2379 and 4.3.0 up to, but not including 4.3.77
2380 CVSS: (AV:N/AC:H/Au:M/C:N/I:C/A:C) Base Score: 6.2 worst case
2381 Summary: If ntpd is configured to allow for remote configuration,
2382 and if the (possibly spoofed) source IP address is allowed to
2383 send remote configuration requests, and if the attacker knows
2384 the remote configuration password, it's possible for an attacker
2385 to use the "pidfile" or "driftfile" directives to potentially
2386 overwrite other files.
2389 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2390 Page or the NTP Public Services Project Download Page
2391 If you cannot upgrade, don't enable remote configuration.
2392 If you must enable remote configuration and cannot upgrade,
2393 remote configuration of NTF's ntpd requires:
2394 - an explicitly configured trustedkey, and you should also
2395 configure a controlkey.
2396 - access from a permitted IP. You choose the IPs.
2397 - authentication. Don't disable it. Practice secure key safety.
2398 Monitor your ntpd instances.
2399 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
2401 * Slow memory leak in CRYPTO_ASSOC
2403 References: Sec 2909 / CVE-2015-7701
2404 Affects: All ntp-4 releases that use autokey up to, but not
2405 including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
2406 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 0.0 best/usual case,
2408 Summary: If ntpd is configured to use autokey, then an attacker can
2409 send packets to ntpd that will, after several days of ongoing
2410 attack, cause it to run out of memory.
2413 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2414 Page or the NTP Public Services Project Download Page
2415 Monitor your ntpd instances.
2416 Credit: This weakness was discovered by Tenable Network Security.
2418 * mode 7 loop counter underrun
2420 References: Sec 2913 / CVE-2015-7848 / TALOS-CAN-0052
2421 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2422 and 4.3.0 up to, but not including 4.3.77
2423 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 4.6
2424 Summary: If ntpd is configured to enable mode 7 packets, and if the
2425 use of mode 7 packets is not properly protected thru the use of
2426 the available mode 7 authentication and restriction mechanisms,
2427 and if the (possibly spoofed) source IP address is allowed to
2428 send mode 7 queries, then an attacker can send a crafted packet
2429 to ntpd that will cause it to crash.
2432 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2433 Page or the NTP Public Services Project Download Page.
2434 If you are unable to upgrade:
2435 In ntp-4.2.8, mode 7 is disabled by default. Don't enable it.
2436 If you must enable mode 7:
2437 configure the use of a requestkey to control who can issue
2439 configure restrict noquery to further limit mode 7 requests
2441 Monitor your ntpd instances.
2442 Credit: This weakness was discovered by Aleksandar Nikolic of Cisco Talos.
2444 * memory corruption in password store
2446 References: Sec 2916 / CVE-2015-7849 / TALOS-CAN-0054
2447 Affects: All ntp-4 releases up to, but not including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
2448 CVSS: (AV:N/AC:H/Au:M/C:N/I:C/A:C) Base Score: 6.8, worst case
2449 Summary: If ntpd is configured to allow remote configuration, and if
2450 the (possibly spoofed) source IP address is allowed to send
2451 remote configuration requests, and if the attacker knows the
2452 remote configuration password or if ntpd was configured to
2453 disable authentication, then an attacker can send a set of
2454 packets to ntpd that may cause a crash or theoretically
2455 perform a code injection attack.
2458 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2459 Page or the NTP Public Services Project Download Page.
2460 If you are unable to upgrade, remote configuration of NTF's
2462 an explicitly configured "trusted" key. Only configure
2463 this if you need it.
2464 access from a permitted IP address. You choose the IPs.
2465 authentication. Don't disable it. Practice secure key safety.
2466 Monitor your ntpd instances.
2467 Credit: This weakness was discovered by Yves Younan of Cisco Talos.
2469 * Infinite loop if extended logging enabled and the logfile and
2470 keyfile are the same.
2472 References: Sec 2917 / CVE-2015-7850 / TALOS-CAN-0055
2473 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2474 and 4.3.0 up to, but not including 4.3.77
2475 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 4.6, worst case
2476 Summary: If ntpd is configured to allow remote configuration, and if
2477 the (possibly spoofed) source IP address is allowed to send
2478 remote configuration requests, and if the attacker knows the
2479 remote configuration password or if ntpd was configured to
2480 disable authentication, then an attacker can send a set of
2481 packets to ntpd that will cause it to crash and/or create a
2482 potentially huge log file. Specifically, the attacker could
2483 enable extended logging, point the key file at the log file,
2484 and cause what amounts to an infinite loop.
2487 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2488 Page or the NTP Public Services Project Download Page.
2489 If you are unable to upgrade, remote configuration of NTF's ntpd
2491 an explicitly configured "trusted" key. Only configure this
2493 access from a permitted IP address. You choose the IPs.
2494 authentication. Don't disable it. Practice secure key safety.
2495 Monitor your ntpd instances.
2496 Credit: This weakness was discovered by Yves Younan of Cisco Talos.
2498 * Potential path traversal vulnerability in the config file saving of
2501 References: Sec 2918 / CVE-2015-7851 / TALOS-CAN-0062
2502 Affects: All ntp-4 releases running under VMS up to, but not
2503 including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
2504 CVSS: (AV:N/AC:H/Au:M/C:N/I:P/A:C) Base Score: 5.2, worst case
2505 Summary: If ntpd is configured to allow remote configuration, and if
2506 the (possibly spoofed) IP address is allowed to send remote
2507 configuration requests, and if the attacker knows the remote
2508 configuration password or if ntpd was configured to disable
2509 authentication, then an attacker can send a set of packets to
2510 ntpd that may cause ntpd to overwrite files.
2513 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2514 Page or the NTP Public Services Project Download Page.
2515 If you are unable to upgrade, remote configuration of NTF's ntpd
2517 an explicitly configured "trusted" key. Only configure
2518 this if you need it.
2519 access from permitted IP addresses. You choose the IPs.
2520 authentication. Don't disable it. Practice key security safety.
2521 Monitor your ntpd instances.
2522 Credit: This weakness was discovered by Yves Younan of Cisco Talos.
2524 * ntpq atoascii() potential memory corruption
2526 References: Sec 2919 / CVE-2015-7852 / TALOS-CAN-0063
2527 Affects: All ntp-4 releases running up to, but not including 4.2.8p4,
2528 and 4.3.0 up to, but not including 4.3.77
2529 CVSS: (AV:N/AC:H/Au:N/C:N/I:P/A:P) Base Score: 4.0, worst case
2530 Summary: If an attacker can figure out the precise moment that ntpq
2531 is listening for data and the port number it is listening on or
2532 if the attacker can provide a malicious instance ntpd that
2533 victims will connect to then an attacker can send a set of
2534 crafted mode 6 response packets that, if received by ntpq,
2535 can cause ntpq to crash.
2538 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2539 Page or the NTP Public Services Project Download Page.
2540 If you are unable to upgrade and you run ntpq against a server
2541 and ntpq crashes, try again using raw mode. Build or get a
2542 patched ntpq and see if that fixes the problem. Report new
2543 bugs in ntpq or abusive servers appropriately.
2544 If you use ntpq in scripts, make sure ntpq does what you expect
2546 Credit: This weakness was discovered by Yves Younan and
2547 Aleksander Nikolich of Cisco Talos.
2549 * Invalid length data provided by a custom refclock driver could cause
2552 References: Sec 2920 / CVE-2015-7853 / TALOS-CAN-0064
2553 Affects: Potentially all ntp-4 releases running up to, but not
2554 including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
2555 that have custom refclocks
2556 CVSS: (AV:L/AC:H/Au:M/C:C/I:C/A:C) Base Score: 0.0 usual case,
2557 5.9 unusual worst case
2558 Summary: A negative value for the datalen parameter will overflow a
2559 data buffer. NTF's ntpd driver implementations always set this
2560 value to 0 and are therefore not vulnerable to this weakness.
2561 If you are running a custom refclock driver in ntpd and that
2562 driver supplies a negative value for datalen (no custom driver
2563 of even minimal competence would do this) then ntpd would
2564 overflow a data buffer. It is even hypothetically possible
2565 in this case that instead of simply crashing ntpd the attacker
2566 could effect a code injection attack.
2568 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2569 Page or the NTP Public Services Project Download Page.
2570 If you are unable to upgrade:
2571 If you are running custom refclock drivers, make sure
2572 the signed datalen value is either zero or positive.
2573 Monitor your ntpd instances.
2574 Credit: This weakness was discovered by Yves Younan of Cisco Talos.
2576 * Password Length Memory Corruption Vulnerability
2578 References: Sec 2921 / CVE-2015-7854 / TALOS-CAN-0065
2579 Affects: All ntp-4 releases up to, but not including 4.2.8p4, and
2580 4.3.0 up to, but not including 4.3.77
2581 CVSS: (AV:N/AC:H/Au:M/C:C/I:C/A:C) Base Score: 0.0 best case,
2582 1.7 usual case, 6.8, worst case
2583 Summary: If ntpd is configured to allow remote configuration, and if
2584 the (possibly spoofed) source IP address is allowed to send
2585 remote configuration requests, and if the attacker knows the
2586 remote configuration password or if ntpd was (foolishly)
2587 configured to disable authentication, then an attacker can
2588 send a set of packets to ntpd that may cause it to crash,
2589 with the hypothetical possibility of a small code injection.
2592 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2593 Page or the NTP Public Services Project Download Page.
2594 If you are unable to upgrade, remote configuration of NTF's
2596 an explicitly configured "trusted" key. Only configure
2597 this if you need it.
2598 access from a permitted IP address. You choose the IPs.
2599 authentication. Don't disable it. Practice secure key safety.
2600 Monitor your ntpd instances.
2601 Credit: This weakness was discovered by Yves Younan and
2602 Aleksander Nikolich of Cisco Talos.
2604 * decodenetnum() will ASSERT botch instead of returning FAIL on some
2607 References: Sec 2922 / CVE-2015-7855
2608 Affects: All ntp-4 releases up to, but not including 4.2.8p4, and
2609 4.3.0 up to, but not including 4.3.77
2610 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 4.6, worst case
2611 Summary: If ntpd is fed a crafted mode 6 or mode 7 packet containing
2612 an unusually long data value where a network address is expected,
2613 the decodenetnum() function will abort with an assertion failure
2614 instead of simply returning a failure condition.
2617 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2618 Page or the NTP Public Services Project Download Page.
2619 If you are unable to upgrade:
2620 mode 7 is disabled by default. Don't enable it.
2621 Use restrict noquery to limit who can send mode 6
2622 and mode 7 requests.
2623 Configure and use the controlkey and requestkey
2624 authentication directives to limit who can
2625 send mode 6 and mode 7 requests.
2626 Monitor your ntpd instances.
2627 Credit: This weakness was discovered by John D "Doug" Birdwell of IDA.org.
2629 * NAK to the Future: Symmetric association authentication bypass via
2632 References: Sec 2941 / CVE-2015-7871
2633 Affects: All ntp-4 releases between 4.2.5p186 up to but not including
2634 4.2.8p4, and 4.3.0 up to but not including 4.3.77
2635 CVSS: (AV:N/AC:L/Au:N/C:N/I:P/A:P) Base Score: 6.4
2636 Summary: Crypto-NAK packets can be used to cause ntpd to accept time
2637 from unauthenticated ephemeral symmetric peers by bypassing the
2638 authentication required to mobilize peer associations. This
2639 vulnerability appears to have been introduced in ntp-4.2.5p186
2640 when the code handling mobilization of new passive symmetric
2641 associations (lines 1103-1165) was refactored.
2644 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2645 Page or the NTP Public Services Project Download Page.
2646 If you are unable to upgrade:
2647 Apply the patch to the bottom of the "authentic" check
2648 block around line 1136 of ntp_proto.c.
2649 Monitor your ntpd instances.
2650 Credit: This weakness was discovered by Matthew Van Gundy of Cisco ASIG.
2652 Backward-Incompatible changes:
2653 * [Bug 2817] Default on Linux is now "rlimit memlock -1".
2654 While the general default of 32M is still the case, under Linux
2655 the default value has been changed to -1 (do not lock ntpd into
2656 memory). A value of 0 means "lock ntpd into memory with whatever
2657 memory it needs." If your ntp.conf file has an explicit "rlimit memlock"
2658 value in it, that value will continue to be used.
2660 * [Bug 2886] Misspelling: "outlyer" should be "outlier".
2661 If you've written a script that looks for this case in, say, the
2662 output of ntpq, you probably want to change your regex matches
2663 from 'outlyer' to 'outl[iy]er'.
2665 New features in this release:
2666 * 'rlimit memlock' now has finer-grained control. A value of -1 means
2667 "don't lock ntpd into memore". This is the default for Linux boxes.
2668 A value of 0 means "lock ntpd into memory" with no limits. Otherwise
2669 the value is the number of megabytes of memory to lock. The default
2672 * The old Google Test framework has been replaced with a new framework,
2673 based on http://www.throwtheswitch.org/unity/ .
2675 Bug Fixes and Improvements:
2676 * [Bug 2332] (reopened) Exercise thread cancellation once before dropping
2677 privileges and limiting resources in NTPD removes the need to link
2678 forcefully against 'libgcc_s' which does not always work. J.Perlinger
2679 * [Bug 2595] ntpdate man page quirks. Hal Murray, Harlan Stenn.
2680 * [Bug 2625] Deprecate flag1 in local refclock. Hal Murray, Harlan Stenn.
2681 * [Bug 2817] Stop locking ntpd into memory by default under Linux. H.Stenn.
2682 * [Bug 2821] minor build issues: fixed refclock_gpsdjson.c. perlinger@ntp.org
2683 * [Bug 2823] ntpsweep with recursive peers option doesn't work. H.Stenn.
2684 * [Bug 2849] Systems with more than one default route may never
2685 synchronize. Brian Utterback. Note that this patch might need to
2686 be reverted once Bug 2043 has been fixed.
2687 * [Bug 2864] 4.2.8p3 fails to compile on Windows. Juergen Perlinger
2688 * [Bug 2866] segmentation fault at initgroups(). Harlan Stenn.
2689 * [Bug 2867] ntpd with autokey active crashed by 'ntpq -crv'. J.Perlinger
2690 * [Bug 2873] libevent should not include .deps/ in the tarball. H.Stenn
2691 * [Bug 2874] Don't distribute generated sntp/tests/fileHandlingTest.h. H.Stenn
2692 * [Bug 2875] sntp/Makefile.am: Get rid of DIST_SUBDIRS. libevent must
2693 be configured for the distribution targets. Harlan Stenn.
2694 * [Bug 2883] ntpd crashes on exit with empty driftfile. Miroslav Lichvar.
2695 * [Bug 2886] Mis-spelling: "outlyer" should be "outlier". dave@horsfall.org
2696 * [Bug 2888] streamline calendar functions. perlinger@ntp.org
2697 * [Bug 2889] ntp-dev-4.3.67 does not build on Windows. perlinger@ntp.org
2698 * [Bug 2890] Ignore ENOBUFS on routing netlink socket. Konstantin Khlebnikov.
2699 * [Bug 2906] make check needs better support for pthreads. Harlan Stenn.
2700 * [Bug 2907] dist* build targets require our libevent/ to be enabled. HStenn.
2701 * [Bug 2912] no munlockall() under Windows. David Taylor, Harlan Stenn.
2702 * libntp/emalloc.c: Remove explicit include of stdint.h. Harlan Stenn.
2703 * Put Unity CPPFLAGS items in unity_config.h. Harlan Stenn.
2704 * tests/ntpd/g_leapsec.cpp typo fix. Harlan Stenn.
2705 * Phase 1 deprecation of google test in sntp/tests/. Harlan Stenn.
2706 * On some versions of HP-UX, inttypes.h does not include stdint.h. H.Stenn.
2707 * top_srcdir can change based on ntp v. sntp. Harlan Stenn.
2708 * sntp/tests/ function parameter list cleanup. Damir Tomić.
2709 * tests/libntp/ function parameter list cleanup. Damir Tomić.
2710 * tests/ntpd/ function parameter list cleanup. Damir Tomić.
2711 * sntp/unity/unity_config.h: handle stdint.h. Harlan Stenn.
2712 * sntp/unity/unity_internals.h: handle *INTPTR_MAX on old Solaris. H.Stenn.
2713 * tests/libntp/timevalops.c and timespecops.c fixed error printing. D.Tomić.
2714 * tests/libntp/ improvements in code and fixed error printing. Damir Tomić.
2715 * tests/libntp: a_md5encrypt.c, authkeys.c, buftvtots.c, calendar.c, caljulian.c,
2716 caltontp.c, clocktime.c, humandate.c, hextolfp.c, decodenetnum.c - fixed
2717 formatting; first declaration, then code (C90); deleted unnecessary comments;
2718 changed from sprintf to snprintf; fixed order of includes. Tomasz Flendrich
2719 * tests/libntp/lfpfunc.c remove unnecessary include, remove old comments,
2720 fix formatting, cleanup. Tomasz Flendrich
2721 * tests/libntp/lfptostr.c remove unnecessary include, add consts, fix formatting.
2723 * tests/libntp/statestr.c remove empty functions, remove unnecessary include,
2724 fix formatting. Tomasz Flendrich
2725 * tests/libntp/modetoa.c fixed formatting. Tomasz Flendrich
2726 * tests/libntp/msyslog.c fixed formatting. Tomasz Flendrich
2727 * tests/libntp/numtoa.c deleted unnecessary empty functions, fixed formatting.
2729 * tests/libntp/numtohost.c added const, fixed formatting. Tomasz Flendrich
2730 * tests/libntp/refnumtoa.c fixed formatting. Tomasz Flendrich
2731 * tests/libntp/ssl_init.c fixed formatting. Tomasz Flendrich
2732 * tests/libntp/tvtots.c fixed a bug, fixed formatting. Tomasz Flendrich
2733 * tests/libntp/uglydate.c removed an unnecessary include. Tomasz Flendrich
2734 * tests/libntp/vi64ops.c removed an unnecessary comment, fixed formatting.
2735 * tests/libntp/ymd3yd.c removed an empty function and an unnecessary include,
2736 fixed formatting. Tomasz Flendrich
2737 * tests/libntp/timespecops.c fixed formatting, fixed the order of includes,
2738 removed unnecessary comments, cleanup. Tomasz Flendrich
2739 * tests/libntp/timevalops.c fixed the order of includes, deleted unnecessary
2740 comments, cleanup. Tomasz Flendrich
2741 * tests/libntp/sockaddrtest.h making it agree to NTP's conventions of formatting.
2743 * tests/libntp/lfptest.h cleanup. Tomasz Flendrich
2744 * tests/libntp/test-libntp.c fix formatting. Tomasz Flendrich
2745 * sntp/tests/crypto.c is now using proper Unity's assertions, fixed formatting.
2747 * sntp/tests/kodDatabase.c added consts, deleted empty function,
2748 fixed formatting. Tomasz Flendrich
2749 * sntp/tests/kodFile.c cleanup, fixed formatting. Tomasz Flendrich
2750 * sntp/tests/packetHandling.c is now using proper Unity's assertions,
2751 fixed formatting, deleted unused variable. Tomasz Flendrich
2752 * sntp/tests/keyFile.c is now using proper Unity's assertions, fixed formatting.
2754 * sntp/tests/packetProcessing.c changed from sprintf to snprintf,
2755 fixed formatting. Tomasz Flendrich
2756 * sntp/tests/utilities.c is now using proper Unity's assertions, changed
2757 the order of includes, fixed formatting, removed unnecessary comments.
2759 * sntp/tests/sntptest.h fixed formatting. Tomasz Flendrich
2760 * sntp/tests/fileHandlingTest.h.in fixed a possible buffer overflow problem,
2761 made one function do its job, deleted unnecessary prints, fixed formatting.
2763 * sntp/unity/Makefile.am added a missing header. Tomasz Flendrich
2764 * sntp/unity/unity_config.h: Distribute it. Harlan Stenn.
2765 * sntp/libevent/evconfig-private.h: remove generated filefrom SCM. H.Stenn.
2766 * sntp/unity/Makefile.am: fix some broken paths. Harlan Stenn.
2767 * sntp/unity/unity.c: Clean up a printf(). Harlan Stenn.
2768 * Phase 1 deprecation of google test in tests/libntp/. Harlan Stenn.
2769 * Don't build sntp/libevent/sample/. Harlan Stenn.
2770 * tests/libntp/test_caltontp needs -lpthread. Harlan Stenn.
2771 * br-flock: --enable-local-libevent. Harlan Stenn.
2772 * Wrote tests for ntpd/ntp_prio_q.c. Tomasz Flendrich
2773 * scripts/lib/NTP/Util.pm: stratum output is version-dependent. Harlan Stenn.
2774 * Get rid of the NTP_ prefix on our assertion macros. Harlan Stenn.
2775 * Code cleanup. Harlan Stenn.
2776 * libntp/icom.c: Typo fix. Harlan Stenn.
2777 * util/ntptime.c: initialization nit. Harlan Stenn.
2778 * ntpd/ntp_peer.c:newpeer(): added a DEBUG_REQUIRE(srcadr). Harlan Stenn.
2779 * Add std_unity_tests to various Makefile.am files. Harlan Stenn.
2780 * ntpd/ntp_restrict.c: added a few assertions, created tests for this file.
2782 * Changed progname to be const in many files - now it's consistent. Tomasz
2784 * Typo fix for GCC warning suppression. Harlan Stenn.
2785 * Added tests/ntpd/ntp_scanner.c test. Damir Tomić.
2786 * Added declarations to all Unity tests, and did minor fixes to them.
2787 Reduced the number of warnings by half. Damir Tomić.
2788 * Updated generate_test_runner.rb and updated the sntp/unity/auto directory
2789 with the latest Unity updates from Mark. Damir Tomić.
2790 * Retire google test - phase I. Harlan Stenn.
2791 * Unity test cleanup: move declaration of 'initializing'. Harlan Stenn.
2792 * Update the NEWS file. Harlan Stenn.
2793 * Autoconf cleanup. Harlan Stenn.
2794 * Unit test dist cleanup. Harlan Stenn.
2795 * Cleanup various test Makefile.am files. Harlan Stenn.
2796 * Pthread autoconf macro cleanup. Harlan Stenn.
2797 * Fix progname definition in unity runner scripts. Harlan Stenn.
2798 * Clean trailing whitespace in tests/ntpd/Makefile.am. Harlan Stenn.
2799 * Update the patch for bug 2817. Harlan Stenn.
2800 * More updates for bug 2817. Harlan Stenn.
2801 * Fix bugs in tests/ntpd/ntp_prio_q.c. Harlan Stenn.
2802 * gcc on older HPUX may need +allowdups. Harlan Stenn.
2803 * Adding missing MCAST protection. Harlan Stenn.
2804 * Disable certain test programs on certain platforms. Harlan Stenn.
2805 * Implement --enable-problem-tests (on by default). Harlan Stenn.
2806 * build system tweaks. Harlan Stenn.
2809 NTP 4.2.8p3 (Harlan Stenn <stenn@ntp.org>, 2015/06/29)
2811 Focus: 1 Security fix. Bug fixes and enhancements. Leap-second improvements.
2817 * [Sec 2853] Crafted remote config packet can crash some versions of
2818 ntpd. Aleksis Kauppinen, Juergen Perlinger, Harlan Stenn.
2820 Under specific circumstances an attacker can send a crafted packet to
2821 cause a vulnerable ntpd instance to crash. This requires each of the
2822 following to be true:
2824 1) ntpd set up to allow remote configuration (not allowed by default), and
2825 2) knowledge of the configuration password, and
2826 3) access to a computer entrusted to perform remote configuration.
2828 This vulnerability is considered low-risk.
2830 New features in this release:
2832 Optional (disabled by default) support to have ntpd provide smeared
2833 leap second time. A specially built and configured ntpd will only
2834 offer smeared time in response to client packets. These response
2835 packets will also contain a "refid" of 254.a.b.c, where the 24 bits
2836 of a, b, and c encode the amount of smear in a 2:22 integer:fraction
2837 format. See README.leapsmear and http://bugs.ntp.org/2855 for more
2840 *IF YOU CHOOSE TO CONFIGURE NTPD TO PROVIDE LEAP SMEAR TIME*
2841 *BE SURE YOU DO NOT OFFER THAT TIME ON PUBLIC TIMESERVERS.*
2843 We've imported the Unity test framework, and have begun converting
2844 the existing google-test items to this new framework. If you want
2845 to write new tests or change old ones, you'll need to have ruby
2846 installed. You don't need ruby to run the test suite.
2848 Bug Fixes and Improvements:
2850 * CID 739725: Fix a rare resource leak in libevent/listener.c.
2851 * CID 1295478: Quiet a pedantic potential error from the fix for Bug 2776.
2852 * CID 1296235: Fix refclock_jjy.c and correcting type of the driver40-ja.html
2853 * CID 1269537: Clean up a line of dead code in getShmTime().
2854 * [Bug 1060] Buffer overruns in libparse/clk_rawdcf.c. Helge Oldach.
2855 * [Bug 2590] autogen-5.18.5.
2856 * [Bug 2612] restrict: Warn when 'monitor' can't be disabled because
2858 * [Bug 2650] fix includefile processing.
2859 * [Bug 2745] ntpd -x steps clock on leap second
2860 Fixed an initial-value problem that caused misbehaviour in absence of
2861 any leapsecond information.
2862 Do leap second stepping only of the step adjustment is beyond the
2863 proper jump distance limit and step correction is allowed at all.
2864 * [Bug 2750] build for Win64
2865 Building for 32bit of loopback ppsapi needs def file
2866 * [Bug 2776] Improve ntpq's 'help keytype'.
2867 * [Bug 2778] Implement "apeers" ntpq command to include associd.
2868 * [Bug 2782] Refactor refclock_shm.c, add memory barrier protection.
2869 * [Bug 2792] If the IFF_RUNNING interface flag is supported then an
2870 interface is ignored as long as this flag is not set since the
2871 interface is not usable (e.g., no link).
2872 * [Bug 2794] Clean up kernel clock status reports.
2873 * [Bug 2800] refclock_true.c true_debug() can't open debug log because
2874 of incompatible open/fdopen parameters.
2875 * [Bug 2804] install-local-data assumes GNU 'find' semantics.
2876 * [Bug 2805] ntpd fails to join multicast group.
2877 * [Bug 2806] refclock_jjy.c supports the Telephone JJY.
2878 * [Bug 2808] GPSD_JSON driver enhancements, step 1.
2879 Fix crash during cleanup if GPS device not present and char device.
2880 Increase internal token buffer to parse all JSON data, even SKY.
2881 Defer logging of errors during driver init until the first unit is
2882 started, so the syslog is not cluttered when the driver is not used.
2883 Various improvements, see http://bugs.ntp.org/2808 for details.
2884 Changed libjsmn to a more recent version.
2885 * [Bug 2810] refclock_shm.c memory barrier code needs tweaks for QNX.
2886 * [Bug 2813] HP-UX needs -D__STDC_VERSION__=199901L and limits.h.
2887 * [Bug 2815] net-snmp before v5.4 has circular library dependencies.
2888 * [Bug 2821] Add a missing NTP_PRINTF and a missing const.
2889 * [Bug 2822] New leap column in sntp broke NTP::Util.pm.
2890 * [Bug 2824] Convert update-leap to perl. (also see 2769)
2891 * [Bug 2825] Quiet file installation in html/ .
2892 * [Bug 2830] ntpd doesn't always transfer the correct TAI offset via autokey
2893 NTPD transfers the current TAI (instead of an announcement) now.
2894 This might still needed improvement.
2895 Update autokey data ASAP when 'sys_tai' changes.
2896 Fix unit test that was broken by changes for autokey update.
2897 Avoid potential signature length issue and use DPRINTF where possible
2899 * [Bug 2832] refclock_jjy.c supports the TDC-300.
2900 * [Bug 2834] Correct a broken html tag in html/refclock.html
2901 * [Bug 2836] DFC77 patches from Frank Kardel to make decoding more
2902 robust, and require 2 consecutive timestamps to be consistent.
2903 * [Bug 2837] Allow a configurable DSCP value.
2904 * [Bug 2837] add test for DSCP to ntpd/complete.conf.in
2905 * [Bug 2842] Glitch in ntp.conf.def documentation stanza.
2906 * [Bug 2842] Bug in mdoc2man.
2907 * [Bug 2843] make check fails on 4.3.36
2908 Fixed compiler warnings about numeric range overflow
2909 (The original topic was fixed in a byplay to bug#2830)
2910 * [Bug 2845] Harden memory allocation in ntpd.
2911 * [Bug 2852] 'make check' can't find unity.h. Hal Murray.
2912 * [Bug 2854] Missing brace in libntp/strdup.c. Masanari Iida.
2913 * [Bug 2855] Parser fix for conditional leap smear code. Harlan Stenn.
2914 * [Bug 2855] Report leap smear in the REFID. Harlan Stenn.
2915 * [Bug 2855] Implement conditional leap smear code. Martin Burnicki.
2916 * [Bug 2856] ntpd should wait() on terminated child processes. Paul Green.
2917 * [Bug 2857] Stratus VOS does not support SIGIO. Paul Green.
2918 * [Bug 2859] Improve raw DCF77 robustness deconding. Frank Kardel.
2919 * [Bug 2860] ntpq ifstats sanity check is too stringent. Frank Kardel.
2920 * html/drivers/driver22.html: typo fix. Harlan Stenn.
2921 * refidsmear test cleanup. Tomasz Flendrich.
2922 * refidsmear function support and tests. Harlan Stenn.
2923 * sntp/tests/Makefile.am: remove g_nameresolution.cpp as it tested
2924 something that was only in the 4.2.6 sntp. Harlan Stenn.
2925 * Modified tests/bug-2803/Makefile.am so it builds Unity framework tests.
2927 * Modified tests/libtnp/Makefile.am so it builds Unity framework tests.
2929 * Modified sntp/tests/Makefile.am so it builds Unity framework tests.
2931 * tests/sandbox/smeartest.c: Harlan Stenn, Damir Tomic, Juergen Perlinger.
2932 * Converted from gtest to Unity: tests/bug-2803/. Damir Tomić
2933 * Converted from gtest to Unity: tests/libntp/ a_md5encrypt, atoint.c,
2934 atouint.c, authkeys.c, buftvtots.c, calendar.c, caljulian.c,
2935 calyearstart.c, clocktime.c, hextoint.c, lfpfunc.c, modetoa.c,
2936 numtoa.c, numtohost.c, refnumtoa.c, ssl_init.c, statestr.c,
2937 timespecops.c, timevalops.c, uglydate.c, vi64ops.c, ymd2yd.c.
2939 * Converted from gtest to Unity: sntp/tests/ kodDatabase.c, kodFile.c,
2940 networking.c, keyFile.c, utilities.cpp, sntptest.h,
2941 fileHandlingTest.h. Damir Tomić
2942 * Initial support for experimental leap smear code. Harlan Stenn.
2943 * Fixes to sntp/tests/fileHandlingTest.h.in. Harlan Stenn.
2944 * Report select() debug messages at debug level 3 now.
2945 * sntp/scripts/genLocInfo: treat raspbian as debian.
2946 * Unity test framework fixes.
2947 ** Requires ruby for changes to tests.
2948 * Initial support for PACKAGE_VERSION tests.
2949 * sntp/libpkgver belongs in EXTRA_DIST, not DIST_SUBDIRS.
2950 * tests/bug-2803/Makefile.am must distribute bug-2803.h.
2951 * Add an assert to the ntpq ifstats code.
2952 * Clean up the RLIMIT_STACK code.
2953 * Improve the ntpq documentation around the controlkey keyid.
2955 * Windows port build cleanup.
2958 NTP 4.2.8p2 (Harlan Stenn <stenn@ntp.org>, 2015/04/07)
2960 Focus: Security and Bug fixes, enhancements.
2964 In addition to bug fixes and enhancements, this release fixes the
2965 following medium-severity vulnerabilities involving private key
2968 * [Sec 2779] ntpd accepts unauthenticated packets with symmetric key crypto.
2970 References: Sec 2779 / CVE-2015-1798 / VU#374268
2971 Affects: All NTP4 releases starting with ntp-4.2.5p99 up to but not
2972 including ntp-4.2.8p2 where the installation uses symmetric keys
2973 to authenticate remote associations.
2974 CVSS: (AV:A/AC:M/Au:N/C:P/I:P/A:P) Base Score: 5.4
2975 Date Resolved: Stable (4.2.8p2) 07 Apr 2015
2976 Summary: When ntpd is configured to use a symmetric key to authenticate
2977 a remote NTP server/peer, it checks if the NTP message
2978 authentication code (MAC) in received packets is valid, but not if
2979 there actually is any MAC included. Packets without a MAC are
2980 accepted as if they had a valid MAC. This allows a MITM attacker to
2981 send false packets that are accepted by the client/peer without
2982 having to know the symmetric key. The attacker needs to know the
2983 transmit timestamp of the client to match it in the forged reply
2984 and the false reply needs to reach the client before the genuine
2985 reply from the server. The attacker doesn't necessarily need to be
2986 relaying the packets between the client and the server.
2988 Authentication using autokey doesn't have this problem as there is
2989 a check that requires the key ID to be larger than NTP_MAXKEY,
2990 which fails for packets without a MAC.
2992 Upgrade to 4.2.8p2, or later, from the NTP Project Download Page
2993 or the NTP Public Services Project Download Page
2994 Configure ntpd with enough time sources and monitor it properly.
2995 Credit: This issue was discovered by Miroslav Lichvar, of Red Hat.
2997 * [Sec 2781] Authentication doesn't protect symmetric associations against
3000 References: Sec 2781 / CVE-2015-1799 / VU#374268
3001 Affects: All NTP releases starting with at least xntp3.3wy up to but
3002 not including ntp-4.2.8p2 where the installation uses symmetric
3004 CVSS: (AV:A/AC:M/Au:N/C:P/I:P/A:P) Base Score: 5.4
3005 Note: the CVSS base Score for this issue could be 4.3 or lower, and
3006 it could be higher than 5.4.
3007 Date Resolved: Stable (4.2.8p2) 07 Apr 2015
3008 Summary: An attacker knowing that NTP hosts A and B are peering with
3009 each other (symmetric association) can send a packet to host A
3010 with source address of B which will set the NTP state variables
3011 on A to the values sent by the attacker. Host A will then send
3012 on its next poll to B a packet with originate timestamp that
3013 doesn't match the transmit timestamp of B and the packet will
3014 be dropped. If the attacker does this periodically for both
3015 hosts, they won't be able to synchronize to each other. This is
3016 a known denial-of-service attack, described at
3017 https://www.eecis.udel.edu/~mills/onwire.html .
3019 According to the document the NTP authentication is supposed to
3020 protect symmetric associations against this attack, but that
3021 doesn't seem to be the case. The state variables are updated even
3022 when authentication fails and the peers are sending packets with
3023 originate timestamps that don't match the transmit timestamps on
3026 This seems to be a very old problem, dating back to at least
3027 xntp3.3wy. It's also in the NTPv3 (RFC 1305) and NTPv4 (RFC 5905)
3028 specifications, so other NTP implementations with support for
3029 symmetric associations and authentication may be vulnerable too.
3030 An update to the NTP RFC to correct this error is in-process.
3032 Upgrade to 4.2.8p2, or later, from the NTP Project Download Page
3033 or the NTP Public Services Project Download Page
3034 Note that for users of autokey, this specific style of MITM attack
3035 is simply a long-known potential problem.
3036 Configure ntpd with appropriate time sources and monitor ntpd.
3037 Alert your staff if problems are detected.
3038 Credit: This issue was discovered by Miroslav Lichvar, of Red Hat.
3040 * New script: update-leap
3041 The update-leap script will verify and if necessary, update the
3042 leap-second definition file.
3043 It requires the following commands in order to work:
3045 wget logger tr sed shasum
3047 Some may choose to run this from cron. It needs more portability testing.
3049 Bug Fixes and Improvements:
3051 * [Bug 1787] DCF77's formerly "antenna" bit is "call bit" since 2003.
3052 * [Bug 1960] setsockopt IPV6_MULTICAST_IF: Invalid argument.
3053 * [Bug 2346] "graceful termination" signals do not do peer cleanup.
3054 * [Bug 2728] See if C99-style structure initialization works.
3055 * [Bug 2747] Upgrade libevent to 2.1.5-beta.
3056 * [Bug 2749] ntp/lib/NTP/Util.pm needs update for ntpq -w, IPv6, .POOL. .
3057 * [Bug 2751] jitter.h has stale copies of l_fp macros.
3058 * [Bug 2756] ntpd hangs in startup with gcc 3.3.5 on ARM.
3059 * [Bug 2757] Quiet compiler warnings.
3060 * [Bug 2759] Expose nonvolatile/clk_wander_threshold to ntpq.
3061 * [Bug 2763] Allow different thresholds for forward and backward steps.
3062 * [Bug 2766] ntp-keygen output files should not be world-readable.
3063 * [Bug 2767] ntp-keygen -M should symlink to ntp.keys.
3064 * [Bug 2771] nonvolatile value is documented in wrong units.
3065 * [Bug 2773] Early leap announcement from Palisade/Thunderbolt
3066 * [Bug 2774] Unreasonably verbose printout - leap pending/warning
3067 * [Bug 2775] ntp-keygen.c fails to compile under Windows.
3068 * [Bug 2777] Fixed loops and decoding of Meinberg GPS satellite info.
3069 Removed non-ASCII characters from some copyright comments.
3070 Removed trailing whitespace.
3071 Updated definitions for Meinberg clocks from current Meinberg header files.
3072 Now use C99 fixed-width types and avoid non-ASCII characters in comments.
3073 Account for updated definitions pulled from Meinberg header files.
3074 Updated comments on Meinberg GPS receivers which are not only called GPS16x.
3075 Replaced some constant numbers by defines from ntp_calendar.h
3076 Modified creation of parse-specific variables for Meinberg devices
3077 in gps16x_message().
3078 Reworked mk_utcinfo() to avoid printing of ambiguous leap second dates.
3079 Modified mbg_tm_str() which now expexts an additional parameter controlling
3080 if the time status shall be printed.
3081 * [Sec 2779] ntpd accepts unauthenticated packets with symmetric key crypto.
3082 * [Sec 2781] Authentication doesn't protect symmetric associations against
3084 * [Bug 2783] Quiet autoconf warnings about missing AC_LANG_SOURCE.
3085 * [Bug 2789] Quiet compiler warnings from libevent.
3086 * [Bug 2790] If ntpd sets the Windows MM timer highest resolution
3087 pause briefly before measuring system clock precision to yield
3089 * Comment from Juergen Perlinger in ntp_calendar.c to make the code clearer.
3090 * Use predefined function types for parse driver functions
3091 used to set up function pointers.
3092 Account for changed prototype of parse_inp_fnc_t functions.
3093 Cast parse conversion results to appropriate types to avoid
3095 Let ioctl() for Windows accept a (void *) to avoid compiler warnings
3096 when called with pointers to different types.
3099 NTP 4.2.8p1 (Harlan Stenn <stenn@ntp.org>, 2015/02/04)
3101 Focus: Security and Bug fixes, enhancements.
3105 In addition to bug fixes and enhancements, this release fixes the
3106 following high-severity vulnerabilities:
3108 * vallen is not validated in several places in ntp_crypto.c, leading
3109 to a potential information leak or possibly a crash
3111 References: Sec 2671 / CVE-2014-9297 / VU#852879
3112 Affects: All NTP4 releases before 4.2.8p1 that are running autokey.
3113 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
3114 Date Resolved: Stable (4.2.8p1) 04 Feb 2015
3115 Summary: The vallen packet value is not validated in several code
3116 paths in ntp_crypto.c which can lead to information leakage
3117 or perhaps a crash of the ntpd process.
3118 Mitigation - any of:
3119 Upgrade to 4.2.8p1, or later, from the NTP Project Download Page
3120 or the NTP Public Services Project Download Page.
3121 Disable Autokey Authentication by removing, or commenting out,
3122 all configuration directives beginning with the "crypto"
3123 keyword in your ntp.conf file.
3124 Credit: This vulnerability was discovered by Stephen Roettger of the
3125 Google Security Team, with additional cases found by Sebastian
3126 Krahmer of the SUSE Security Team and Harlan Stenn of Network
3129 * ::1 can be spoofed on some OSes, so ACLs based on IPv6 ::1 addresses
3132 References: Sec 2672 / CVE-2014-9298 / VU#852879
3133 Affects: All NTP4 releases before 4.2.8p1, under at least some
3134 versions of MacOS and Linux. *BSD has not been seen to be vulnerable.
3135 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:C) Base Score: 9
3136 Date Resolved: Stable (4.2.8p1) 04 Feb 2014
3137 Summary: While available kernels will prevent 127.0.0.1 addresses
3138 from "appearing" on non-localhost IPv4 interfaces, some kernels
3139 do not offer the same protection for ::1 source addresses on
3140 IPv6 interfaces. Since NTP's access control is based on source
3141 address and localhost addresses generally have no restrictions,
3142 an attacker can send malicious control and configuration packets
3143 by spoofing ::1 addresses from the outside. Note Well: This is
3144 not really a bug in NTP, it's a problem with some OSes. If you
3145 have one of these OSes where ::1 can be spoofed, ALL ::1 -based
3146 ACL restrictions on any application can be bypassed!
3148 Upgrade to 4.2.8p1, or later, from the NTP Project Download Page
3149 or the NTP Public Services Project Download Page
3150 Install firewall rules to block packets claiming to come from
3151 ::1 from inappropriate network interfaces.
3152 Credit: This vulnerability was discovered by Stephen Roettger of
3153 the Google Security Team.
3155 Additionally, over 30 bugfixes and improvements were made to the codebase.
3156 See the ChangeLog for more information.
3159 NTP 4.2.8 (Harlan Stenn <stenn@ntp.org>, 2014/12/18)
3161 Focus: Security and Bug fixes, enhancements.
3165 In addition to bug fixes and enhancements, this release fixes the
3166 following high-severity vulnerabilities:
3168 ************************** vv NOTE WELL vv *****************************
3170 The vulnerabilities listed below can be significantly mitigated by
3171 following the BCP of putting
3173 restrict default ... noquery
3175 in the ntp.conf file. With the exception of:
3177 receive(): missing return on error
3178 References: Sec 2670 / CVE-2014-9296 / VU#852879
3180 below (which is a limited-risk vulnerability), none of the recent
3181 vulnerabilities listed below can be exploited if the source IP is
3182 restricted from sending a 'query'-class packet by your ntp.conf file.
3184 ************************** ^^ NOTE WELL ^^ *****************************
3186 * Weak default key in config_auth().
3188 References: [Sec 2665] / CVE-2014-9293 / VU#852879
3189 CVSS: (AV:N/AC:L/Au:M/C:P/I:P/A:C) Base Score: 7.3
3190 Vulnerable Versions: all releases prior to 4.2.7p11
3191 Date Resolved: 28 Jan 2010
3193 Summary: If no 'auth' key is set in the configuration file, ntpd
3194 would generate a random key on the fly. There were two
3195 problems with this: 1) the generated key was 31 bits in size,
3196 and 2) it used the (now weak) ntp_random() function, which was
3197 seeded with a 32-bit value and could only provide 32 bits of
3198 entropy. This was sufficient back in the late 1990s when the
3199 code was written. Not today.
3201 Mitigation - any of:
3202 - Upgrade to 4.2.7p11 or later.
3203 - Follow BCP and put 'restrict ... noquery' in your ntp.conf file.
3205 Credit: This vulnerability was noticed in ntp-4.2.6 by Neel Mehta
3206 of the Google Security Team.
3208 * Non-cryptographic random number generator with weak seed used by
3209 ntp-keygen to generate symmetric keys.
3211 References: [Sec 2666] / CVE-2014-9294 / VU#852879
3212 CVSS: (AV:N/AC:L/Au:M/C:P/I:P/A:C) Base Score: 7.3
3213 Vulnerable Versions: All NTP4 releases before 4.2.7p230
3214 Date Resolved: Dev (4.2.7p230) 01 Nov 2011
3216 Summary: Prior to ntp-4.2.7p230 ntp-keygen used a weak seed to
3217 prepare a random number generator that was of good quality back
3218 in the late 1990s. The random numbers produced was then used to
3219 generate symmetric keys. In ntp-4.2.8 we use a current-technology
3220 cryptographic random number generator, either RAND_bytes from
3221 OpenSSL, or arc4random().
3223 Mitigation - any of:
3224 - Upgrade to 4.2.7p230 or later.
3225 - Follow BCP and put 'restrict ... noquery' in your ntp.conf file.
3227 Credit: This vulnerability was discovered in ntp-4.2.6 by
3228 Stephen Roettger of the Google Security Team.
3230 * Buffer overflow in crypto_recv()
3232 References: Sec 2667 / CVE-2014-9295 / VU#852879
3233 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
3234 Versions: All releases before 4.2.8
3235 Date Resolved: Stable (4.2.8) 18 Dec 2014
3237 Summary: When Autokey Authentication is enabled (i.e. the ntp.conf
3238 file contains a 'crypto pw ...' directive) a remote attacker
3239 can send a carefully crafted packet that can overflow a stack
3240 buffer and potentially allow malicious code to be executed
3241 with the privilege level of the ntpd process.
3243 Mitigation - any of:
3244 - Upgrade to 4.2.8, or later, or
3245 - Disable Autokey Authentication by removing, or commenting out,
3246 all configuration directives beginning with the crypto keyword
3247 in your ntp.conf file.
3249 Credit: This vulnerability was discovered by Stephen Roettger of the
3250 Google Security Team.
3252 * Buffer overflow in ctl_putdata()
3254 References: Sec 2668 / CVE-2014-9295 / VU#852879
3255 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
3256 Versions: All NTP4 releases before 4.2.8
3257 Date Resolved: Stable (4.2.8) 18 Dec 2014
3259 Summary: A remote attacker can send a carefully crafted packet that
3260 can overflow a stack buffer and potentially allow malicious
3261 code to be executed with the privilege level of the ntpd process.
3263 Mitigation - any of:
3264 - Upgrade to 4.2.8, or later.
3265 - Follow BCP and put 'restrict ... noquery' in your ntp.conf file.
3267 Credit: This vulnerability was discovered by Stephen Roettger of the
3268 Google Security Team.
3270 * Buffer overflow in configure()
3272 References: Sec 2669 / CVE-2014-9295 / VU#852879
3273 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
3274 Versions: All NTP4 releases before 4.2.8
3275 Date Resolved: Stable (4.2.8) 18 Dec 2014
3277 Summary: A remote attacker can send a carefully crafted packet that
3278 can overflow a stack buffer and potentially allow malicious
3279 code to be executed with the privilege level of the ntpd process.
3281 Mitigation - any of:
3282 - Upgrade to 4.2.8, or later.
3283 - Follow BCP and put 'restrict ... noquery' in your ntp.conf file.
3285 Credit: This vulnerability was discovered by Stephen Roettger of the
3286 Google Security Team.
3288 * receive(): missing return on error
3290 References: Sec 2670 / CVE-2014-9296 / VU#852879
3291 CVSS: (AV:N/AC:L/Au:N/C:N/I:N/A:P) Base Score: 5.0
3292 Versions: All NTP4 releases before 4.2.8
3293 Date Resolved: Stable (4.2.8) 18 Dec 2014
3295 Summary: Code in ntp_proto.c:receive() was missing a 'return;' in
3296 the code path where an error was detected, which meant
3297 processing did not stop when a specific rare error occurred.
3298 We haven't found a way for this bug to affect system integrity.
3299 If there is no way to affect system integrity the base CVSS
3300 score for this bug is 0. If there is one avenue through which
3301 system integrity can be partially affected, the base score
3302 becomes a 5. If system integrity can be partially affected
3303 via all three integrity metrics, the CVSS base score become 7.5.
3305 Mitigation - any of:
3306 - Upgrade to 4.2.8, or later,
3307 - Remove or comment out all configuration directives
3308 beginning with the crypto keyword in your ntp.conf file.
3310 Credit: This vulnerability was discovered by Stephen Roettger of the
3311 Google Security Team.
3313 See http://support.ntp.org/security for more information.
3315 New features / changes in this release:
3319 * Internal NTP Era counters
3321 The internal counters that track the "era" (range of years) we are in
3322 rolls over every 136 years'. The current "era" started at the stroke of
3323 midnight on 1 Jan 1900, and ends just before the stroke of midnight on
3325 In the past, we have used the "midpoint" of the range to decide which
3326 era we were in. Given the longevity of some products, it became clear
3327 that it would be more functional to "look back" less, and "look forward"
3328 more. We now compile a timestamp into the ntpd executable and when we
3329 get a timestamp we us the "built-on" to tell us what era we are in.
3330 This check "looks back" 10 years, and "looks forward" 126 years.
3332 * ntpdc responses disabled by default
3336 For a long time, ntpq and its mostly text-based mode 6 (control)
3337 protocol have been preferred over ntpdc and its mode 7 (private
3338 request) protocol for runtime queries and configuration. There has
3339 been a goal of deprecating ntpdc, previously held back by numerous
3340 capabilities exposed by ntpdc with no ntpq equivalent. I have been
3341 adding commands to ntpq to cover these cases, and I believe I've
3342 covered them all, though I've not compared command-by-command
3345 As I've said previously, the binary mode 7 protocol involves a lot of
3346 hand-rolled structure layout and byte-swapping code in both ntpd and
3347 ntpdc which is hard to get right. As ntpd grows and changes, the
3348 changes are difficult to expose via ntpdc while maintaining forward
3349 and backward compatibility between ntpdc and ntpd. In contrast,
3350 ntpq's text-based, label=value approach involves more code reuse and
3351 allows compatible changes without extra work in most cases.
3353 Mode 7 has always been defined as vendor/implementation-specific while
3354 mode 6 is described in RFC 1305 and intended to be open to interoperate
3355 with other implementations. There is an early draft of an updated
3356 mode 6 description that likely will join the other NTPv4 RFCs
3357 eventually. (http://tools.ietf.org/html/draft-odonoghue-ntpv4-control-01)
3359 For these reasons, ntpd 4.2.7p230 by default disables processing of
3360 ntpdc queries, reducing ntpd's attack surface and functionally
3361 deprecating ntpdc. If you are in the habit of using ntpdc for certain
3362 operations, please try the ntpq equivalent. If there's no equivalent,
3363 please open a bug report at http://bugs.ntp.org./
3365 In addition to the above, over 1100 issues have been resolved between
3366 the 4.2.6 branch and 4.2.8. The ChangeLog file in the distribution
3370 NTP 4.2.6p5 (Harlan Stenn <stenn@ntp.org>, 2011/12/24)
3376 This is a recommended upgrade.
3378 This release updates sys_rootdisp and sys_jitter calculations to match the
3379 RFC specification, fixes a potential IPv6 address matching error for the
3380 "nic" and "interface" configuration directives, suppresses the creation of
3381 extraneous ephemeral associations for certain broadcastclient and
3382 multicastclient configurations, cleans up some ntpq display issues, and
3383 includes improvements to orphan mode, minor bugs fixes and code clean-ups.
3385 New features / changes in this release:
3389 * Updated "nic" and "interface" IPv6 address handling to prevent
3390 mismatches with localhost [::1] and wildcard [::] which resulted from
3391 using the address/prefix format (e.g. fe80::/64)
3392 * Fix orphan mode stratum incorrectly counting to infinity
3393 * Orphan parent selection metric updated to includes missing ntohl()
3394 * Non-printable stratum 16 refid no longer sent to ntp
3395 * Duplicate ephemeral associations suppressed for broadcastclient and
3396 multicastclient without broadcastdelay
3397 * Exclude undetermined sys_refid from use in loopback TEST12
3398 * Exclude MODE_SERVER responses from KoD rate limiting
3399 * Include root delay in clock_update() sys_rootdisp calculations
3400 * get_systime() updated to exclude sys_residual offset (which only
3401 affected bits "below" sys_tick, the precision threshold)
3402 * sys.peer jitter weighting corrected in sys_jitter calculation
3406 * -n option extended to include the billboard "server" column
3407 * IPv6 addresses in the local column truncated to prevent overruns
3410 NTP 4.2.6p4 (Harlan Stenn <stenn@ntp.org>, 2011/09/22)
3412 Focus: Bug fixes and portability improvements
3416 This is a recommended upgrade.
3418 This release includes build infrastructure updates, code
3419 clean-ups, minor bug fixes, fixes for a number of minor
3420 ref-clock issues, and documentation revisions.
3422 Portability improvements affect AIX, HP-UX, Linux, OS X and 64-bit time_t.
3424 New features / changes in this release:
3428 * Fix checking for struct rtattr
3429 * Update config.guess and config.sub for AIX
3430 * Upgrade required version of autogen and libopts for building
3431 from our source code repository
3435 * Back-ported several fixes for Coverity warnings from ntp-dev
3436 * Fix a rare boundary condition in UNLINK_EXPR_SLIST()
3437 * Allow "logconfig =allall" configuration directive
3438 * Bind tentative IPv6 addresses on Linux
3439 * Correct WWVB/Spectracom driver to timestamp CR instead of LF
3440 * Improved tally bit handling to prevent incorrect ntpq peer status reports
3441 * Exclude the Undisciplined Local Clock and ACTS drivers from the initial
3442 candidate list unless they are designated a "prefer peer"
3443 * Prevent the consideration of Undisciplined Local Clock or ACTS drivers for
3444 selection during the 'tos orphanwait' period
3445 * Prefer an Orphan Mode Parent over the Undisciplined Local Clock or ACTS
3447 * Improved support of the Parse Refclock trusttime flag in Meinberg mode
3448 * Back-port utility routines from ntp-dev: mprintf(), emalloc_zero()
3449 * Added the NTPD_TICKADJ_PPM environment variable for specifying baseline
3450 clock slew on Microsoft Windows
3451 * Code cleanup in libntpq
3455 * Fix timerstats reporting
3459 * Reduce time required to set clock
3460 * Allow a timeout greater than 2 seconds
3464 * Backward incompatible command-line option change:
3465 -l/--filelog changed -l/--logfile (to be consistent with ntpd)
3469 * Update html2man. Fix some tags in the .html files
3470 * Distribute ntp-wait.html
3473 NTP 4.2.6p3 (Harlan Stenn <stenn@ntp.org>, 2011/01/03)
3475 Focus: Bug fixes and portability improvements
3479 This is a recommended upgrade.
3481 This release includes build infrastructure updates, code
3482 clean-ups, minor bug fixes, fixes for a number of minor
3483 ref-clock issues, and documentation revisions.
3485 Portability improvements in this release affect AIX, Atari FreeMiNT,
3486 FreeBSD4, Linux and Microsoft Windows.
3488 New features / changes in this release:
3491 * Use lsb_release to get information about Linux distributions.
3492 * 'test' is in /usr/bin (instead of /bin) on some systems.
3493 * Basic sanity checks for the ChangeLog file.
3494 * Source certain build files with ./filename for systems without . in PATH.
3495 * IRIX portability fix.
3496 * Use a single copy of the "libopts" code.
3497 * autogen/libopts upgrade.
3498 * configure.ac m4 quoting cleanup.
3501 * Do not bind to IN6_IFF_ANYCAST addresses.
3502 * Log the reason for exiting under Windows.
3503 * Multicast fixes for Windows.
3504 * Interpolation fixes for Windows.
3505 * IPv4 and IPv6 Multicast fixes.
3506 * Manycast solicitation fixes and general repairs.
3507 * JJY refclock cleanup.
3508 * NMEA refclock improvements.
3509 * Oncore debug message cleanup.
3510 * Palisade refclock now builds under Linux.
3511 * Give RAWDCF more baud rates.
3512 * Support Truetime Satellite clocks under Windows.
3513 * Support Arbiter 1093C Satellite clocks under Windows.
3514 * Make sure that the "filegen" configuration command defaults to "enable".
3515 * Range-check the status codes (plus other cleanup) in the RIPE-NCC driver.
3516 * Prohibit 'includefile' directive in remote configuration command.
3517 * Fix 'nic' interface bindings.
3518 * Fix the way we link with openssl if openssl is installed in the base
3523 * OpenSSL version display cleanup.
3526 * Many counters should be treated as unsigned.
3529 * Do not ignore replies with equal receive and transmit timestamps.
3532 * libntpq warning cleanup.
3535 * Correct SNMP type for "precision" and "resolution".
3536 * Update the MIB from the draft version to RFC-5907.
3539 * Display timezone offset when showing time for sntp in the local
3541 * Pay proper attention to RATE KoD packets.
3542 * Fix a miscalculation of the offset.
3543 * Properly parse empty lines in the key file.
3545 * Use tv_usec correctly in set_time().
3546 * Documentation cleanup.
3549 NTP 4.2.6p2 (Harlan Stenn <stenn@ntp.org>, 2010/07/08)
3551 Focus: Bug fixes and portability improvements
3555 This is a recommended upgrade.
3557 This release includes build infrastructure updates, code
3558 clean-ups, minor bug fixes, fixes for a number of minor
3559 ref-clock issues, improved KOD handling, OpenSSL related
3560 updates and documentation revisions.
3562 Portability improvements in this release affect Irix, Linux,
3563 Mac OS, Microsoft Windows, OpenBSD and QNX6
3565 New features / changes in this release:
3568 * Range syntax for the trustedkey configuration directive
3569 * Unified IPv4 and IPv6 restrict lists
3572 * Rate limiting and KOD handling
3575 * default connection to net-snmpd via a unix-domain socket
3576 * command-line 'socket name' option
3579 * support for the "passwd ..." syntax
3580 * key-type specific password prompts
3583 * MD5 authentication of an ntpd
3584 * Broadcast and crypto
3588 NTP 4.2.6p1 (Harlan Stenn <stenn@ntp.org>, 2010/04/09)
3590 Focus: Bug fixes, portability fixes, and documentation improvements
3594 This is a recommended upgrade.
3597 NTP 4.2.6 (Harlan Stenn <stenn@ntp.org>, 2009/12/08)
3599 Focus: enhancements and bug fixes.
3602 NTP 4.2.4p8 (Harlan Stenn <stenn@ntp.org>, 2009/12/08)
3604 Focus: Security Fixes
3608 This release fixes the following high-severity vulnerability:
3610 * [Sec 1331] DoS with mode 7 packets - CVE-2009-3563.
3612 See http://support.ntp.org/security for more information.
3614 NTP mode 7 (MODE_PRIVATE) is used by the ntpdc query and control utility.
3615 In contrast, ntpq uses NTP mode 6 (MODE_CONTROL), while routine NTP time
3616 transfers use modes 1 through 5. Upon receipt of an incorrect mode 7
3617 request or a mode 7 error response from an address which is not listed
3618 in a "restrict ... noquery" or "restrict ... ignore" statement, ntpd will
3619 reply with a mode 7 error response (and log a message). In this case:
3621 * If an attacker spoofs the source address of ntpd host A in a
3622 mode 7 response packet sent to ntpd host B, both A and B will
3623 continuously send each other error responses, for as long as
3624 those packets get through.
3626 * If an attacker spoofs an address of ntpd host A in a mode 7
3627 response packet sent to ntpd host A, A will respond to itself
3628 endlessly, consuming CPU and logging excessively.
3630 Credit for finding this vulnerability goes to Robin Park and Dmitri
3631 Vinokurov of Alcatel-Lucent.
3633 THIS IS A STRONGLY RECOMMENDED UPGRADE.
3636 ntpd now syncs to refclocks right away.
3638 Backward-Incompatible changes:
3640 ntpd no longer accepts '-v name' or '-V name' to define internal variables.
3641 Use '--var name' or '--dvar name' instead. (Bug 817)
3644 NTP 4.2.4p7 (Harlan Stenn <stenn@ntp.org>, 2009/05/04)
3646 Focus: Security and Bug Fixes
3650 This release fixes the following high-severity vulnerability:
3652 * [Sec 1151] Remote exploit if autokey is enabled. CVE-2009-1252
3654 See http://support.ntp.org/security for more information.
3656 If autokey is enabled (if ntp.conf contains a "crypto pw whatever"
3657 line) then a carefully crafted packet sent to the machine will cause
3658 a buffer overflow and possible execution of injected code, running
3659 with the privileges of the ntpd process (often root).
3661 Credit for finding this vulnerability goes to Chris Ries of CMU.
3663 This release fixes the following low-severity vulnerabilities:
3665 * [Sec 1144] limited (two byte) buffer overflow in ntpq. CVE-2009-0159
3666 Credit for finding this vulnerability goes to Geoff Keating of Apple.
3668 * [Sec 1149] use SO_EXCLUSIVEADDRUSE on Windows
3669 Credit for finding this issue goes to Dave Hart.
3671 This release fixes a number of bugs and adds some improvements:
3674 * Fix many compiler warnings
3675 * Many fixes and improvements for Windows
3676 * Adds support for AIX 6.1
3677 * Resolves some issues under MacOS X and Solaris
3679 THIS IS A STRONGLY RECOMMENDED UPGRADE.
3682 NTP 4.2.4p6 (Harlan Stenn <stenn@ntp.org>, 2009/01/07)
3688 This release fixes oCERT.org's CVE-2009-0021, a vulnerability affecting
3689 the OpenSSL library relating to the incorrect checking of the return
3690 value of EVP_VerifyFinal function.
3692 Credit for finding this issue goes to the Google Security Team for
3693 finding the original issue with OpenSSL, and to ocert.org for finding
3694 the problem in NTP and telling us about it.
3696 This is a recommended upgrade.
3698 NTP 4.2.4p5 (Harlan Stenn <stenn@ntp.org>, 2008/08/17)
3700 Focus: Minor Bugfixes
3702 This release fixes a number of Windows-specific ntpd bugs and
3703 platform-independent ntpdate bugs. A logging bugfix has been applied
3704 to the ONCORE driver.
3706 The "dynamic" keyword and is now obsolete and deferred binding to local
3707 interfaces is the new default. The minimum time restriction for the
3708 interface update interval has been dropped.
3710 A number of minor build system and documentation fixes are included.
3712 This is a recommended upgrade for Windows.
3715 NTP 4.2.4p4 (Harlan Stenn <stenn@ntp.org>, 2007/09/10)
3717 Focus: Minor Bugfixes
3719 This release updates certain copyright information, fixes several display
3720 bugs in ntpdc, avoids SIGIO interrupting malloc(), cleans up file descriptor
3721 shutdown in the parse refclock driver, removes some lint from the code,
3722 stops accessing certain buffers immediately after they were freed, fixes
3723 a problem with non-command-line specification of -6, and allows the loopback
3724 interface to share addresses with other interfaces.
3727 NTP 4.2.4p3 (Harlan Stenn <stenn@ntp.org>, 2007/06/29)
3729 Focus: Minor Bugfixes
3731 This release fixes a bug in Windows that made it difficult to
3732 terminate ntpd under windows.
3733 This is a recommended upgrade for Windows.
3736 NTP 4.2.4p2 (Harlan Stenn <stenn@ntp.org>, 2007/06/19)
3738 Focus: Minor Bugfixes
3740 This release fixes a multicast mode authentication problem,
3741 an error in NTP packet handling on Windows that could lead to
3742 ntpd crashing, and several other minor bugs. Handling of
3743 multicast interfaces and logging configuration were improved.
3744 The required versions of autogen and libopts were incremented.
3745 This is a recommended upgrade for Windows and multicast users.
3748 NTP 4.2.4 (Harlan Stenn <stenn@ntp.org>, 2006/12/31)
3750 Focus: enhancements and bug fixes.
3752 Dynamic interface rescanning was added to simplify the use of ntpd in
3753 conjunction with DHCP. GNU AutoGen is used for its command-line options
3754 processing. Separate PPS devices are supported for PARSE refclocks, MD5
3755 signatures are now provided for the release files. Drivers have been
3756 added for some new ref-clocks and have been removed for some older
3757 ref-clocks. This release also includes other improvements, documentation
3760 K&R C is no longer supported as of NTP-4.2.4. We are now aiming for ANSI
3764 NTP 4.2.0 (Harlan Stenn <stenn@ntp.org>, 2003/10/15)
3766 Focus: enhancements and bug fixes.