2 NTP 4.2.8p14 (Harlan Stenn <stenn@ntp.org>, 2020 Mar 03)
4 Focus: Security, Bug fixes, enhancements.
8 This release fixes three vulnerabilities: a bug that causes causes an ntpd
9 instance that is explicitly configured to override the default and allow
10 ntpdc (mode 7) connections to be made to a server to read some uninitialized
11 memory; fixes the case where an unmonitored ntpd using an unauthenticated
12 association to its servers may be susceptible to a forged packet DoS attack;
13 and fixes an attack against a client instance that uses a single
14 unauthenticated time source. It also fixes 46 other bugs and addresses
17 * [Sec 3610] process_control() should bail earlier on short packets. stenn@
18 - Reported by Philippe Antoine
19 * [Sec 3596] Highly predictable timestamp attack. <stenn@ntp.org>
20 - Reported by Miroslav Lichvar
21 * [Sec 3592] DoS attack on client ntpd <perlinger@ntp.org>
22 - Reported by Miroslav Lichvar
23 * [Bug 3637] Emit the version of ntpd in saveconfig. stenn@
24 * [Bug 3636] NMEA: combine time/date from multiple sentences <perlinger@ntp.org>
25 * [Bug 3635] Make leapsecond file hash check optional <perlinger@ntp.org>
26 * [Bug 3634] Typo in discipline.html, reported by Jason Harrison. stenn@
27 * [Bug 3628] raw DCF decoding - improve robustness with Zeller's congruence
28 - implement Zeller's congruence in libparse and libntp <perlinger@ntp.org>
29 * [Bug 3627] SIGSEGV on FreeBSD-12 with stack limit and stack gap <perlinger@ntp.org>
30 - integrated patch by Cy Schubert
31 * [Bug 3620] memory leak in ntpq sysinfo <perlinger@ntp.org>
32 - applied patch by Gerry Garvey
33 * [Bug 3619] Honour drefid setting in cooked mode and sysinfo <perlinger@ntp.org>
34 - applied patch by Gerry Garvey
35 * [Bug 3617] Add support for ACE III and Copernicus II receivers <perlinger@ntp.org>
36 - integrated patch by Richard Steedman
37 * [Bug 3615] accelerate refclock startup <perlinger@ntp.org>
38 * [Bug 3613] Propagate noselect to mobilized pool servers <stenn@ntp.org>
39 - Reported by Martin Burnicki
40 * [Bug 3612] Use-of-uninitialized-value in receive function <perlinger@ntp.org>
41 - Reported by Philippe Antoine
42 * [Bug 3611] NMEA time interpreted incorrectly <perlinger@ntp.org>
43 - officially document new "trust date" mode bit for NMEA driver
44 - restore the (previously undocumented) "trust date" feature lost with [bug 3577]
45 * [Bug 3609] Fixing wrong falseticker in case of non-statistic jitter <perlinger@ntp.org>
46 - mostly based on a patch by Michael Haardt, implementing 'fudge minjitter'
47 * [Bug 3608] libparse fails to compile on S11.4SRU13 and later <perlinger@ntp.org>
48 - removed ffs() and fls() prototypes as per Brian Utterback
49 * [Bug 3604] Wrong param byte order passing into record_raw_stats() in
50 ntp_io.c <perlinger@ntp.org>
51 - fixed byte and paramter order as suggested by wei6410@sina.com
52 * [Bug 3601] Tests fail to link on platforms with ntp_cv_gc_sections_runs=no <perlinger@ntp.org>
53 * [Bug 3599] Build fails on linux-m68k due to alignment issues <perlinger@ntp.org>
54 - added padding as suggested by John Paul Adrian Glaubitz
55 * [Bug 3594] ntpd discards messages coming through nmead <perlinger@ntp.org>
56 * [Bug 3593] ntpd discards silently nmea messages after the 5th string <perlinger@ntp.org>
57 * [Bug 3590] Update refclock_oncore.c to the new GPS date API <perlinger@ntp.org>
58 * [Bug 3585] Unity tests mix buffered and unbuffered output <perlinger@ntp.org>
59 - stdout+stderr are set to line buffered during test setup now
60 * [Bug 3583] synchronization error <perlinger@ntp.org>
61 - set clock to base date if system time is before that limit
62 * [Bug 3582] gpsdjson refclock fudgetime1 adjustment is doubled <perlinger@ntp.org>
63 * [Bug 3580] Possible bug ntpq-subs (NULL dereference in dogetassoc) <perlinger@ntp.org>
64 - Reported by Paulo Neves
65 * [Bug 3577] Update refclock_zyfer.c to the new GPS date API <perlinger@ntp.org>
66 - also updates for refclock_nmea.c and refclock_jupiter.c
67 * [Bug 3576] New GPS date function API <perlinger@ntp.org>
68 * [Bug 3573] nptdate: missleading error message <perlinger@ntp.org>
69 * [Bug 3570] NMEA driver docs: talker ID not mentioned, typo <perlinger@ntp.org>
70 * [Bug 3569] cleanup MOD_NANO/STA_NANO handling for 'ntpadjtimex()' <perlinger@ntp.org>
71 - sidekick: service port resolution in 'ntpdate'
72 * [Bug 3550] Reproducible build: Respect SOURCE_DATE_EPOCH <perlinger@ntp.org>
73 - applied patch by Douglas Royds
74 * [Bug 3542] ntpdc monlist parameters cannot be set <perlinger@ntp.org>
75 * [Bug 3533] ntpdc peer_info ipv6 issues <perlinger@ntp.org>
76 - applied patch by Gerry Garvey
77 * [Bug 3531] make check: test-decodenetnum fails <perlinger@ntp.org>
78 - try to harden 'decodenetnum()' against 'getaddrinfo()' errors
79 - fix wrong cond-compile tests in unit tests
80 * [Bug 3517] Reducing build noise <perlinger@ntp.org>
81 * [Bug 3516] Require tooling from this decade <perlinger@ntp.org>
82 - patch by Philipp Prindeville
83 * [Bug 3515] Refactor ntpdmain() dispatcher loop and group common code <perlinger@ntp.org>
84 - patch by Philipp Prindeville
85 * [Bug 3511] Get rid of AC_LANG_SOURCE() warnings <perlinger@ntp.org>
86 - patch by Philipp Prindeville
87 * [Bug 3510] Flatten out the #ifdef nesting in ntpdmain() <perlinger@ntp.org>
88 - partial application of patch by Philipp Prindeville
89 * [Bug 3491] Signed values of LFP datatypes should always display a sign
90 - applied patch by Gerry Garvey & fixed unit tests <perlinger@ntp.org>
91 * [Bug 3490] Patch to support Trimble Resolution Receivers <perlinger@ntp.org>
92 - applied (modified) patch by Richard Steedman
93 * [Bug 3473] RefID of refclocks should always be text format <perlinger@ntp.org>
94 - applied patch by Gerry Garvey (with minor formatting changes)
95 * [Bug 3132] Building 4.2.8p8 with disabled local libopts fails <perlinger@ntp.org>
96 - applied patch by Miroslav Lichvar
97 * [Bug 3094] ntpd trying to listen for broadcasts on a completely ipv6 network
99 * [Bug 2420] ntpd doesn't run and exits with retval 0 when invalid user
100 is specified with -u <perlinger@ntp.org>
101 - monitor daemon child startup & propagate exit codes
102 * [Bug 1433] runtime check whether the kernel really supports capabilities
103 - (modified) patch by Kurt Roeckx <perlinger@ntp.org>
104 * Clean up sntp/networking.c:sendpkt() error message. <stenn@ntp.org>
105 * Provide more detail on unrecognized config file parser tokens. <stenn@ntp.org>
106 * Startup log improvements. <stenn@ntp.org>
107 * Update the copyright year.
110 NTP 4.2.8p13 (Harlan Stenn <stenn@ntp.org>, 2019 Mar 07)
112 Focus: Security, Bug fixes, enhancements.
116 This release fixes a bug that allows an attacker with access to an
117 explicitly trusted source to send a crafted malicious mode 6 (ntpq)
118 packet that can trigger a NULL pointer dereference, crashing ntpd.
119 It also provides 17 other bugfixes and 1 other improvement:
121 * [Sec 3565] Crafted null dereference attack in authenticated
122 mode 6 packet <perlinger@ntp.org>
123 - reported by Magnus Stubman
124 * [Bug 3560] Fix build when HAVE_DROPROOT is not defined <perlinger@ntp.org>
125 - applied patch by Ian Lepore
126 * [Bug 3558] Crash and integer size bug <perlinger@ntp.org>
127 - isolate and fix linux/windows specific code issue
128 * [Bug 3556] ntp_loopfilter.c snprintf compilation warnings <perlinger@ntp.org>
129 - provide better function for incremental string formatting
130 * [Bug 3555] Tidy up print alignment of debug output from ntpdate <perlinger@ntp.org>
131 - applied patch by Gerry Garvey
132 * [Bug 3554] config revoke stores incorrect value <perlinger@ntp.org>
133 - original finding by Gerry Garvey, additional cleanup needed
134 * [Bug 3549] Spurious initgroups() error message <perlinger@ntp.org>
135 - patch by Christous Zoulas
136 * [Bug 3548] Signature not verified on windows system <perlinger@ntp.org>
137 - finding by Chen Jiabin, plus another one by me
138 * [Bug 3541] patch to fix STA_NANO struct timex units <perlinger@ntp.org>
139 - applied patch by Maciej Szmigiero
140 * [Bug 3540] Cannot set minsane to 0 anymore <perlinger@ntp.org>
141 - applied patch by Andre Charbonneau
142 * [Bug 3539] work_fork build fails when droproot is not supported <perlinger@ntp.org>
143 - applied patch by Baruch Siach
144 * [Bug 3538] Build fails for no-MMU targets <perlinger@ntp.org>
145 - applied patch by Baruch Siach
146 * [Bug 3535] libparse won't handle GPS week rollover <perlinger@ntp.org>
147 - refactored handling of GPS era based on 'tos basedate' for
148 parse (TSIP) and JUPITER clocks
149 * [Bug 3529] Build failures on Mac OS X 10.13 (High Sierra) <perlinger@ntp.org>
150 - patch by Daniel J. Luke; this does not fix a potential linker
151 regression issue on MacOS.
152 * [Bug 3527 - Backward Incompatible] mode7 clockinfo fudgeval2 packet
153 anomaly <perlinger@ntp.org>, reported by GGarvey.
154 - --enable-bug3527-fix support by HStenn
155 * [Bug 3526] Incorrect poll interval in packet <perlinger@ntp.org>
156 - applied patch by Gerry Garvey
157 * [Bug 3471] Check for openssl/[ch]mac.h. <perlinger@ntp.org>
158 - added missing check, reported by Reinhard Max <perlinger@ntp.org>
159 * [Bug 1674] runtime crashes and sync problems affecting both x86 and x86_64
160 - this is a variant of [bug 3558] and should be fixed with it
161 * Implement 'configure --disable-signalled-io'
164 NTP 4.2.8p12 (Harlan Stenn <stenn@ntp.org>, 2018/14/09)
166 Focus: Security, Bug fixes, enhancements.
170 This release fixes a "hole" in the noepeer capability introduced to ntpd
171 in ntp-4.2.8p11, and a buffer overflow in the openhost() function used by
172 ntpq and ntpdc. It also provides 26 other bugfixes, and 4 other improvements:
174 * [Sec 3505] Buffer overflow in the openhost() call of ntpq and ntpdc.
176 * [Sec 3012] Fix a hole in the new "noepeer" processing.
179 [Bug 3521] Fix a logic bug in the INVALIDNAK checks. <stenn@ntp.org>
180 [Bug 3509] Add support for running as non-root on FreeBSD, Darwin,
181 other TrustedBSD platforms
182 - applied patch by Ian Lepore <perlinger@ntp.org>
183 [Bug 3506] Service Control Manager interacts poorly with NTPD <perlinger@ntp.org>
184 - changed interaction with SCM to signal pending startup
185 [Bug 3486] Buffer overflow in ntpq/ntpq.c:tstflags() <perlinger@ntp.org>
186 - applied patch by Gerry Garvey
187 [Bug 3485] Undefined sockaddr used in error messages in ntp_config.c <perlinger@ntp.org>
188 - applied patch by Gerry Garvey
189 [Bug 3484] ntpq response from ntpd is incorrect when REFID is null <perlinger@ntp.org>
190 - rework of ntpq 'nextvar()' key/value parsing
191 [Bug 3482] Fixes for compilation warnings (ntp_io.c & ntpq-subs.c) <perlinger@ntp.org>
192 - applied patch by Gerry Garvey (with mods)
193 [Bug 3480] Refclock sample filter not cleared on clock STEP <perlinger@ntp.org>
194 - applied patch by Gerry Garvey
195 [Bug 3479] ctl_putrefid() allows unsafe characters through to ntpq <perlinger@ntp.org>
196 - applied patch by Gerry Garvey (with mods)
197 [Bug 3476]ctl_putstr() sends empty unquoted string [...] <perlinger@ntp.org>
198 - applied patch by Gerry Garvey (with mods); not sure if that's bug or feature, though
199 [Bug 3475] modify prettydate() to suppress output of zero time <perlinger@ntp.org>
200 - applied patch by Gerry Garvey
201 [Bug 3474] Missing pmode in mode7 peer info response <perlinger@ntp.org>
202 - applied patch by Gerry Garvey
203 [Bug 3471] Check for openssl/[ch]mac.h. HStenn.
204 - add #define ENABLE_CMAC support in configure. HStenn.
205 [Bug 3470] ntpd4.2.8p11 fails to compile without OpenSSL <perlinger@ntp.org>
206 [Bug 3469] Incomplete string compare [...] in is_refclk_addr <perlinger@ntp.org>
207 - patch by Stephen Friedl
208 [Bug 3467] Potential memory fault in ntpq [...] <perlinger@ntp.org>
209 - fixed IO redirection and CTRL-C handling in ntq and ntpdc
210 [Bug 3465] Default TTL values cannot be used <perlinger@ntp.org>
211 [Bug 3461] refclock_shm.c: clear error status on clock recovery <perlinger@ntp.org>
212 - initial patch by Hal Murray; also fixed refclock_report() trouble
213 [Bug 3460] Fix typo in ntpq.texi, reported by Kenyon Ralph. <stenn@ntp.org>
214 [Bug 3456] Use uintptr_t rather than size_t to store an integer in a pointer
215 - According to Brooks Davis, there was only one location <perlinger@ntp.org>
216 [Bug 3449] ntpq - display "loop" instead of refid [...] <perlinger@ntp.org>
217 - applied patch by Gerry Garvey
218 [Bug 3445] Symmetric peer won't sync on startup <perlinger@ntp.org>
219 - applied patch by Gerry Garvey
220 [Bug 3442] Fixes for ntpdate as suggested by Gerry Garvey,
222 New macro REFID_ISTEXT() which is also used in ntpd/ntp_control.c.
223 [Bug 3434] ntpd clears STA_UNSYNC on start <perlinger@ntp.org>
224 - applied patch by Miroslav Lichvar
225 [Bug 3426] ntpdate.html -t default is 2 seconds. Leonid Evdokimov.
226 [Bug 3121] Drop root privileges for the forked DNS worker <perlinger@ntp.org>
227 - integrated patch by Reinhard Max
228 [Bug 2821] minor build issues <perlinger@ntp.org>
229 - applied patches by Christos Zoulas, including real bug fixes
230 html/authopt.html: cleanup, from <stenn@ntp.org>
231 ntpd/ntpd.c: DROPROOT cleanup. <stenn@ntp.org>
232 Symmetric key range is 1-65535. Update docs. <stenn@ntp.org>
235 NTP 4.2.8p11 (Harlan Stenn <stenn@ntp.org>, 2018/02/27)
237 Focus: Security, Bug fixes, enhancements.
241 This release fixes 2 low-/medium-, 1 informational/medum-, and 2 low-severity
242 vulnerabilities in ntpd, one medium-severity vulernability in ntpq, and
243 provides 65 other non-security fixes and improvements:
245 * NTP Bug 3454: Unauthenticated packet can reset authenticated interleaved
246 association (LOW/MED)
247 Date Resolved: Stable (4.2.8p11) 27 Feb 2018
248 References: Sec 3454 / CVE-2018-7185 / VU#961909
249 Affects: ntp-4.2.6, up to but not including ntp-4.2.8p11.
250 CVSS2: MED 4.3 (AV:N/AC:M/Au:N/C:N/I:N/A:P) This could score between
252 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
253 score between 2.6 and 3.1
255 The NTP Protocol allows for both non-authenticated and
256 authenticated associations, in client/server, symmetric (peer),
257 and several broadcast modes. In addition to the basic NTP
258 operational modes, symmetric mode and broadcast servers can
259 support an interleaved mode of operation. In ntp-4.2.8p4 a bug
260 was inadvertently introduced into the protocol engine that
261 allows a non-authenticated zero-origin (reset) packet to reset
262 an authenticated interleaved peer association. If an attacker
263 can send a packet with a zero-origin timestamp and the source
264 IP address of the "other side" of an interleaved association,
265 the 'victim' ntpd will reset its association. The attacker must
266 continue sending these packets in order to maintain the
267 disruption of the association. In ntp-4.0.0 thru ntp-4.2.8p6,
268 interleave mode could be entered dynamically. As of ntp-4.2.8p7,
269 interleaved mode must be explicitly configured/enabled.
272 Upgrade to 4.2.8p11, or later, from the NTP Project Download Page
273 or the NTP Public Services Project Download Page.
274 If you are unable to upgrade to 4.2.8p11 or later and have
275 'peer HOST xleave' lines in your ntp.conf file, remove the
277 Have enough sources of time.
278 Properly monitor your ntpd instances.
279 If ntpd stops running, auto-restart it without -g .
281 This weakness was discovered by Miroslav Lichvar of Red Hat.
283 * NTP Bug 3453: Interleaved symmetric mode cannot recover from bad
285 Date Resolved: Stable (4.2.8p11) 27 Feb 2018
286 References: Sec 3453 / CVE-2018-7184 / VU#961909
287 Affects: ntpd in ntp-4.2.8p4, up to but not including ntp-4.2.8p11.
288 CVSS2: MED 4.3 (AV:N/AC:M/Au:N/C:P/I:N/A:N)
289 Could score between 2.9 and 6.8.
290 CVSS3: LOW 3.1 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
291 Could score between 2.6 and 6.0.
293 The fix for NtpBug2952 was incomplete, and while it fixed one
294 problem it created another. Specifically, it drops bad packets
295 before updating the "received" timestamp. This means a
296 third-party can inject a packet with a zero-origin timestamp,
297 meaning the sender wants to reset the association, and the
298 transmit timestamp in this bogus packet will be saved as the
299 most recent "received" timestamp. The real remote peer does
300 not know this value and this will disrupt the association until
301 the association resets.
304 Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
305 or the NTP Public Services Project Download Page.
306 Use authentication with 'peer' mode.
307 Have enough sources of time.
308 Properly monitor your ntpd instances.
309 If ntpd stops running, auto-restart it without -g .
311 This weakness was discovered by Miroslav Lichvar of Red Hat.
313 * NTP Bug 3415: Provide a way to prevent authenticated symmetric passive
315 Date Resolved: Stable (4.2.8p11) 27 Feb 2018
316 References: Sec 3415 / CVE-2018-7170 / VU#961909
317 Sec 3012 / CVE-2016-1549 / VU#718152
318 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
319 4.3.0 up to, but not including 4.3.92. Resolved in 4.2.8p11.
320 CVSS2: LOW 3.5 - (AV:N/AC:M/Au:S/C:N/I:P/A:N)
321 CVSS3: LOW 3.1 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
323 ntpd can be vulnerable to Sybil attacks. If a system is set up to
324 use a trustedkey and if one is not using the feature introduced in
325 ntp-4.2.8p6 allowing an optional 4th field in the ntp.keys file to
326 specify which IPs can serve time, a malicious authenticated peer
327 -- i.e. one where the attacker knows the private symmetric key --
328 can create arbitrarily-many ephemeral associations in order to win
329 the clock selection of ntpd and modify a victim's clock. Three
330 additional protections are offered in ntp-4.2.8p11. One is the
331 new 'noepeer' directive, which disables symmetric passive
332 ephemeral peering. Another is the new 'ippeerlimit' directive,
333 which limits the number of peers that can be created from an IP.
334 The third extends the functionality of the 4th field in the
335 ntp.keys file to include specifying a subnet range.
338 Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
339 or the NTP Public Services Project Download Page.
340 Use the 'noepeer' directive to prohibit symmetric passive
341 ephemeral associations.
342 Use the 'ippeerlimit' directive to limit the number of peers
343 that can be created from an IP.
344 Use the 4th argument in the ntp.keys file to limit the IPs and
345 subnets that can be time servers.
346 Have enough sources of time.
347 Properly monitor your ntpd instances.
348 If ntpd stops running, auto-restart it without -g .
350 This weakness was reported as Bug 3012 by Matthew Van Gundy of
351 Cisco ASIG, and separately by Stefan Moser as Bug 3415.
353 * ntpq Bug 3414: decodearr() can write beyond its 'buf' limits (Medium)
354 Date Resolved: 27 Feb 2018
355 References: Sec 3414 / CVE-2018-7183 / VU#961909
356 Affects: ntpq in ntp-4.2.8p6, up to but not including ntp-4.2.8p11.
357 CVSS2: MED 6.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)
358 CVSS3: MED 5.0 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
360 ntpq is a monitoring and control program for ntpd. decodearr()
361 is an internal function of ntpq that is used to -- wait for it --
362 decode an array in a response string when formatted data is being
363 displayed. This is a problem in affected versions of ntpq if a
364 maliciously-altered ntpd returns an array result that will trip this
365 bug, or if a bad actor is able to read an ntpq request on its way to
366 a remote ntpd server and forge and send a response before the remote
367 ntpd sends its response. It's potentially possible that the
368 malicious data could become injectable/executable code.
371 Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
372 or the NTP Public Services Project Download Page.
374 This weakness was discovered by Michael Macnair of Thales e-Security.
376 * NTP Bug 3412: ctl_getitem(): buffer read overrun leads to undefined
377 behavior and information leak (Info/Medium)
378 Date Resolved: 27 Feb 2018
379 References: Sec 3412 / CVE-2018-7182 / VU#961909
380 Affects: ntp-4.2.8p6, up to but not including ntp-4.2.8p11.
381 CVSS2: INFO 0.0 - MED 5.0 (AV:N/AC:L/Au:N/C:P/I:N/A:N) 0.0 if C:N
382 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
385 ctl_getitem() is used by ntpd to process incoming mode 6 packets.
386 A malicious mode 6 packet can be sent to an ntpd instance, and
387 if the ntpd instance is from 4.2.8p6 thru 4.2.8p10, that will
388 cause ctl_getitem() to read past the end of its buffer.
391 Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
392 or the NTP Public Services Project Download Page.
393 Have enough sources of time.
394 Properly monitor your ntpd instances.
395 If ntpd stops running, auto-restart it without -g .
397 This weakness was discovered by Yihan Lian of Qihoo 360.
399 * NTP Bug 3012: Sybil vulnerability: ephemeral association attack
400 Also see Bug 3415, above.
401 Date Mitigated: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
402 Date Resolved: Stable (4.2.8p11) 27 Feb 2018
403 References: Sec 3012 / CVE-2016-1549 / VU#718152
404 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
405 4.3.0 up to, but not including 4.3.92. Resolved in 4.2.8p11.
406 CVSS2: LOW 3.5 - (AV:N/AC:M/Au:S/C:N/I:P/A:N)
407 CVSS3: MED 5.3 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
409 ntpd can be vulnerable to Sybil attacks. If a system is set up
410 to use a trustedkey and if one is not using the feature
411 introduced in ntp-4.2.8p6 allowing an optional 4th field in the
412 ntp.keys file to specify which IPs can serve time, a malicious
413 authenticated peer -- i.e. one where the attacker knows the
414 private symmetric key -- can create arbitrarily-many ephemeral
415 associations in order to win the clock selection of ntpd and
416 modify a victim's clock. Two additional protections are
417 offered in ntp-4.2.8p11. One is the 'noepeer' directive, which
418 disables symmetric passive ephemeral peering. The other extends
419 the functionality of the 4th field in the ntp.keys file to
420 include specifying a subnet range.
423 Upgrade to 4.2.8p11, or later, from the NTP Project Download Page or
424 the NTP Public Services Project Download Page.
425 Use the 'noepeer' directive to prohibit symmetric passive
426 ephemeral associations.
427 Use the 'ippeerlimit' directive to limit the number of peer
428 associations from an IP.
429 Use the 4th argument in the ntp.keys file to limit the IPs
430 and subnets that can be time servers.
431 Properly monitor your ntpd instances.
433 This weakness was discovered by Matthew Van Gundy of Cisco ASIG.
436 [Bug 3457] OpenSSL FIPS mode regression <perlinger@ntp.org>
437 [Bug 3455] ntpd doesn't use scope id when binding multicast <perlinger@ntp.org>
438 - applied patch by Sean Haugh
439 [Bug 3452] PARSE driver prints uninitialized memory. <perlinger@ntp.org>
440 [Bug 3450] Dubious error messages from plausibility checks in get_systime()
441 - removed error log caused by rounding/slew, ensured postcondition <perlinger@ntp.org>
442 [Bug 3447] AES-128-CMAC (fixes) <perlinger@ntp.org>
443 - refactoring the MAC code, too
444 [Bug 3441] Validate the assumption that AF_UNSPEC is 0. stenn@ntp.org
445 [Bug 3439] When running multiple commands / hosts in ntpq... <perlinger@ntp.org>
446 - applied patch by ggarvey
447 [Bug 3438] Negative values and values > 999 days in... <perlinger@ntp.org>
448 - applied patch by ggarvey (with minor mods)
449 [Bug 3437] ntpd tries to open socket with AF_UNSPEC domain
450 - applied patch (with mods) by Miroslav Lichvar <perlinger@ntp.org>
451 [Bug 3435] anchor NTP era alignment <perlinger@ntp.org>
452 [Bug 3433] sntp crashes when run with -a. <stenn@ntp.org>
453 [Bug 3430] ntpq dumps core (SIGSEGV) for "keytype md2"
454 - fixed several issues with hash algos in ntpd, sntp, ntpq,
455 ntpdc and the test suites <perlinger@ntp.org>
456 [Bug 3424] Trimble Thunderbolt 1024 week millenium bug <perlinger@ntp.org>
457 - initial patch by Daniel Pouzzner
458 [Bug 3423] QNX adjtime() implementation error checking is
459 wrong <perlinger@ntp.org>
460 [Bug 3417] ntpq ifstats packet counters can be negative
461 made IFSTATS counter quantities unsigned <perlinger@ntp.org>
462 [Bug 3411] problem about SIGN(6) packet handling for ntp-4.2.8p10
463 - raised receive buffer size to 1200 <perlinger@ntp.org>
464 [Bug 3408] refclock_jjy.c: Avoid a wrong report of the coverity static
465 analysis tool. <abe@ntp.org>
466 [Bug 3405] update-leap.in: general cleanup, HTTPS support. Paul McMath.
467 [Bug 3404] Fix openSSL DLL usage under Windows <perlinger@ntp.org>
468 - fix/drop assumptions on OpenSSL libs directory layout
469 [Bug 3399] NTP: linker error in 4.2.8p10 during Linux cross-compilation
470 - initial patch by timeflies@mail2tor.com <perlinger@ntp.org>
471 [Bug 3398] tests fail with core dump <perlinger@ntp.org>
472 - patch contributed by Alexander Bluhm
473 [Bug 3397] ctl_putstr() asserts that data fits in its buffer
474 rework of formatting & data transfer stuff in 'ntp_control.c'
475 avoids unecessary buffers and size limitations. <perlinger@ntp.org>
476 [Bug 3394] Leap second deletion does not work on ntpd clients
477 - fixed handling of dynamic deletion w/o leap file <perlinger@ntp.org>
478 [Bug 3391] ntpd segfaults on startup due to small warmup thread stack size
479 - increased mimimum stack size to 32kB <perlinger@ntp.org>
480 [Bug 3367] Faulty LinuxPPS NMEA clock support in 4.2.8 <perlinger@ntp.org>
481 - reverted handling of PPS kernel consumer to 4.2.6 behavior
482 [Bug 3365] Updates driver40(-ja).html and miscopt.html <abe@ntp.org>
483 [Bug 3358] Spurious KoD log messages in .INIT. phase. HStenn.
484 [Bug 3016] wrong error position reported for bad ":config pool"
485 - fixed location counter & ntpq output <perlinger@ntp.org>
486 [Bug 2900] libntp build order problem. HStenn.
487 [Bug 2878] Tests are cluttering up syslog <perlinger@ntp.org>
488 [Bug 2737] Wrong phone number listed for USNO. ntp-bugs@bodosom.net,
490 [Bug 2557] Fix Thunderbolt init. ntp-bugs@bodosom.net, perlinger@ntp.
491 [Bug 948] Trustedkey config directive leaks memory. <perlinger@ntp.org>
492 Use strlcpy() to copy strings, not memcpy(). HStenn.
494 test_ntp_scanner_LDADD needs ntpd/ntp_io.o. HStenn.
495 refclock_jjy.c: Add missing "%s" to an msyslog() call. HStenn.
496 Build ntpq and libntpq.a with NTP_HARD_*FLAGS. perlinger@ntp.org
497 Fix trivial warnings from 'make check'. perlinger@ntp.org
498 Fix bug in the override portion of the compiler hardening macro. HStenn.
499 record_raw_stats(): Log entire packet. Log writes. HStenn.
500 AES-128-CMAC support. BInglis, HStenn, JPerlinger.
501 sntp: tweak key file logging. HStenn.
502 sntp: pkt_output(): Improve debug output. HStenn.
503 update-leap: updates from Paul McMath.
504 When using pkg-config, report --modversion. HStenn.
505 Clean up libevent configure checks. HStenn.
506 sntp: show the IP of who sent us a crypto-NAK. HStenn.
507 Allow .../N to specify subnet bits for IPs in ntp.keys. HStenn, JPerlinger.
508 authistrustedip() - use it in more places. HStenn, JPerlinger.
509 New sysstats: sys_lamport, sys_tsrounding. HStenn.
510 Update ntp.keys .../N documentation. HStenn.
511 Distribute testconf.yml. HStenn.
512 Add DPRINTF(2,...) lines to receive() for packet drops. HStenn.
513 Rename the configuration flag fifo variables. HStenn.
514 Improve saveconfig output. HStenn.
515 Decode restrict flags on receive() debug output. HStenn.
516 Decode interface flags on receive() debug output. HStenn.
517 Warn the user if deprecated "driftfile name WanderThreshold" is used. HStenn.
518 Update the documentation in ntp.conf.def . HStenn.
519 restrictions() must return restrict flags and ippeerlimit. HStenn.
520 Update ntpq peer documentation to describe the 'p' type. HStenn.
521 Rename restrict 'flags' to 'rflags. Use an enum for the values. HStenn.
522 Provide dump_restricts() for debugging. HStenn.
523 Use consistent 4th arg type for [gs]etsockopt. JPerlinger.
527 * update-leap needs the following perl modules:
531 * New sysstats variables: sys_lamport, sys_tsrounding
532 See them with: ntpq -c "rv 0 ss_lamport,ss_tsrounding"
533 sys_lamport counts the number of observed Lamport violations, while
534 sys_tsrounding counts observed timestamp rounding events.
536 * New ntp.conf items:
538 - restrict ... noepeer
539 - restrict ... ippeerlimit N
541 The 'noepeer' directive will disallow all ephemeral/passive peer
544 The 'ippeerlimit' directive limits the number of time associations
545 for each IP in the designated set of addresses. This limit does not
546 apply to explicitly-configured associations. A value of -1, the current
547 default, means an unlimited number of associations may connect from a
548 single IP. 0 means "none", etc. Ordinarily the only way multiple
549 associations would come from the same IP would be if the remote side
550 was using a proxy. But a trusted machine might become compromised,
551 in which case an attacker might spin up multiple authenticated sessions
552 from different ports. This directive should be helpful in this case.
554 * New ntp.keys feature: Each IP in the optional list of IPs in the 4th
555 field may contain a /subnetbits specification, which identifies the
556 scope of IPs that may use this key. This IP/subnet restriction can be
557 used to limit the IPs that may use the key in most all situations where
560 NTP 4.2.8p10 (Harlan Stenn <stenn@ntp.org>, 2017/03/21)
562 Focus: Security, Bug fixes, enhancements.
566 This release fixes 5 medium-, 6 low-, and 4 informational-severity
567 vulnerabilities, and provides 15 other non-security fixes and improvements:
569 * NTP-01-016 NTP: Denial of Service via Malformed Config (Medium)
570 Date Resolved: 21 Mar 2017
571 References: Sec 3389 / CVE-2017-6464 / VU#325339
572 Affects: All versions of NTP-4, up to but not including ntp-4.2.8p10, and
573 ntp-4.3.0 up to, but not including ntp-4.3.94.
574 CVSS2: MED 4.6 (AV:N/AC:H/Au:M/C:N/I:N/A:C)
575 CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
577 A vulnerability found in the NTP server makes it possible for an
578 authenticated remote user to crash ntpd via a malformed mode
579 configuration directive.
582 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page or
583 the NTP Public Services Project Download Page
584 Properly monitor your ntpd instances, and auto-restart
585 ntpd (without -g) if it stops running.
587 This weakness was discovered by Cure53.
589 * NTP-01-014 NTP: Buffer Overflow in DPTS Clock (Low)
590 Date Resolved: 21 Mar 2017
591 References: Sec 3388 / CVE-2017-6462 / VU#325339
592 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.
593 CVSS2: Low 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
594 CVSS3: Low 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
596 There is a potential for a buffer overflow in the legacy Datum
597 Programmable Time Server refclock driver. Here the packets are
598 processed from the /dev/datum device and handled in
599 datum_pts_receive(). Since an attacker would be required to
600 somehow control a malicious /dev/datum device, this does not
601 appear to be a practical attack and renders this issue "Low" in
604 If you have a Datum reference clock installed and think somebody
605 may maliciously change the device, upgrade to 4.2.8p10, or
606 later, from the NTP Project Download Page or the NTP Public
607 Services Project Download Page
608 Properly monitor your ntpd instances, and auto-restart
609 ntpd (without -g) if it stops running.
611 This weakness was discovered by Cure53.
613 * NTP-01-012 NTP: Authenticated DoS via Malicious Config Option (Medium)
614 Date Resolved: 21 Mar 2017
615 References: Sec 3387 / CVE-2017-6463 / VU#325339
616 Affects: All versions of ntp, up to but not including ntp-4.2.8p10, and
617 ntp-4.3.0 up to, but not including ntp-4.3.94.
618 CVSS2: MED 4.6 (AV:N/AC:H/Au:M/C:N/I:N/A:C)
619 CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
621 A vulnerability found in the NTP server allows an authenticated
622 remote attacker to crash the daemon by sending an invalid setting
623 via the :config directive. The unpeer option expects a number or
624 an address as an argument. In case the value is "0", a
625 segmentation fault occurs.
628 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
629 or the NTP Public Services Project Download Page
630 Properly monitor your ntpd instances, and auto-restart
631 ntpd (without -g) if it stops running.
633 This weakness was discovered by Cure53.
635 * NTP-01-011 NTP: ntpq_stripquotes() returns incorrect value (Informational)
636 Date Resolved: 21 Mar 2017
638 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
639 ntp-4.3.0 up to, but not including ntp-4.3.94.
640 CVSS2: None 0.0 (AV:N/AC:H/Au:N/C:N/I:N/A:N)
641 CVSS3: None 0.0 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:N
643 The NTP Mode 6 monitoring and control client, ntpq, uses the
644 function ntpq_stripquotes() to remove quotes and escape characters
645 from a given string. According to the documentation, the function
646 is supposed to return the number of copied bytes but due to
647 incorrect pointer usage this value is always zero. Although the
648 return value of this function is never used in the code, this
649 flaw could lead to a vulnerability in the future. Since relying
650 on wrong return values when performing memory operations is a
651 dangerous practice, it is recommended to return the correct value
652 in accordance with the documentation pertinent to the code.
655 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
656 or the NTP Public Services Project Download Page
657 Properly monitor your ntpd instances, and auto-restart
658 ntpd (without -g) if it stops running.
660 This weakness was discovered by Cure53.
662 * NTP-01-010 NTP: ereallocarray()/eallocarray() underused (Info)
663 Date Resolved: 21 Mar 2017
665 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
666 ntp-4.3.0 up to, but not including ntp-4.3.94.
668 NTP makes use of several wrappers around the standard heap memory
669 allocation functions that are provided by libc. This is mainly
670 done to introduce additional safety checks concentrated on
671 several goals. First, they seek to ensure that memory is not
672 accidentally freed, secondly they verify that a correct amount
673 is always allocated and, thirdly, that allocation failures are
674 correctly handled. There is an additional implementation for
675 scenarios where memory for a specific amount of items of the
676 same size needs to be allocated. The handling can be found in
677 the oreallocarray() function for which a further number-of-elements
678 parameter needs to be provided. Although no considerable threat
679 was identified as tied to a lack of use of this function, it is
680 recommended to correctly apply oreallocarray() as a preferred
681 option across all of the locations where it is possible.
683 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
684 or the NTP Public Services Project Download Page
686 This weakness was discovered by Cure53.
688 * NTP-01-009 NTP: Privileged execution of User Library code (WINDOWS
690 Date Resolved: 21 Mar 2017
691 References: Sec 3384 / CVE-2017-6455 / VU#325339
692 Affects: All Windows versions of ntp-4 that use the PPSAPI, up to but
693 not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not
694 including ntp-4.3.94.
695 CVSS2: MED 3.8 (AV:L/AC:H/Au:S/C:N/I:N/A:C)
696 CVSS3: MED 4.0 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
698 The Windows NT port has the added capability to preload DLLs
699 defined in the inherited global local environment variable
700 PPSAPI_DLLS. The code contained within those libraries is then
701 called from the NTPD service, usually running with elevated
702 privileges. Depending on how securely the machine is setup and
703 configured, if ntpd is configured to use the PPSAPI under Windows
704 this can easily lead to a code injection.
707 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
708 or the NTP Public Services Project Download Page
710 This weakness was discovered by Cure53.
712 * NTP-01-008 NTP: Stack Buffer Overflow from Command Line (WINDOWS
713 installer ONLY) (Low)
714 Date Resolved: 21 Mar 2017
715 References: Sec 3383 / CVE-2017-6452 / VU#325339
716 Affects: WINDOWS installer ONLY: All versions of the ntp-4 Windows
717 installer, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up
718 to, but not including ntp-4.3.94.
719 CVSS2: Low 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
720 CVSS3: Low 1.8 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
722 The Windows installer for NTP calls strcat(), blindly appending
723 the string passed to the stack buffer in the addSourceToRegistry()
724 function. The stack buffer is 70 bytes smaller than the buffer
725 in the calling main() function. Together with the initially
726 copied Registry path, the combination causes a stack buffer
727 overflow and effectively overwrites the stack frame. The
728 passed application path is actually limited to 256 bytes by the
729 operating system, but this is not sufficient to assure that the
730 affected stack buffer is consistently protected against
731 overflowing at all times.
733 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
734 or the NTP Public Services Project Download Page
736 This weakness was discovered by Cure53.
738 * NTP-01-007 NTP: Data Structure terminated insufficiently (WINDOWS
739 installer ONLY) (Low)
740 Date Resolved: 21 Mar 2017
741 References: Sec 3382 / CVE-2017-6459 / VU#325339
742 Affects: WINDOWS installer ONLY: All ntp-4 versions of the Windows
743 installer, up to but not including ntp-4.2.8p10, and ntp-4.3.0
744 up to, but not including ntp-4.3.94.
745 CVSS2: Low 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
746 CVSS3: Low 1.8 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
748 The Windows installer for NTP calls strcpy() with an argument
749 that specifically contains multiple null bytes. strcpy() only
750 copies a single terminating null character into the target
751 buffer instead of copying the required double null bytes in the
752 addKeysToRegistry() function. As a consequence, a garbage
753 registry entry can be created. The additional arsize parameter
754 is erroneously set to contain two null bytes and the following
755 call to RegSetValueEx() claims to be passing in a multi-string
756 value, though this may not be true.
758 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
759 or the NTP Public Services Project Download Page
761 This weakness was discovered by Cure53.
763 * NTP-01-006 NTP: Copious amounts of Unused Code (Informational)
766 The report says: Statically included external projects
767 potentially introduce several problems and the issue of having
768 extensive amounts of code that is "dead" in the resulting binary
769 must clearly be pointed out. The unnecessary unused code may or
770 may not contain bugs and, quite possibly, might be leveraged for
771 code-gadget-based branch-flow redirection exploits. Analogically,
772 having source trees statically included as well means a failure
773 in taking advantage of the free feature for periodical updates.
774 This solution is offered by the system's Package Manager. The
775 three libraries identified are libisc, libevent, and libopts.
777 For libisc, we already only use a portion of the original library.
778 We've found and fixed bugs in the original implementation (and
779 offered the patches to ISC), and plan to see what has changed
780 since we last upgraded the code. libisc is generally not
781 installed, and when it it we usually only see the static libisc.a
782 file installed. Until we know for sure that the bugs we've found
783 and fixed are fixed upstream, we're better off with the copy we
786 Version 1 of libevent was the only production version available
787 until recently, and we've been requiring version 2 for a long time.
788 But if the build system has at least version 2 of libevent
789 installed, we'll use the version that is installed on the system.
790 Otherwise, we provide a copy of libevent that we know works.
792 libopts is provided by GNU AutoGen, and that library and package
793 undergoes frequent API version updates. The version of autogen
794 used to generate the tables for the code must match the API
795 version in libopts. AutoGen can be ... difficult to build and
796 install, and very few developers really need it. So we have it
797 on our build and development machines, and we provide the
798 specific version of the libopts code in the distribution to make
799 sure that the proper API version of libopts is available.
801 As for the point about there being code in these libraries that
802 NTP doesn't use, OK. But other packages used these libraries as
803 well, and it is reasonable to assume that other people are paying
804 attention to security and code quality issues for the overall
805 libraries. It takes significant resources to analyze and
806 customize these libraries to only include what we need, and to
807 date we believe the cost of this effort does not justify the benefit.
809 This issue was discovered by Cure53.
811 * NTP-01-005 NTP: Off-by-one in Oncore GPS Receiver (Low)
812 Date Resolved: 21 Mar 2017
814 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
815 ntp-4.3.0 up to, but not including ntp-4.3.94.
816 CVSS2: None 0.0 (AV:L/AC:H/Au:N/C:N/I:N/A:N)
817 CVSS3: None 0.0 CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N
819 There is a fencepost error in a "recovery branch" of the code for
820 the Oncore GPS receiver if the communication link to the ONCORE
821 is weak / distorted and the decoding doesn't work.
823 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page or
824 the NTP Public Services Project Download Page
825 Properly monitor your ntpd instances, and auto-restart
826 ntpd (without -g) if it stops running.
828 This weakness was discovered by Cure53.
830 * NTP-01-004 NTP: Potential Overflows in ctl_put() functions (Medium)
831 Date Resolved: 21 Mar 2017
832 References: Sec 3379 / CVE-2017-6458 / VU#325339
833 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
834 ntp-4.3.0 up to, but not including ntp-4.3.94.
835 CVSS2: MED 4.6 (AV:N/AC:H/Au:M/C:N/I:N/A:C)
836 CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
838 ntpd makes use of different wrappers around ctl_putdata() to
839 create name/value ntpq (mode 6) response strings. For example,
840 ctl_putstr() is usually used to send string data (variable names
841 or string data). The formatting code was missing a length check
842 for variable names. If somebody explicitly created any unusually
843 long variable names in ntpd (longer than 200-512 bytes, depending
844 on the type of variable), then if any of these variables are
845 added to the response list it would overflow a buffer.
848 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
849 or the NTP Public Services Project Download Page
850 If you don't want to upgrade, then don't setvar variable names
851 longer than 200-512 bytes in your ntp.conf file.
852 Properly monitor your ntpd instances, and auto-restart
853 ntpd (without -g) if it stops running.
855 This weakness was discovered by Cure53.
857 * NTP-01-003 NTP: Improper use of snprintf() in mx4200_send() (Low)
858 Date Resolved: 21 Mar 2017
859 References: Sec 3378 / CVE-2017-6451 / VU#325339
860 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
861 ntp-4.3.0 up to, but not including ntp-4.3.94.
862 CVSS2: LOW 0.8 (AV:L/AC:H/Au:M/C:N/I:N/A:P)
863 CVSS3: LOW 1.8 CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
865 The legacy MX4200 refclock is only built if is specifically
866 enabled, and furthermore additional code changes are required to
867 compile and use it. But it uses the libc functions snprintf()
868 and vsnprintf() incorrectly, which can lead to an out-of-bounds
869 memory write due to an improper handling of the return value of
870 snprintf()/vsnprintf(). Since the return value is used as an
871 iterator and it can be larger than the buffer's size, it is
872 possible for the iterator to point somewhere outside of the
873 allocated buffer space. This results in an out-of-bound memory
874 write. This behavior can be leveraged to overwrite a saved
875 instruction pointer on the stack and gain control over the
876 execution flow. During testing it was not possible to identify
877 any malicious usage for this vulnerability. Specifically, no
878 way for an attacker to exploit this vulnerability was ultimately
879 unveiled. However, it has the potential to be exploited, so the
880 code should be fixed.
881 Mitigation, if you have a Magnavox MX4200 refclock:
882 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
883 or the NTP Public Services Project Download Page.
884 Properly monitor your ntpd instances, and auto-restart
885 ntpd (without -g) if it stops running.
887 This weakness was discovered by Cure53.
889 * NTP-01-002 NTP: Buffer Overflow in ntpq when fetching reslist from a
890 malicious ntpd (Medium)
891 Date Resolved: 21 Mar 2017
892 References: Sec 3377 / CVE-2017-6460 / VU#325339
893 Affects: All versions of ntpq, up to but not including ntp-4.2.8p10, and
894 ntp-4.3.0 up to, but not including ntp-4.3.94.
895 CVSS2: MED 4.9 (AV:N/AC:H/Au:S/C:N/I:N/A:C)
896 CVSS3: MED 4.2 CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
898 A stack buffer overflow in ntpq can be triggered by a malicious
899 ntpd server when ntpq requests the restriction list from the server.
900 This is due to a missing length check in the reslist() function.
901 It occurs whenever the function parses the server's response and
902 encounters a flagstr variable of an excessive length. The string
903 will be copied into a fixed-size buffer, leading to an overflow on
904 the function's stack-frame. Note well that this problem requires
905 a malicious server, and affects ntpq, not ntpd.
907 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
908 or the NTP Public Services Project Download Page
909 If you can't upgrade your version of ntpq then if you want to know
910 the reslist of an instance of ntpd that you do not control,
911 know that if the target ntpd is malicious that it can send back
912 a response that intends to crash your ntpq process.
914 This weakness was discovered by Cure53.
916 * NTP-01-001 NTP: Makefile does not enforce Security Flags (Informational)
917 Date Resolved: 21 Mar 2017
919 Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and
920 ntp-4.3.0 up to, but not including ntp-4.3.94.
924 The build process for NTP has not, by default, provided compile
925 or link flags to offer "hardened" security options. Package
926 maintainers have always been able to provide hardening security
927 flags for their builds. As of ntp-4.2.8p10, the NTP build
928 system has a way to provide OS-specific hardening flags. Please
929 note that this is still not a really great solution because it
930 is specific to NTP builds. It's inefficient to have every
931 package supply, track and maintain this information for every
932 target build. It would be much better if there was a common way
933 for OSes to provide this information in a way that arbitrary
934 packages could benefit from it.
937 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
938 or the NTP Public Services Project Download Page
939 Properly monitor your ntpd instances, and auto-restart
940 ntpd (without -g) if it stops running.
942 This weakness was reported by Cure53.
944 * 0rigin DoS (Medium)
945 Date Resolved: 21 Mar 2017
946 References: Sec 3361 / CVE-2016-9042 / VU#325339
947 Affects: ntp-4.2.8p9 (21 Nov 2016), up to but not including ntp-4.2.8p10
948 CVSS2: MED 4.9 (AV:N/AC:H/Au:N/C:N/I:N/A:C) (worst case)
949 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)
951 An exploitable denial of service vulnerability exists in the
952 origin timestamp check functionality of ntpd 4.2.8p9. A specially
953 crafted unauthenticated network packet can be used to reset the
954 expected origin timestamp for target peers. Legitimate replies
955 from targeted peers will fail the origin timestamp check (TEST2)
956 causing the reply to be dropped and creating a denial of service
957 condition. This vulnerability can only be exploited if the
958 attacker can spoof all of the servers.
961 Configure enough servers/peers that an attacker cannot target
962 all of your time sources.
963 Upgrade to 4.2.8p10, or later, from the NTP Project Download Page
964 or the NTP Public Services Project Download Page
965 Properly monitor your ntpd instances, and auto-restart
966 ntpd (without -g) if it stops running.
968 This weakness was discovered by Matthew Van Gundy of Cisco.
972 * [Bug 3393] clang scan-build findings <perlinger@ntp.org>
973 * [Bug 3363] Support for openssl-1.1.0 without compatibility modes
974 - rework of patch set from <ntp.org@eroen.eu>. <perlinger@ntp.org>
975 * [Bug 3356] Bugfix 3072 breaks multicastclient <perlinger@ntp.org>
976 * [Bug 3216] libntp audio ioctl() args incorrectly cast to int
977 on 4.4BSD-Lite derived platforms <perlinger@ntp.org>
978 - original patch by Majdi S. Abbas
979 * [Bug 3215] 'make distcheck' fails with new BK repo format <perlinger@ntp.org>
980 * [Bug 3173] forking async worker: interrupted pipe I/O <perlinger@ntp.org>
981 - initial patch by Christos Zoulas
982 * [Bug 3139] (...) time_pps_create: Exec format error <perlinger@ntp.org>
983 - move loader API from 'inline' to proper source
984 - augment pathless dlls with absolute path to NTPD
985 - use 'msyslog()' instead of 'printf() 'for reporting trouble
986 * [Bug 3107] Incorrect Logic for Peer Event Limiting <perlinger@ntp.org>
987 - applied patch by Matthew Van Gundy
988 * [Bug 3065] Quiet warnings on NetBSD <perlinger@ntp.org>
989 - applied some of the patches provided by Havard. Not all of them
990 still match the current code base, and I did not touch libopt.
991 * [Bug 3062] Change the process name of forked DNS worker <perlinger@ntp.org>
992 - applied patch by Reinhard Max. See bugzilla for limitations.
993 * [Bug 2923] Trap Configuration Fail <perlinger@ntp.org>
994 - fixed dependency inversion from [Bug 2837]
995 * [Bug 2896] Nothing happens if minsane < maxclock < minclock
996 - produce ERROR log message about dysfunctional daemon. <perlinger@ntp.org>
997 * [Bug 2851] allow -4/-6 on restrict line with mask <perlinger@ntp.org>
998 - applied patch by Miroslav Lichvar for ntp4.2.6 compat
999 * [Bug 2645] out-of-bound pointers in ctl_putsys and decode_bitflags
1000 - Fixed these and some more locations of this pattern.
1001 Probably din't get them all, though. <perlinger@ntp.org>
1002 * Update copyright year.
1005 (4.2.8p9-win) 2017/02/01 Released by Harlan Stenn <stenn@ntp.org>
1007 * [Bug 3144] NTP does not build without openSSL. <perlinger@ntp.org>
1008 - added missed changeset for automatic openssl lib detection
1009 - fixed some minor warning issues
1010 * [Bug 3095] More compatibility with openssl 1.1. <perlinger@ntp.org>
1011 * configure.ac cleanup. stenn@ntp.org
1012 * openssl configure cleanup. stenn@ntp.org
1015 NTP 4.2.8p9 (Harlan Stenn <stenn@ntp.org>, 2016/11/21)
1017 Focus: Security, Bug fixes, enhancements.
1021 In addition to bug fixes and enhancements, this release fixes the
1022 following 1 high- (Windows only), 2 medium-, 2 medium-/low, and
1023 5 low-severity vulnerabilities, and provides 28 other non-security
1024 fixes and improvements:
1027 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1028 References: Sec 3119 / CVE-2016-9311 / VU#633847
1029 Affects: ntp-4.0.90 (21 July 1999), possibly earlier, up to but not
1030 including 4.2.8p9, and ntp-4.3.0 up to but not including ntp-4.3.94.
1031 CVSS2: MED 4.9 (AV:N/AC:H/Au:N/C:N/I:N/A:C)
1032 CVSS3: MED 4.4 CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
1034 ntpd does not enable trap service by default. If trap service
1035 has been explicitly enabled, an attacker can send a specially
1036 crafted packet to cause a null pointer dereference that will
1037 crash ntpd, resulting in a denial of service.
1040 Use "restrict default noquery ..." in your ntp.conf file. Only
1041 allow mode 6 queries from trusted networks and hosts.
1042 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1043 or the NTP Public Services Project Download Page
1044 Properly monitor your ntpd instances, and auto-restart ntpd
1045 (without -g) if it stops running.
1046 Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
1048 * Mode 6 information disclosure and DDoS vector
1049 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1050 References: Sec 3118 / CVE-2016-9310 / VU#633847
1051 Affects: ntp-4.0.90 (21 July 1999), possibly earlier, up to but not
1052 including 4.2.8p9, and ntp-4.3.0 up to but not including ntp-4.3.94.
1053 CVSS2: MED 6.4 (AV:A/AC:L/Au:N/C:N/I:N/A:P)
1054 CVSS3: MED 6.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
1056 An exploitable configuration modification vulnerability exists
1057 in the control mode (mode 6) functionality of ntpd. If, against
1058 long-standing BCP recommendations, "restrict default noquery ..."
1059 is not specified, a specially crafted control mode packet can set
1060 ntpd traps, providing information disclosure and DDoS
1061 amplification, and unset ntpd traps, disabling legitimate
1062 monitoring. A remote, unauthenticated, network attacker can
1063 trigger this vulnerability.
1066 Use "restrict default noquery ..." in your ntp.conf file.
1067 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1068 or the NTP Public Services Project Download Page
1069 Properly monitor your ntpd instances, and auto-restart ntpd
1070 (without -g) if it stops running.
1071 Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
1073 * Broadcast Mode Replay Prevention DoS
1074 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1075 References: Sec 3114 / CVE-2016-7427 / VU#633847
1076 Affects: ntp-4.2.8p6, up to but not including ntp-4.2.8p9, and
1077 ntp-4.3.90 up to, but not including ntp-4.3.94.
1078 CVSS2: LOW 3.3 (AV:A/AC:L/Au:N/C:N/I:N/A:P)
1079 CVSS3: MED 4.3 CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
1081 The broadcast mode of NTP is expected to only be used in a
1082 trusted network. If the broadcast network is accessible to an
1083 attacker, a potentially exploitable denial of service
1084 vulnerability in ntpd's broadcast mode replay prevention
1085 functionality can be abused. An attacker with access to the NTP
1086 broadcast domain can periodically inject specially crafted
1087 broadcast mode NTP packets into the broadcast domain which,
1088 while being logged by ntpd, can cause ntpd to reject broadcast
1089 mode packets from legitimate NTP broadcast servers.
1092 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1093 or the NTP Public Services Project Download Page
1094 Properly monitor your ntpd instances, and auto-restart ntpd
1095 (without -g) if it stops running.
1096 Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
1098 * Broadcast Mode Poll Interval Enforcement DoS
1099 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1100 References: Sec 3113 / CVE-2016-7428 / VU#633847
1101 Affects: ntp-4.2.8p6, up to but not including ntp-4.2.8p9, and
1102 ntp-4.3.90 up to, but not including ntp-4.3.94
1103 CVSS2: LOW 3.3 (AV:A/AC:L/Au:N/C:N/I:N/A:P)
1104 CVSS3: MED 4.3 CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
1106 The broadcast mode of NTP is expected to only be used in a
1107 trusted network. If the broadcast network is accessible to an
1108 attacker, a potentially exploitable denial of service
1109 vulnerability in ntpd's broadcast mode poll interval enforcement
1110 functionality can be abused. To limit abuse, ntpd restricts the
1111 rate at which each broadcast association will process incoming
1112 packets. ntpd will reject broadcast mode packets that arrive
1113 before the poll interval specified in the preceding broadcast
1114 packet expires. An attacker with access to the NTP broadcast
1115 domain can send specially crafted broadcast mode NTP packets to
1116 the broadcast domain which, while being logged by ntpd, will
1117 cause ntpd to reject broadcast mode packets from legitimate NTP
1121 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1122 or the NTP Public Services Project Download Page
1123 Properly monitor your ntpd instances, and auto-restart ntpd
1124 (without -g) if it stops running.
1125 Credit: This weakness was discovered by Matthew Van Gundy of Cisco.
1127 * Windows: ntpd DoS by oversized UDP packet
1128 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1129 References: Sec 3110 / CVE-2016-9312 / VU#633847
1130 Affects Windows only: ntp-4.?.?, up to but not including ntp-4.2.8p9,
1131 and ntp-4.3.0 up to, but not including ntp-4.3.94.
1132 CVSS2: HIGH 7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)
1133 CVSS3: HIGH 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1135 If a vulnerable instance of ntpd on Windows receives a crafted
1136 malicious packet that is "too big", ntpd will stop working.
1139 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1140 or the NTP Public Services Project Download Page
1141 Properly monitor your ntpd instances, and auto-restart ntpd
1142 (without -g) if it stops running.
1143 Credit: This weakness was discovered by Robert Pajak of ABB.
1145 * 0rigin (zero origin) issues
1146 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1147 References: Sec 3102 / CVE-2016-7431 / VU#633847
1148 Affects: ntp-4.2.8p8, and ntp-4.3.93.
1149 CVSS2: MED 5.0 (AV:N/AC:L/Au:N/C:N/I:P/A:N)
1150 CVSS3: MED 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
1152 Zero Origin timestamp problems were fixed by Bug 2945 in
1153 ntp-4.2.8p6. However, subsequent timestamp validation checks
1154 introduced a regression in the handling of some Zero origin
1158 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1159 or the NTP Public Services Project Download Page
1160 Properly monitor your ntpd instances, and auto-restart ntpd
1161 (without -g) if it stops running.
1162 Credit: This weakness was discovered by Sharon Goldberg and Aanchal
1163 Malhotra of Boston University.
1165 * read_mru_list() does inadequate incoming packet checks
1166 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1167 References: Sec 3082 / CVE-2016-7434 / VU#633847
1168 Affects: ntp-4.2.7p22, up to but not including ntp-4.2.8p9, and
1169 ntp-4.3.0 up to, but not including ntp-4.3.94.
1170 CVSS2: LOW 3.8 (AV:L/AC:H/Au:S/C:N/I:N/A:C)
1171 CVSS3: LOW 3.8 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1173 If ntpd is configured to allow mrulist query requests from a
1174 server that sends a crafted malicious packet, ntpd will crash
1175 on receipt of that crafted malicious mrulist query packet.
1177 Only allow mrulist query packets from trusted hosts.
1179 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1180 or the NTP Public Services Project Download Page
1181 Properly monitor your ntpd instances, and auto-restart ntpd
1182 (without -g) if it stops running.
1183 Credit: This weakness was discovered by Magnus Stubman.
1185 * Attack on interface selection
1186 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1187 References: Sec 3072 / CVE-2016-7429 / VU#633847
1188 Affects: ntp-4.2.7p385, up to but not including ntp-4.2.8p9, and
1189 ntp-4.3.0 up to, but not including ntp-4.3.94
1190 CVSS2: LOW 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
1191 CVSS3: LOW 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
1193 When ntpd receives a server response on a socket that corresponds
1194 to a different interface than was used for the request, the peer
1195 structure is updated to use the interface for new requests. If
1196 ntpd is running on a host with multiple interfaces in separate
1197 networks and the operating system doesn't check source address in
1198 received packets (e.g. rp_filter on Linux is set to 0), an
1199 attacker that knows the address of the source can send a packet
1200 with spoofed source address which will cause ntpd to select wrong
1201 interface for the source and prevent it from sending new requests
1202 until the list of interfaces is refreshed, which happens on
1203 routing changes or every 5 minutes by default. If the attack is
1204 repeated often enough (once per second), ntpd will not be able to
1205 synchronize with the source.
1208 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1209 or the NTP Public Services Project Download Page
1210 If you are going to configure your OS to disable source address
1211 checks, also configure your firewall configuration to control
1212 what interfaces can receive packets from what networks.
1213 Properly monitor your ntpd instances, and auto-restart ntpd
1214 (without -g) if it stops running.
1215 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1217 * Client rate limiting and server responses
1218 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1219 References: Sec 3071 / CVE-2016-7426 / VU#633847
1220 Affects: ntp-4.2.5p203, up to but not including ntp-4.2.8p9, and
1221 ntp-4.3.0 up to, but not including ntp-4.3.94
1222 CVSS2: LOW 1.0 (AV:L/AC:H/Au:S/C:N/I:N/A:P)
1223 CVSS3: LOW 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
1225 When ntpd is configured with rate limiting for all associations
1226 (restrict default limited in ntp.conf), the limits are applied
1227 also to responses received from its configured sources. An
1228 attacker who knows the sources (e.g., from an IPv4 refid in
1229 server response) and knows the system is (mis)configured in this
1230 way can periodically send packets with spoofed source address to
1231 keep the rate limiting activated and prevent ntpd from accepting
1232 valid responses from its sources.
1234 While this blanket rate limiting can be useful to prevent
1235 brute-force attacks on the origin timestamp, it allows this DoS
1236 attack. Similarly, it allows the attacker to prevent mobilization
1237 of ephemeral associations.
1240 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1241 or the NTP Public Services Project Download Page
1242 Properly monitor your ntpd instances, and auto-restart ntpd
1243 (without -g) if it stops running.
1244 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1246 * Fix for bug 2085 broke initial sync calculations
1247 Date Resolved: 21 November 2016; Dev (4.3.94) 21 November 2016
1248 References: Sec 3067 / CVE-2016-7433 / VU#633847
1249 Affects: ntp-4.2.7p385, up to but not including ntp-4.2.8p9, and
1250 ntp-4.3.0 up to, but not including ntp-4.3.94. But the
1251 root-distance calculation in general is incorrect in all versions
1252 of ntp-4 until this release.
1253 CVSS2: LOW 1.2 (AV:L/AC:H/Au:N/C:N/I:N/A:P)
1254 CVSS3: LOW 1.6 CVSS:3.0/AV:P/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
1256 Bug 2085 described a condition where the root delay was included
1257 twice, causing the jitter value to be higher than expected. Due
1258 to a misinterpretation of a small-print variable in The Book, the
1259 fix for this problem was incorrect, resulting in a root distance
1260 that did not include the peer dispersion. The calculations and
1261 formulae have been reviewed and reconciled, and the code has been
1262 updated accordingly.
1264 Upgrade to 4.2.8p9, or later, from the NTP Project Download Page
1265 or the NTP Public Services Project Download Page
1266 Properly monitor your ntpd instances, and auto-restart ntpd
1267 (without -g) if it stops running.
1268 Credit: This weakness was discovered independently by Brian Utterback of
1269 Oracle, and Sharon Goldberg and Aanchal Malhotra of Boston University.
1273 * [Bug 3142] bug in netmask prefix length detection <perlinger@ntp.org>
1274 * [Bug 3138] gpsdjson refclock should honor fudgetime1. stenn@ntp.org
1275 * [Bug 3129] Unknown hosts can put resolver thread into a hard loop
1276 - moved retry decision where it belongs. <perlinger@ntp.org>
1277 * [Bug 3125] NTPD doesn't fully start when ntp.conf entries are out of order
1278 using the loopback-ppsapi-provider.dll <perlinger@ntp.org>
1279 * [Bug 3116] unit tests for NTP time stamp expansion. <perlinger@ntp.org>
1280 * [Bug 3100] ntpq can't retrieve daemon_version <perlinger@ntp.org>
1281 - fixed extended sysvar lookup (bug introduced with bug 3008 fix)
1282 * [Bug 3095] Compatibility with openssl 1.1 <perlinger@ntp.org>
1283 - applied patches by Kurt Roeckx <kurt@roeckx.be> to source
1284 - added shim layer for SSL API calls with issues (both directions)
1285 * [Bug 3089] Serial Parser does not work anymore for hopfser like device
1286 - simplified / refactored hex-decoding in driver. <perlinger@ntp.org>
1287 * [Bug 3084] update-leap mis-parses the leapfile name. HStenn.
1288 * [Bug 3068] Linker warnings when building on Solaris. perlinger@ntp.org
1289 - applied patch thanks to Andrew Stormont <andyjstormont@gmail.com>
1290 * [Bug 3067] Root distance calculation needs improvement. HStenn
1291 * [Bug 3066] NMEA clock ignores pps. perlinger@ntp.org
1292 - PPS-HACK works again.
1293 * [Bug 3059] Potential buffer overrun from oversized hash <perlinger@ntp.org>
1294 - applied patch by Brian Utterback <brian.utterback@oracle.com>
1295 * [Bug 3053] ntp_loopfilter.c frequency calc precedence error. Sarah White.
1296 * [Bug 3050] Fix for bug #2960 causes [...] spurious error message.
1298 - patches by Reinhard Max <max@suse.com> and Havard Eidnes <he@uninett.no>
1299 * [Bug 3047] Fix refclock_jjy C-DEX JST2000. abe@ntp.org
1300 - Patch provided by Kuramatsu.
1301 * [Bug 3021] unity_fixture.c needs pragma weak <perlinger@ntp.org>
1302 - removed unnecessary & harmful decls of 'setUp()' & 'tearDown()'
1303 * [Bug 3019] Windows: ERROR_HOST_UNREACHABLE block packet processing. DMayer
1304 * [Bug 2998] sntp/tests/packetProcessing.c broken without openssl. JPerlinger
1305 * [Bug 2961] sntp/tests/packetProcessing.c assumes AUTOKEY. HStenn.
1306 * [Bug 2959] refclock_jupiter: gps week correction <perlinger@ntp.org>
1307 - fixed GPS week expansion to work based on build date. Special thanks
1308 to Craig Leres for initial patch and testing.
1309 * [Bug 2951] ntpd tests fail: multiple definition of `send_via_ntp_signd'
1310 - fixed Makefile.am <perlinger@ntp.org>
1311 * [Bug 2689] ATOM driver processes last PPS pulse at startup,
1312 even if it is very old <perlinger@ntp.org>
1313 - make sure PPS source is alive before processing samples
1314 - improve stability close to the 500ms phase jump (phase gate)
1315 * Fix typos in include/ntp.h.
1316 * Shim X509_get_signature_nid() if needed
1317 * git author attribution cleanup
1318 * bk ignore file cleanup
1319 * remove locks in Windows IO, use rpc-like thread synchronisation instead
1322 NTP 4.2.8p8 (Harlan Stenn <stenn@ntp.org>, 2016/06/02)
1324 Focus: Security, Bug fixes, enhancements.
1328 In addition to bug fixes and enhancements, this release fixes the
1329 following 1 high- and 4 low-severity vulnerabilities:
1332 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1333 References: Sec 3046 / CVE-2016-4957 / VU#321640
1334 Affects: ntp-4.2.8p7, and ntp-4.3.92.
1335 CVSS2: HIGH 7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)
1336 CVSS3: HIGH 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1337 Summary: The fix for Sec 3007 in ntp-4.2.8p7 contained a bug that
1338 could cause ntpd to crash.
1341 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1342 or the NTP Public Services Project Download Page
1343 If you cannot upgrade from 4.2.8p7, the only other alternatives
1344 are to patch your code or filter CRYPTO_NAK packets.
1345 Properly monitor your ntpd instances, and auto-restart ntpd
1346 (without -g) if it stops running.
1347 Credit: This weakness was discovered by Nicolas Edet of Cisco.
1349 * Bad authentication demobilizes ephemeral associations
1350 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1351 References: Sec 3045 / CVE-2016-4953 / VU#321640
1352 Affects: ntp-4, up to but not including ntp-4.2.8p8, and
1353 ntp-4.3.0 up to, but not including ntp-4.3.93.
1354 CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
1355 CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1356 Summary: An attacker who knows the origin timestamp and can send a
1357 spoofed packet containing a CRYPTO-NAK to an ephemeral peer
1358 target before any other response is sent can demobilize that
1362 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1363 or the NTP Public Services Project Download Page
1364 Properly monitor your ntpd instances.
1365 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1367 * Processing spoofed server packets
1368 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1369 References: Sec 3044 / CVE-2016-4954 / VU#321640
1370 Affects: ntp-4, up to but not including ntp-4.2.8p8, and
1371 ntp-4.3.0 up to, but not including ntp-4.3.93.
1372 CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
1373 CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1374 Summary: An attacker who is able to spoof packets with correct origin
1375 timestamps from enough servers before the expected response
1376 packets arrive at the target machine can affect some peer
1377 variables and, for example, cause a false leap indication to be set.
1380 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1381 or the NTP Public Services Project Download Page
1382 Properly monitor your ntpd instances.
1383 Credit: This weakness was discovered by Jakub Prokes of Red Hat.
1385 * Autokey association reset
1386 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1387 References: Sec 3043 / CVE-2016-4955 / VU#321640
1388 Affects: ntp-4, up to but not including ntp-4.2.8p8, and
1389 ntp-4.3.0 up to, but not including ntp-4.3.93.
1390 CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
1391 CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1392 Summary: An attacker who is able to spoof a packet with a correct
1393 origin timestamp before the expected response packet arrives at
1394 the target machine can send a CRYPTO_NAK or a bad MAC and cause
1395 the association's peer variables to be cleared. If this can be
1396 done often enough, it will prevent that association from working.
1399 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1400 or the NTP Public Services Project Download Page
1401 Properly monitor your ntpd instances.
1402 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1404 * Broadcast interleave
1405 Date Resolved: 02 June 2016; Dev (4.3.93) 02 June 2016
1406 References: Sec 3042 / CVE-2016-4956 / VU#321640
1407 Affects: ntp-4, up to but not including ntp-4.2.8p8, and
1408 ntp-4.3.0 up to, but not including ntp-4.3.93.
1409 CVSS2: LOW 2.6 (AV:N/AC:H/Au:N/C:N/I:N/A:P)
1410 CVSS3: LOW 3.7 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1411 Summary: The fix for NtpBug2978 does not cover broadcast associations,
1412 so broadcast clients can be triggered to flip into interleave mode.
1415 Upgrade to 4.2.8p8, or later, from the NTP Project Download Page
1416 or the NTP Public Services Project Download Page
1417 Properly monitor your ntpd instances.
1418 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
1421 * [Bug 3038] NTP fails to build in VS2015. perlinger@ntp.org
1422 - provide build environment
1423 - 'wint_t' and 'struct timespec' defined by VS2015
1424 - fixed print()/scanf() format issues
1425 * [Bug 3052] Add a .gitignore file. Edmund Wong.
1426 * [Bug 3054] miscopt.html documents the allan intercept in seconds. SWhite.
1427 * [Bug 3058] fetch_timestamp() mishandles 64-bit alignment. Brian Utterback,
1429 * Fix typo in ntp-wait and plot_summary. HStenn.
1430 * Make sure we have an "author" file for git imports. HStenn.
1431 * Update the sntp problem tests for MacOS. HStenn.
1434 NTP 4.2.8p7 (Harlan Stenn <stenn@ntp.org>, 2016/04/26)
1436 Focus: Security, Bug fixes, enhancements.
1440 When building NTP from source, there is a new configure option
1441 available, --enable-dynamic-interleave. More information on this below.
1443 Also note that ntp-4.2.8p7 logs more "unexpected events" than previous
1444 versions of ntp. These events have almost certainly happened in the
1445 past, it's just that they were silently counted and not logged. With
1446 the increasing awareness around security, we feel it's better to clearly
1447 log these events to help detect abusive behavior. This increased
1448 logging can also help detect other problems, too.
1450 In addition to bug fixes and enhancements, this release fixes the
1451 following 9 low- and medium-severity vulnerabilities:
1453 * Improve NTP security against buffer comparison timing attacks,
1454 AKA: authdecrypt-timing
1455 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1456 References: Sec 2879 / CVE-2016-1550
1457 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1458 4.3.0 up to, but not including 4.3.92
1459 CVSSv2: LOW 2.6 - (AV:L/AC:H/Au:N/C:P/I:P/A:N)
1460 CVSSv3: MED 4.0 - CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
1461 Summary: Packet authentication tests have been performed using
1462 memcmp() or possibly bcmp(), and it is potentially possible
1463 for a local or perhaps LAN-based attacker to send a packet with
1464 an authentication payload and indirectly observe how much of
1465 the digest has matched.
1467 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1468 or the NTP Public Services Project Download Page.
1469 Properly monitor your ntpd instances.
1470 Credit: This weakness was discovered independently by Loganaden
1471 Velvindron, and Matthew Van Gundy and Stephen Gray of Cisco ASIG.
1473 * Zero origin timestamp bypass: Additional KoD checks.
1474 References: Sec 2945 / Sec 2901 / CVE-2015-8138
1475 Affects: All ntp-4 releases up to, but not including 4.2.8p7,
1476 Summary: Improvements to the fixes incorporated in t 4.2.8p6 and 4.3.92.
1478 * peer associations were broken by the fix for NtpBug2899
1479 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1480 References: Sec 2952 / CVE-2015-7704
1481 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1482 4.3.0 up to, but not including 4.3.92
1483 CVSSv2: MED 4.3 - (AV:N/AC:M/Au:N/C:N/I:N/A:P)
1484 Summary: The fix for NtpBug2952 in ntp-4.2.8p5 to address broken peer
1485 associations did not address all of the issues.
1488 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1489 or the NTP Public Services Project Download Page
1490 If you can't upgrade, use "server" associations instead of
1491 "peer" associations.
1492 Monitor your ntpd instances.
1493 Credit: This problem was discovered by Michael Tatarinov.
1495 * Validate crypto-NAKs, AKA: CRYPTO-NAK DoS
1496 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1497 References: Sec 3007 / CVE-2016-1547 / VU#718152
1498 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1499 4.3.0 up to, but not including 4.3.92
1500 CVSS2: MED 4.3 - (AV:N/AC:M/Au:N/C:N/I:N/A:P)
1501 CVSS3: MED 3.7 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
1502 Summary: For ntp-4 versions up to but not including ntp-4.2.8p7, an
1503 off-path attacker can cause a preemptable client association to
1504 be demobilized by sending a crypto NAK packet to a victim client
1505 with a spoofed source address of an existing associated peer.
1506 This is true even if authentication is enabled.
1508 Furthermore, if the attacker keeps sending crypto NAK packets,
1509 for example one every second, the victim never has a chance to
1510 reestablish the association and synchronize time with that
1513 For ntp-4.2.8 thru ntp-4.2.8p6 there is less risk because more
1514 stringent checks are performed on incoming packets, but there
1515 are still ways to exploit this vulnerability in versions before
1519 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1520 or the NTP Public Services Project Download Page
1521 Properly monitor your ntpd instances
1522 Credit: This weakness was discovered by Stephen Gray and
1523 Matthew Van Gundy of Cisco ASIG.
1525 * ctl_getitem() return value not always checked
1526 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1527 References: Sec 3008 / CVE-2016-2519
1528 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1529 4.3.0 up to, but not including 4.3.92
1530 CVSSv2: MED 4.9 - (AV:N/AC:H/Au:S/C:N/I:N/A:C)
1531 CVSSv3: MED 4.2 - CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1532 Summary: ntpq and ntpdc can be used to store and retrieve information
1533 in ntpd. It is possible to store a data value that is larger
1534 than the size of the buffer that the ctl_getitem() function of
1535 ntpd uses to report the return value. If the length of the
1536 requested data value returned by ctl_getitem() is too large,
1537 the value NULL is returned instead. There are 2 cases where the
1538 return value from ctl_getitem() was not directly checked to make
1539 sure it's not NULL, but there are subsequent INSIST() checks
1540 that make sure the return value is not NULL. There are no data
1541 values ordinarily stored in ntpd that would exceed this buffer
1542 length. But if one has permission to store values and one stores
1543 a value that is "too large", then ntpd will abort if an attempt
1544 is made to read that oversized value.
1547 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1548 or the NTP Public Services Project Download Page
1549 Properly monitor your ntpd instances.
1550 Credit: This weakness was discovered by Yihan Lian of the Cloud
1551 Security Team, Qihoo 360.
1553 * Crafted addpeer with hmode > 7 causes array wraparound with MATCH_ASSOC
1554 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1555 References: Sec 3009 / CVE-2016-2518 / VU#718152
1556 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1557 4.3.0 up to, but not including 4.3.92
1558 CVSS2: LOW 2.1 - (AV:N/AC:H/Au:S/C:N/I:N/A:P)
1559 CVSS3: LOW 2.0 - CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L
1560 Summary: Using a crafted packet to create a peer association with
1561 hmode > 7 causes the MATCH_ASSOC() lookup to make an
1562 out-of-bounds reference.
1565 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1566 or the NTP Public Services Project Download Page
1567 Properly monitor your ntpd instances
1568 Credit: This weakness was discovered by Yihan Lian of the Cloud
1569 Security Team, Qihoo 360.
1571 * remote configuration trustedkey/requestkey/controlkey values are not
1573 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1574 References: Sec 3010 / CVE-2016-2517 / VU#718152
1575 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1576 4.3.0 up to, but not including 4.3.92
1577 CVSS2: MED 4.9 - (AV:N/AC:H/Au:S/C:N/I:N/A:C)
1578 CVSS3: MED 4.2 - CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1579 Summary: If ntpd was expressly configured to allow for remote
1580 configuration, a malicious user who knows the controlkey for
1581 ntpq or the requestkey for ntpdc (if mode7 is expressly enabled)
1582 can create a session with ntpd and then send a crafted packet to
1583 ntpd that will change the value of the trustedkey, controlkey,
1584 or requestkey to a value that will prevent any subsequent
1585 authentication with ntpd until ntpd is restarted.
1588 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1589 or the NTP Public Services Project Download Page
1590 Properly monitor your ntpd instances
1591 Credit: This weakness was discovered by Yihan Lian of the Cloud
1592 Security Team, Qihoo 360.
1594 * Duplicate IPs on unconfig directives will cause an assertion botch in ntpd
1595 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1596 References: Sec 3011 / CVE-2016-2516 / VU#718152
1597 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1598 4.3.0 up to, but not including 4.3.92
1599 CVSS2: MED 6.3 - (AV:N/AC:M/Au:S/C:N/I:N/A:C)
1600 CVSS3: MED 4.2 - CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
1601 Summary: If ntpd was expressly configured to allow for remote
1602 configuration, a malicious user who knows the controlkey for
1603 ntpq or the requestkey for ntpdc (if mode7 is expressly enabled)
1604 can create a session with ntpd and if an existing association is
1605 unconfigured using the same IP twice on the unconfig directive
1606 line, ntpd will abort.
1609 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1610 or the NTP Public Services Project Download Page
1611 Properly monitor your ntpd instances
1612 Credit: This weakness was discovered by Yihan Lian of the Cloud
1613 Security Team, Qihoo 360.
1615 * Refclock impersonation vulnerability
1616 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1617 References: Sec 3020 / CVE-2016-1551
1618 Affects: On a very limited number of OSes, all NTP releases up to but
1619 not including 4.2.8p7, and 4.3.0 up to but not including 4.3.92.
1620 By "very limited number of OSes" we mean no general-purpose OSes
1621 have yet been identified that have this vulnerability.
1622 CVSSv2: LOW 2.6 - (AV:N/AC:H/Au:N/C:N/I:P/A:N)
1623 CVSSv3: LOW 3.7 - CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
1624 Summary: While most OSes implement martian packet filtering in their
1625 network stack, at least regarding 127.0.0.0/8, some will allow
1626 packets claiming to be from 127.0.0.0/8 that arrive over a
1627 physical network. On these OSes, if ntpd is configured to use a
1628 reference clock an attacker can inject packets over the network
1629 that look like they are coming from that reference clock.
1631 Implement martian packet filtering and BCP-38.
1632 Configure ntpd to use an adequate number of time sources.
1633 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1634 or the NTP Public Services Project Download Page
1635 If you are unable to upgrade and if you are running an OS that
1636 has this vulnerability, implement martian packet filters and
1637 lobby your OS vendor to fix this problem, or run your
1638 refclocks on computers that use OSes that are not vulnerable
1639 to these attacks and have your vulnerable machines get their
1640 time from protected resources.
1641 Properly monitor your ntpd instances.
1642 Credit: This weakness was discovered by Matt Street and others of
1645 The following issues were fixed in earlier releases and contain
1646 improvements in 4.2.8p7:
1648 * Clients that receive a KoD should validate the origin timestamp field.
1649 References: Sec 2901 / CVE-2015-7704, CVE-2015-7705
1650 Affects: All ntp-4 releases up to, but not including 4.2.8p7,
1651 Summary: Improvements to the fixes incorporated into 4.2.8p4 and 4.3.77.
1653 * Skeleton key: passive server with trusted key can serve time.
1654 References: Sec 2936 / CVE-2015-7974
1655 Affects: All ntp-4 releases up to, but not including 4.2.8p7,
1656 Summary: Improvements to the fixes incorporated in t 4.2.8p6 and 4.3.90.
1658 Two other vulnerabilities have been reported, and the mitigations
1659 for these are as follows:
1662 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1663 References: Sec 2978 / CVE-2016-1548
1664 Affects: All ntp-4 releases.
1665 CVSSv2: MED 6.4 - (AV:N/AC:L/Au:N/C:N/I:P/A:P)
1666 CVSSv3: MED 7.2 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
1667 Summary: It is possible to change the time of an ntpd client or deny
1668 service to an ntpd client by forcing it to change from basic
1669 client/server mode to interleaved symmetric mode. An attacker
1670 can spoof a packet from a legitimate ntpd server with an origin
1671 timestamp that matches the peer->dst timestamp recorded for that
1672 server. After making this switch, the client will reject all
1673 future legitimate server responses. It is possible to force the
1674 victim client to move time after the mode has been changed.
1675 ntpq gives no indication that the mode has been switched.
1678 Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
1679 or the NTP Public Services Project Download Page. These
1680 versions will not dynamically "flip" into interleave mode
1681 unless configured to do so.
1682 Properly monitor your ntpd instances.
1683 Credit: This weakness was discovered by Miroslav Lichvar of RedHat
1684 and separately by Jonathan Gardner of Cisco ASIG.
1686 * Sybil vulnerability: ephemeral association attack
1687 Date Resolved: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
1688 References: Sec 3012 / CVE-2016-1549
1689 Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
1690 4.3.0 up to, but not including 4.3.92
1691 CVSSv2: LOW 3.5 - (AV:N/AC:M/Au:S/C:N/I:P/A:N)
1692 CVSS3v: MED 5.3 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
1693 Summary: ntpd can be vulnerable to Sybil attacks. If one is not using
1694 the feature introduced in ntp-4.2.8p6 allowing an optional 4th
1695 field in the ntp.keys file to specify which IPs can serve time,
1696 a malicious authenticated peer can create arbitrarily-many
1697 ephemeral associations in order to win the clock selection of
1698 ntpd and modify a victim's clock.
1701 Use the 4th field in the ntp.keys file to specify which IPs
1702 can be time servers.
1703 Properly monitor your ntpd instances.
1704 Credit: This weakness was discovered by Matthew Van Gundy of Cisco ASIG.
1708 * [Bug 2831] Segmentation Fault in DNS lookup during startup. perlinger@ntp.org
1709 - fixed yet another race condition in the threaded resolver code.
1710 * [Bug 2858] bool support. Use stdbool.h when available. HStenn.
1711 * [Bug 2879] Improve NTP security against timing attacks. perlinger@ntp.org
1712 - integrated patches by Loganaden Velvidron <logan@ntp.org>
1713 with some modifications & unit tests
1714 * [Bug 2960] async name resolution fixes for chroot() environments.
1716 * [Bug 2994] Systems with HAVE_SIGNALED_IO fail to compile. perlinger@ntp.org
1717 * [Bug 2995] Fixes to compile on Windows
1718 * [Bug 2999] out-of-bounds access in 'is_safe_filename()'. perlinger@ntp.org
1719 * [Bug 3013] Fix for ssl_init.c SHA1 test. perlinger@ntp.org
1720 - Patch provided by Ch. Weisgerber
1721 * [Bug 3015] ntpq: config-from-file: "request contains an unprintable character"
1722 - A change related to [Bug 2853] forbids trailing white space in
1723 remote config commands. perlinger@ntp.org
1724 * [Bug 3019] NTPD stops processing packets after ERROR_HOST_UNREACHABLE
1725 - report and patch from Aleksandr Kostikov.
1726 - Overhaul of Windows IO completion port handling. perlinger@ntp.org
1727 * [Bug 3022] authkeys.c should be refactored. perlinger@ntp.org
1728 - fixed memory leak in access list (auth[read]keys.c)
1729 - refactored handling of key access lists (auth[read]keys.c)
1730 - reduced number of error branches (authreadkeys.c)
1731 * [Bug 3023] ntpdate cannot correct dates in the future. perlinger@ntp.org
1732 * [Bug 3030] ntpq needs a general way to specify refid output format. HStenn.
1733 * [Bug 3031] ntp broadcastclient unable to synchronize to an server
1734 when the time of server changed. perlinger@ntp.org
1735 - Check the initial delay calculation and reject/unpeer the broadcast
1736 server if the delay exceeds 50ms. Retry again after the next
1738 * [Bug 3036] autokey trips an INSIST in authistrustedip(). Harlan Stenn.
1739 * Document ntp.key's optional IP list in authenetic.html. Harlan Stenn.
1740 * Update html/xleave.html documentation. Harlan Stenn.
1741 * Update ntp.conf documentation. Harlan Stenn.
1742 * Fix some Credit: attributions in the NEWS file. Harlan Stenn.
1743 * Fix typo in html/monopt.html. Harlan Stenn.
1744 * Add README.pullrequests. Harlan Stenn.
1745 * Cleanup to include/ntp.h. Harlan Stenn.
1747 New option to 'configure':
1749 While looking in to the issues around Bug 2978, the "interleave pivot"
1750 issue, it became clear that there are some intricate and unresolved
1751 issues with interleave operations. We also realized that the interleave
1752 protocol was never added to the NTPv4 Standard, and it should have been.
1754 Interleave mode was first released in July of 2008, and can be engaged
1755 in two ways. Any 'peer' and 'broadcast' lines in the ntp.conf file may
1756 contain the 'xleave' option, which will expressly enable interlave mode
1757 for that association. Additionally, if a time packet arrives and is
1758 found inconsistent with normal protocol behavior but has certain
1759 characteristics that are compatible with interleave mode, NTP will
1760 dynamically switch to interleave mode. With sufficient knowledge, an
1761 attacker can send a crafted forged packet to an NTP instance that
1762 triggers only one side to enter interleaved mode.
1764 To prevent this attack until we can thoroughly document, describe,
1765 fix, and test the dynamic interleave mode, we've added a new
1766 'configure' option to the build process:
1768 --enable-dynamic-interleave
1770 This option controls whether or not NTP will, if conditions are right,
1771 engage dynamic interleave mode. Dynamic interleave mode is disabled by
1772 default in ntp-4.2.8p7.
1775 NTP 4.2.8p6 (Harlan Stenn <stenn@ntp.org>, 2016/01/20)
1777 Focus: Security, Bug fixes, enhancements.
1781 In addition to bug fixes and enhancements, this release fixes the
1782 following 1 low- and 8 medium-severity vulnerabilities:
1784 * Potential Infinite Loop in 'ntpq'
1785 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1786 References: Sec 2548 / CVE-2015-8158
1787 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1788 4.3.0 up to, but not including 4.3.90
1789 CVSS2: (AV:N/AC:M/Au:N/C:N/I:N/A:P) Base Score: 4.3 - MEDIUM
1790 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Base Score: 5.3 - MEDIUM
1791 Summary: 'ntpq' processes incoming packets in a loop in 'getresponse()'.
1792 The loop's only stopping conditions are receiving a complete and
1793 correct response or hitting a small number of error conditions.
1794 If the packet contains incorrect values that don't trigger one of
1795 the error conditions, the loop continues to receive new packets.
1796 Note well, this is an attack against an instance of 'ntpq', not
1797 'ntpd', and this attack requires the attacker to do one of the
1799 * Own a malicious NTP server that the client trusts
1800 * Prevent a legitimate NTP server from sending packets to
1802 * MITM the 'ntpq' communications between the 'ntpq' client
1805 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
1806 or the NTP Public Services Project Download Page
1807 Credit: This weakness was discovered by Jonathan Gardner of Cisco ASIG.
1809 * 0rigin: Zero Origin Timestamp Bypass
1810 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1811 References: Sec 2945 / CVE-2015-8138
1812 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1813 4.3.0 up to, but not including 4.3.90
1814 CVSS2: (AV:N/AC:L/Au:N/C:N/I:P/A:N) Base Score: 5.0 - MEDIUM
1815 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Base Score: 5.3 - MEDIUM
1816 (3.7 - LOW if you score AC:L)
1817 Summary: To distinguish legitimate peer responses from forgeries, a
1818 client attempts to verify a response packet by ensuring that the
1819 origin timestamp in the packet matches the origin timestamp it
1820 transmitted in its last request. A logic error exists that
1821 allows packets with an origin timestamp of zero to bypass this
1822 check whenever there is not an outstanding request to the server.
1824 Configure 'ntpd' to get time from multiple sources.
1825 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
1826 or the NTP Public Services Project Download Page.
1827 Monitor your 'ntpd' instances.
1828 Credit: This weakness was discovered by Matthey Van Gundy and
1829 Jonathan Gardner of Cisco ASIG.
1831 * Stack exhaustion in recursive traversal of restriction list
1832 Date Resolved: Stable (4.2.8p6) 19 Jan 2016
1833 References: Sec 2940 / CVE-2015-7978
1834 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1835 4.3.0 up to, but not including 4.3.90
1836 CVSS: (AV:N/AC:M/Au:N/C:N/I:N/A:P) Base Score: 4.3 - MEDIUM
1837 Summary: An unauthenticated 'ntpdc reslist' command can cause a
1838 segmentation fault in ntpd by exhausting the call stack.
1841 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
1842 or the NTP Public Services Project Download Page.
1843 If you are unable to upgrade:
1844 In ntp-4.2.8, mode 7 is disabled by default. Don't enable it.
1845 If you must enable mode 7:
1846 configure the use of a 'requestkey' to control who can
1847 issue mode 7 requests.
1848 configure 'restrict noquery' to further limit mode 7
1849 requests to trusted sources.
1850 Monitor your ntpd instances.
1851 Credit: This weakness was discovered by Stephen Gray at Cisco ASIG.
1853 * Off-path Denial of Service (!DoS) attack on authenticated broadcast mode
1854 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1855 References: Sec 2942 / CVE-2015-7979
1856 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1857 4.3.0 up to, but not including 4.3.90
1858 CVSS: (AV:N/AC:M/Au:N/C:N/I:P/A:P) Base Score: 5.8
1859 Summary: An off-path attacker can send broadcast packets with bad
1860 authentication (wrong key, mismatched key, incorrect MAC, etc)
1861 to broadcast clients. It is observed that the broadcast client
1862 tears down the association with the broadcast server upon
1863 receiving just one bad packet.
1866 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
1867 or the NTP Public Services Project Download Page.
1868 Monitor your 'ntpd' instances.
1869 If this sort of attack is an active problem for you, you have
1870 deeper problems to investigate. In this case also consider
1871 having smaller NTP broadcast domains.
1872 Credit: This weakness was discovered by Aanchal Malhotra of Boston
1875 * reslist NULL pointer dereference
1876 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1877 References: Sec 2939 / CVE-2015-7977
1878 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1879 4.3.0 up to, but not including 4.3.90
1880 CVSS: (AV:N/AC:M/Au:N/C:N/I:N/A:P) Base Score: 4.3 - MEDIUM
1881 Summary: An unauthenticated 'ntpdc reslist' command can cause a
1882 segmentation fault in ntpd by causing a NULL pointer dereference.
1885 Upgrade to 4.2.8p6, or later, from NTP Project Download Page or
1886 the NTP Public Services Project Download Page.
1887 If you are unable to upgrade:
1888 mode 7 is disabled by default. Don't enable it.
1889 If you must enable mode 7:
1890 configure the use of a 'requestkey' to control who can
1891 issue mode 7 requests.
1892 configure 'restrict noquery' to further limit mode 7
1893 requests to trusted sources.
1894 Monitor your ntpd instances.
1895 Credit: This weakness was discovered by Stephen Gray of Cisco ASIG.
1897 * 'ntpq saveconfig' command allows dangerous characters in filenames.
1898 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1899 References: Sec 2938 / CVE-2015-7976
1900 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1901 4.3.0 up to, but not including 4.3.90
1902 CVSS: (AV:N/AC:L/Au:S/C:N/I:P/A:N) Base Score: 4.0 - MEDIUM
1903 Summary: The ntpq saveconfig command does not do adequate filtering
1904 of special characters from the supplied filename.
1905 Note well: The ability to use the saveconfig command is controlled
1906 by the 'restrict nomodify' directive, and the recommended default
1907 configuration is to disable this capability. If the ability to
1908 execute a 'saveconfig' is required, it can easily (and should) be
1909 limited and restricted to a known small number of IP addresses.
1912 use 'restrict default nomodify' in your 'ntp.conf' file.
1913 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page.
1914 If you are unable to upgrade:
1915 build NTP with 'configure --disable-saveconfig' if you will
1916 never need this capability, or
1917 use 'restrict default nomodify' in your 'ntp.conf' file. Be
1918 careful about what IPs have the ability to send 'modify'
1920 Monitor your ntpd instances.
1921 'saveconfig' requests are logged to syslog - monitor your syslog files.
1922 Credit: This weakness was discovered by Jonathan Gardner of Cisco ASIG.
1924 * nextvar() missing length check in ntpq
1925 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1926 References: Sec 2937 / CVE-2015-7975
1927 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1928 4.3.0 up to, but not including 4.3.90
1929 CVSS: (AV:L/AC:H/Au:N/C:N/I:N/A:P) Base Score: 1.2 - LOW
1930 If you score A:C, this becomes 4.0.
1931 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
1932 Summary: ntpq may call nextvar() which executes a memcpy() into the
1933 name buffer without a proper length check against its maximum
1934 length of 256 bytes. Note well that we're taking about ntpq here.
1935 The usual worst-case effect of this vulnerability is that the
1936 specific instance of ntpq will crash and the person or process
1937 that did this will have stopped themselves.
1939 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
1940 or the NTP Public Services Project Download Page.
1941 If you are unable to upgrade:
1942 If you have scripts that feed input to ntpq make sure there are
1943 some sanity checks on the input received from the "outside".
1944 This is potentially more dangerous if ntpq is run as root.
1945 Credit: This weakness was discovered by Jonathan Gardner at Cisco ASIG.
1947 * Skeleton Key: Any trusted key system can serve time
1948 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1949 References: Sec 2936 / CVE-2015-7974
1950 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1951 4.3.0 up to, but not including 4.3.90
1952 CVSS: (AV:N/AC:H/Au:S/C:N/I:C/A:N) Base Score: 4.9
1953 Summary: Symmetric key encryption uses a shared trusted key. The
1954 reported title for this issue was "Missing key check allows
1955 impersonation between authenticated peers" and the report claimed
1956 "A key specified only for one server should only work to
1957 authenticate that server, other trusted keys should be refused."
1958 Except there has never been any correlation between this trusted
1959 key and server v. clients machines and there has never been any
1960 way to specify a key only for one server. We have treated this as
1961 an enhancement request, and ntp-4.2.8p6 includes other checks and
1962 tests to strengthen clients against attacks coming from broadcast
1966 If this scenario represents a real or a potential issue for you,
1967 upgrade to 4.2.8p6, or later, from the NTP Project Download
1968 Page or the NTP Public Services Project Download Page, and
1969 use the new field in the ntp.keys file that specifies the list
1970 of IPs that are allowed to serve time. Note that this alone
1971 will not protect against time packets with forged source IP
1972 addresses, however other changes in ntp-4.2.8p6 provide
1973 significant mitigation against broadcast attacks. MITM attacks
1974 are a different story.
1975 If you are unable to upgrade:
1976 Don't use broadcast mode if you cannot monitor your client
1978 If you choose to use symmetric keys to authenticate time
1979 packets in a hostile environment where ephemeral time
1980 servers can be created, or if it is expected that malicious
1981 time servers will participate in an NTP broadcast domain,
1982 limit the number of participating systems that participate
1983 in the shared-key group.
1984 Monitor your ntpd instances.
1985 Credit: This weakness was discovered by Matt Street of Cisco ASIG.
1987 * Deja Vu: Replay attack on authenticated broadcast mode
1988 Date Resolved: Stable (4.2.8p6) 19 Jan 2016; Dev (4.3.90) 19 Jan 2016
1989 References: Sec 2935 / CVE-2015-7973
1990 Affects: All ntp-4 releases up to, but not including 4.2.8p6, and
1991 4.3.0 up to, but not including 4.3.90
1992 CVSS: (AV:A/AC:M/Au:N/C:N/I:P/A:P) Base Score: 4.3 - MEDIUM
1993 Summary: If an NTP network is configured for broadcast operations then
1994 either a man-in-the-middle attacker or a malicious participant
1995 that has the same trusted keys as the victim can replay time packets.
1998 Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
1999 or the NTP Public Services Project Download Page.
2000 If you are unable to upgrade:
2001 Don't use broadcast mode if you cannot monitor your client servers.
2002 Monitor your ntpd instances.
2003 Credit: This weakness was discovered by Aanchal Malhotra of Boston
2008 * [Bug 2772] adj_systime overflows tv_usec. perlinger@ntp.org
2009 * [Bug 2814] msyslog deadlock when signaled. perlinger@ntp.org
2010 - applied patch by shenpeng11@huawei.com with minor adjustments
2011 * [Bug 2882] Look at ntp_request.c:list_peers_sum(). perlinger@ntp.org
2012 * [Bug 2891] Deadlock in deferred DNS lookup framework. perlinger@ntp.org
2013 * [Bug 2892] Several test cases assume IPv6 capabilities even when
2014 IPv6 is disabled in the build. perlinger@ntp.org
2015 - Found this already fixed, but validation led to cleanup actions.
2016 * [Bug 2905] DNS lookups broken. perlinger@ntp.org
2017 - added limits to stack consumption, fixed some return code handling
2018 * [Bug 2971] ntpq bails on ^C: select fails: Interrupted system call
2019 - changed stacked/nested handling of CTRL-C. perlinger@ntp.org
2020 - make CTRL-C work for retrieval and printing od MRU list. perlinger@ntp.org
2021 * [Bug 2980] reduce number of warnings. perlinger@ntp.org
2022 - integrated several patches from Havard Eidnes (he@uninett.no)
2023 * [Bug 2985] bogus calculation in authkeys.c perlinger@ntp.org
2024 - implement 'auth_log2()' using integer bithack instead of float calculation
2025 * Make leapsec_query debug messages less verbose. Harlan Stenn.
2028 NTP 4.2.8p5 (Harlan Stenn <stenn@ntp.org>, 2016/01/07)
2030 Focus: Security, Bug fixes, enhancements.
2034 In addition to bug fixes and enhancements, this release fixes the
2035 following medium-severity vulnerability:
2037 * Small-step/big-step. Close the panic gate earlier.
2038 References: Sec 2956, CVE-2015-5300
2039 Affects: All ntp-4 releases up to, but not including 4.2.8p5, and
2040 4.3.0 up to, but not including 4.3.78
2041 CVSS3: (AV:N/AC:H/PR:H/UI:R/S:C/C:L/I:N/A:L) Base Score: 4.0, MEDIUM
2042 Summary: If ntpd is always started with the -g option, which is
2043 common and against long-standing recommendation, and if at the
2044 moment ntpd is restarted an attacker can immediately respond to
2045 enough requests from enough sources trusted by the target, which
2046 is difficult and not common, there is a window of opportunity
2047 where the attacker can cause ntpd to set the time to an
2048 arbitrary value. Similarly, if an attacker is able to respond
2049 to enough requests from enough sources trusted by the target,
2050 the attacker can cause ntpd to abort and restart, at which
2051 point it can tell the target to set the time to an arbitrary
2052 value if and only if ntpd was re-started against long-standing
2053 recommendation with the -g flag, or if ntpd was not given the
2054 -g flag, the attacker can move the target system's time by at
2055 most 900 seconds' time per attack.
2057 Configure ntpd to get time from multiple sources.
2058 Upgrade to 4.2.8p5, or later, from the NTP Project Download
2059 Page or the NTP Public Services Project Download Page
2060 As we've long documented, only use the -g option to ntpd in
2061 cold-start situations.
2062 Monitor your ntpd instances.
2063 Credit: This weakness was discovered by Aanchal Malhotra,
2064 Isaac E. Cohen, and Sharon Goldberg at Boston University.
2066 NOTE WELL: The -g flag disables the limit check on the panic_gate
2067 in ntpd, which is 900 seconds by default. The bug identified by
2068 the researchers at Boston University is that the panic_gate
2069 check was only re-enabled after the first change to the system
2070 clock that was greater than 128 milliseconds, by default. The
2071 correct behavior is that the panic_gate check should be
2072 re-enabled after any initial time correction.
2074 If an attacker is able to inject consistent but erroneous time
2075 responses to your systems via the network or "over the air",
2076 perhaps by spoofing radio, cellphone, or navigation satellite
2077 transmissions, they are in a great position to affect your
2078 system's clock. There comes a point where your very best
2081 Configure ntpd to get time from multiple sources.
2082 Monitor your ntpd instances.
2086 * Coverity submission process updated from Coverity 5 to Coverity 7.
2087 The NTP codebase has been undergoing regular Coverity scans on an
2088 ongoing basis since 2006. As part of our recent upgrade from
2089 Coverity 5 to Coverity 7, Coverity identified 16 nits in some of
2090 the newly-written Unity test programs. These were fixed.
2091 * [Bug 2829] Clean up pipe_fds in ntpd.c perlinger@ntp.org
2092 * [Bug 2887] stratum -1 config results as showing value 99
2093 - fudge stratum should only accept values [0..16]. perlinger@ntp.org
2094 * [Bug 2932] Update leapsecond file info in miscopt.html. CWoodbury, HStenn.
2095 * [Bug 2934] tests/ntpd/t-ntp_scanner.c has a magic constant wired in. HMurray
2096 * [Bug 2944] errno is not preserved properly in ntpdate after sendto call.
2097 - applied patch by Christos Zoulas. perlinger@ntp.org
2098 * [Bug 2952] Peer associations broken by fix for Bug 2901/CVE-2015-7704.
2099 * [Bug 2954] Version 4.2.8p4 crashes on startup on some OSes.
2100 - fixed data race conditions in threaded DNS worker. perlinger@ntp.org
2101 - limit threading warm-up to linux; FreeBSD bombs on it. perlinger@ntp.org
2102 * [Bug 2957] 'unsigned int' vs 'size_t' format clash. perlinger@ntp.org
2103 - accept key file only if there are no parsing errors
2104 - fixed size_t/u_int format clash
2105 - fixed wrong use of 'strlcpy'
2106 * [Bug 2958] ntpq: fatal error messages need a final newline. Craig Leres.
2107 * [Bug 2962] truncation of size_t/ptrdiff_t on 64bit targets. perlinger@ntp.org
2108 - fixed several other warnings (cast-alignment, missing const, missing prototypes)
2109 - promote use of 'size_t' for values that express a size
2110 - use ptr-to-const for read-only arguments
2111 - make sure SOCKET values are not truncated (win32-specific)
2112 - format string fixes
2113 * [Bug 2965] Local clock didn't work since 4.2.8p4. Martin Burnicki.
2114 * [Bug 2967] ntpdate command suffers an assertion failure
2115 - fixed ntp_rfc2553.c to return proper address length. perlinger@ntp.org
2116 * [Bug 2969] Seg fault from ntpq/mrulist when looking at server with
2117 lots of clients. perlinger@ntp.org
2118 * [Bug 2971] ntpq bails on ^C: select fails: Interrupted system call
2119 - changed stacked/nested handling of CTRL-C. perlinger@ntp.org
2120 * Unity cleanup for FreeBSD-6.4. Harlan Stenn.
2121 * Unity test cleanup. Harlan Stenn.
2122 * Libevent autoconf pthread fixes for FreeBSD-10. Harlan Stenn.
2123 * Header cleanup in tests/sandbox/uglydate.c. Harlan Stenn.
2124 * Header cleanup in tests/libntp/sfptostr.c. Harlan Stenn.
2125 * Quiet a warning from clang. Harlan Stenn.
2128 NTP 4.2.8p4 (Harlan Stenn <stenn@ntp.org>, 2015/10/21)
2130 Focus: Security, Bug fixes, enhancements.
2134 In addition to bug fixes and enhancements, this release fixes the
2135 following 13 low- and medium-severity vulnerabilities:
2137 * Incomplete vallen (value length) checks in ntp_crypto.c, leading
2138 to potential crashes or potential code injection/information leakage.
2140 References: Sec 2899, Sec 2671, CVE-2015-7691, CVE-2015-7692, CVE-2015-7702
2141 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2142 and 4.3.0 up to, but not including 4.3.77
2143 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 4.6
2144 Summary: The fix for CVE-2014-9750 was incomplete in that there were
2145 certain code paths where a packet with particular autokey operations
2146 that contained malicious data was not always being completely
2147 validated. Receipt of these packets can cause ntpd to crash.
2150 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2151 Page or the NTP Public Services Project Download Page
2152 Monitor your ntpd instances.
2153 Credit: This weakness was discovered by Tenable Network Security.
2155 * Clients that receive a KoD should validate the origin timestamp field.
2157 References: Sec 2901 / CVE-2015-7704, CVE-2015-7705
2158 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2159 and 4.3.0 up to, but not including 4.3.77
2160 CVSS: (AV:N/AC:M/Au:N/C:N/I:N/A:P) Base Score: 4.3-5.0 at worst
2161 Summary: An ntpd client that honors Kiss-of-Death responses will honor
2162 KoD messages that have been forged by an attacker, causing it to
2163 delay or stop querying its servers for time updates. Also, an
2164 attacker can forge packets that claim to be from the target and
2165 send them to servers often enough that a server that implements
2166 KoD rate limiting will send the target machine a KoD response to
2167 attempt to reduce the rate of incoming packets, or it may also
2168 trigger a firewall block at the server for packets from the target
2169 machine. For either of these attacks to succeed, the attacker must
2170 know what servers the target is communicating with. An attacker
2171 can be anywhere on the Internet and can frequently learn the
2172 identity of the target's time source by sending the target a
2176 Upgrade to 4.2.8p4, or later, from the NTP Project Download Page
2177 or the NTP Public Services Project Download Page
2178 If you can't upgrade, restrict who can query ntpd to learn who
2179 its servers are, and what IPs are allowed to ask your system
2180 for the time. This mitigation is heavy-handed.
2181 Monitor your ntpd instances.
2183 4.2.8p4 protects against the first attack. For the second attack,
2184 all we can do is warn when it is happening, which we do in 4.2.8p4.
2185 Credit: This weakness was discovered by Aanchal Malhotra,
2186 Issac E. Cohen, and Sharon Goldberg of Boston University.
2188 * configuration directives to change "pidfile" and "driftfile" should
2189 only be allowed locally.
2191 References: Sec 2902 / CVE-2015-5196
2192 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2193 and 4.3.0 up to, but not including 4.3.77
2194 CVSS: (AV:N/AC:H/Au:M/C:N/I:C/A:C) Base Score: 6.2 worst case
2195 Summary: If ntpd is configured to allow for remote configuration,
2196 and if the (possibly spoofed) source IP address is allowed to
2197 send remote configuration requests, and if the attacker knows
2198 the remote configuration password, it's possible for an attacker
2199 to use the "pidfile" or "driftfile" directives to potentially
2200 overwrite other files.
2203 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2204 Page or the NTP Public Services Project Download Page
2205 If you cannot upgrade, don't enable remote configuration.
2206 If you must enable remote configuration and cannot upgrade,
2207 remote configuration of NTF's ntpd requires:
2208 - an explicitly configured trustedkey, and you should also
2209 configure a controlkey.
2210 - access from a permitted IP. You choose the IPs.
2211 - authentication. Don't disable it. Practice secure key safety.
2212 Monitor your ntpd instances.
2213 Credit: This weakness was discovered by Miroslav Lichvar of Red Hat.
2215 * Slow memory leak in CRYPTO_ASSOC
2217 References: Sec 2909 / CVE-2015-7701
2218 Affects: All ntp-4 releases that use autokey up to, but not
2219 including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
2220 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 0.0 best/usual case,
2222 Summary: If ntpd is configured to use autokey, then an attacker can
2223 send packets to ntpd that will, after several days of ongoing
2224 attack, cause it to run out of memory.
2227 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2228 Page or the NTP Public Services Project Download Page
2229 Monitor your ntpd instances.
2230 Credit: This weakness was discovered by Tenable Network Security.
2232 * mode 7 loop counter underrun
2234 References: Sec 2913 / CVE-2015-7848 / TALOS-CAN-0052
2235 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2236 and 4.3.0 up to, but not including 4.3.77
2237 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 4.6
2238 Summary: If ntpd is configured to enable mode 7 packets, and if the
2239 use of mode 7 packets is not properly protected thru the use of
2240 the available mode 7 authentication and restriction mechanisms,
2241 and if the (possibly spoofed) source IP address is allowed to
2242 send mode 7 queries, then an attacker can send a crafted packet
2243 to ntpd that will cause it to crash.
2246 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2247 Page or the NTP Public Services Project Download Page.
2248 If you are unable to upgrade:
2249 In ntp-4.2.8, mode 7 is disabled by default. Don't enable it.
2250 If you must enable mode 7:
2251 configure the use of a requestkey to control who can issue
2253 configure restrict noquery to further limit mode 7 requests
2255 Monitor your ntpd instances.
2256 Credit: This weakness was discovered by Aleksandar Nikolic of Cisco Talos.
2258 * memory corruption in password store
2260 References: Sec 2916 / CVE-2015-7849 / TALOS-CAN-0054
2261 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
2262 CVSS: (AV:N/AC:H/Au:M/C:N/I:C/A:C) Base Score: 6.8, worst case
2263 Summary: If ntpd is configured to allow remote configuration, and if
2264 the (possibly spoofed) source IP address is allowed to send
2265 remote configuration requests, and if the attacker knows the
2266 remote configuration password or if ntpd was configured to
2267 disable authentication, then an attacker can send a set of
2268 packets to ntpd that may cause a crash or theoretically
2269 perform a code injection attack.
2272 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2273 Page or the NTP Public Services Project Download Page.
2274 If you are unable to upgrade, remote configuration of NTF's
2276 an explicitly configured "trusted" key. Only configure
2277 this if you need it.
2278 access from a permitted IP address. You choose the IPs.
2279 authentication. Don't disable it. Practice secure key safety.
2280 Monitor your ntpd instances.
2281 Credit: This weakness was discovered by Yves Younan of Cisco Talos.
2283 * Infinite loop if extended logging enabled and the logfile and
2284 keyfile are the same.
2286 References: Sec 2917 / CVE-2015-7850 / TALOS-CAN-0055
2287 Affects: All ntp-4 releases up to, but not including 4.2.8p4,
2288 and 4.3.0 up to, but not including 4.3.77
2289 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 4.6, worst case
2290 Summary: If ntpd is configured to allow remote configuration, and if
2291 the (possibly spoofed) source IP address is allowed to send
2292 remote configuration requests, and if the attacker knows the
2293 remote configuration password or if ntpd was configured to
2294 disable authentication, then an attacker can send a set of
2295 packets to ntpd that will cause it to crash and/or create a
2296 potentially huge log file. Specifically, the attacker could
2297 enable extended logging, point the key file at the log file,
2298 and cause what amounts to an infinite loop.
2301 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2302 Page or the NTP Public Services Project Download Page.
2303 If you are unable to upgrade, remote configuration of NTF's ntpd
2305 an explicitly configured "trusted" key. Only configure this
2307 access from a permitted IP address. You choose the IPs.
2308 authentication. Don't disable it. Practice secure key safety.
2309 Monitor your ntpd instances.
2310 Credit: This weakness was discovered by Yves Younan of Cisco Talos.
2312 * Potential path traversal vulnerability in the config file saving of
2315 References: Sec 2918 / CVE-2015-7851 / TALOS-CAN-0062
2316 Affects: All ntp-4 releases running under VMS up to, but not
2317 including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
2318 CVSS: (AV:N/AC:H/Au:M/C:N/I:P/A:C) Base Score: 5.2, worst case
2319 Summary: If ntpd is configured to allow remote configuration, and if
2320 the (possibly spoofed) IP address is allowed to send remote
2321 configuration requests, and if the attacker knows the remote
2322 configuration password or if ntpd was configured to disable
2323 authentication, then an attacker can send a set of packets to
2324 ntpd that may cause ntpd to overwrite files.
2327 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2328 Page or the NTP Public Services Project Download Page.
2329 If you are unable to upgrade, remote configuration of NTF's ntpd
2331 an explicitly configured "trusted" key. Only configure
2332 this if you need it.
2333 access from permitted IP addresses. You choose the IPs.
2334 authentication. Don't disable it. Practice key security safety.
2335 Monitor your ntpd instances.
2336 Credit: This weakness was discovered by Yves Younan of Cisco Talos.
2338 * ntpq atoascii() potential memory corruption
2340 References: Sec 2919 / CVE-2015-7852 / TALOS-CAN-0063
2341 Affects: All ntp-4 releases running up to, but not including 4.2.8p4,
2342 and 4.3.0 up to, but not including 4.3.77
2343 CVSS: (AV:N/AC:H/Au:N/C:N/I:P/A:P) Base Score: 4.0, worst case
2344 Summary: If an attacker can figure out the precise moment that ntpq
2345 is listening for data and the port number it is listening on or
2346 if the attacker can provide a malicious instance ntpd that
2347 victims will connect to then an attacker can send a set of
2348 crafted mode 6 response packets that, if received by ntpq,
2349 can cause ntpq to crash.
2352 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2353 Page or the NTP Public Services Project Download Page.
2354 If you are unable to upgrade and you run ntpq against a server
2355 and ntpq crashes, try again using raw mode. Build or get a
2356 patched ntpq and see if that fixes the problem. Report new
2357 bugs in ntpq or abusive servers appropriately.
2358 If you use ntpq in scripts, make sure ntpq does what you expect
2360 Credit: This weakness was discovered by Yves Younan and
2361 Aleksander Nikolich of Cisco Talos.
2363 * Invalid length data provided by a custom refclock driver could cause
2366 References: Sec 2920 / CVE-2015-7853 / TALOS-CAN-0064
2367 Affects: Potentially all ntp-4 releases running up to, but not
2368 including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
2369 that have custom refclocks
2370 CVSS: (AV:L/AC:H/Au:M/C:C/I:C/A:C) Base Score: 0.0 usual case,
2371 5.9 unusual worst case
2372 Summary: A negative value for the datalen parameter will overflow a
2373 data buffer. NTF's ntpd driver implementations always set this
2374 value to 0 and are therefore not vulnerable to this weakness.
2375 If you are running a custom refclock driver in ntpd and that
2376 driver supplies a negative value for datalen (no custom driver
2377 of even minimal competence would do this) then ntpd would
2378 overflow a data buffer. It is even hypothetically possible
2379 in this case that instead of simply crashing ntpd the attacker
2380 could effect a code injection attack.
2382 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2383 Page or the NTP Public Services Project Download Page.
2384 If you are unable to upgrade:
2385 If you are running custom refclock drivers, make sure
2386 the signed datalen value is either zero or positive.
2387 Monitor your ntpd instances.
2388 Credit: This weakness was discovered by Yves Younan of Cisco Talos.
2390 * Password Length Memory Corruption Vulnerability
2392 References: Sec 2921 / CVE-2015-7854 / TALOS-CAN-0065
2393 Affects: All ntp-4 releases up to, but not including 4.2.8p4, and
2394 4.3.0 up to, but not including 4.3.77
2395 CVSS: (AV:N/AC:H/Au:M/C:C/I:C/A:C) Base Score: 0.0 best case,
2396 1.7 usual case, 6.8, worst case
2397 Summary: If ntpd is configured to allow remote configuration, and if
2398 the (possibly spoofed) source IP address is allowed to send
2399 remote configuration requests, and if the attacker knows the
2400 remote configuration password or if ntpd was (foolishly)
2401 configured to disable authentication, then an attacker can
2402 send a set of packets to ntpd that may cause it to crash,
2403 with the hypothetical possibility of a small code injection.
2406 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2407 Page or the NTP Public Services Project Download Page.
2408 If you are unable to upgrade, remote configuration of NTF's
2410 an explicitly configured "trusted" key. Only configure
2411 this if you need it.
2412 access from a permitted IP address. You choose the IPs.
2413 authentication. Don't disable it. Practice secure key safety.
2414 Monitor your ntpd instances.
2415 Credit: This weakness was discovered by Yves Younan and
2416 Aleksander Nikolich of Cisco Talos.
2418 * decodenetnum() will ASSERT botch instead of returning FAIL on some
2421 References: Sec 2922 / CVE-2015-7855
2422 Affects: All ntp-4 releases up to, but not including 4.2.8p4, and
2423 4.3.0 up to, but not including 4.3.77
2424 CVSS: (AV:N/AC:H/Au:M/C:N/I:N/A:C) Base Score: 4.6, worst case
2425 Summary: If ntpd is fed a crafted mode 6 or mode 7 packet containing
2426 an unusually long data value where a network address is expected,
2427 the decodenetnum() function will abort with an assertion failure
2428 instead of simply returning a failure condition.
2431 Upgrade to 4.2.8p4, or later, from the NTP Project Download
2432 Page or the NTP Public Services Project Download Page.
2433 If you are unable to upgrade:
2434 mode 7 is disabled by default. Don't enable it.
2435 Use restrict noquery to limit who can send mode 6
2436 and mode 7 requests.
2437 Configure and use the controlkey and requestkey
2438 authentication directives to limit who can
2439 send mode 6 and mode 7 requests.
2440 Monitor your ntpd instances.
2441 Credit: This weakness was discovered by John D "Doug" Birdwell of IDA.org.
2443 * NAK to the Future: Symmetric association authentication bypass via
2446 References: Sec 2941 / CVE-2015-7871
2447 Affects: All ntp-4 releases between 4.2.5p186 up to but not including
2448 4.2.8p4, and 4.3.0 up to but not including 4.3.77
2449 CVSS: (AV:N/AC:L/Au:N/C:N/I:P/A:P) Base Score: 6.4
2450 Summary: Crypto-NAK packets can be used to cause ntpd to accept time
2451 from unauthenticated ephemeral symmetric peers by bypassing the
2452 authentication required to mobilize peer associations. This
2453 vulnerability appears to have been introduced in ntp-4.2.5p186
2454 when the code handling mobilization of new passive symmetric
2455 associations (lines 1103-1165) was refactored.
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:
2461 Apply the patch to the bottom of the "authentic" check
2462 block around line 1136 of ntp_proto.c.
2463 Monitor your ntpd instances.
2464 Credit: This weakness was discovered by Matthew Van Gundy of Cisco ASIG.
2466 Backward-Incompatible changes:
2467 * [Bug 2817] Default on Linux is now "rlimit memlock -1".
2468 While the general default of 32M is still the case, under Linux
2469 the default value has been changed to -1 (do not lock ntpd into
2470 memory). A value of 0 means "lock ntpd into memory with whatever
2471 memory it needs." If your ntp.conf file has an explicit "rlimit memlock"
2472 value in it, that value will continue to be used.
2474 * [Bug 2886] Misspelling: "outlyer" should be "outlier".
2475 If you've written a script that looks for this case in, say, the
2476 output of ntpq, you probably want to change your regex matches
2477 from 'outlyer' to 'outl[iy]er'.
2479 New features in this release:
2480 * 'rlimit memlock' now has finer-grained control. A value of -1 means
2481 "don't lock ntpd into memore". This is the default for Linux boxes.
2482 A value of 0 means "lock ntpd into memory" with no limits. Otherwise
2483 the value is the number of megabytes of memory to lock. The default
2486 * The old Google Test framework has been replaced with a new framework,
2487 based on http://www.throwtheswitch.org/unity/ .
2489 Bug Fixes and Improvements:
2490 * [Bug 2332] (reopened) Exercise thread cancellation once before dropping
2491 privileges and limiting resources in NTPD removes the need to link
2492 forcefully against 'libgcc_s' which does not always work. J.Perlinger
2493 * [Bug 2595] ntpdate man page quirks. Hal Murray, Harlan Stenn.
2494 * [Bug 2625] Deprecate flag1 in local refclock. Hal Murray, Harlan Stenn.
2495 * [Bug 2817] Stop locking ntpd into memory by default under Linux. H.Stenn.
2496 * [Bug 2821] minor build issues: fixed refclock_gpsdjson.c. perlinger@ntp.org
2497 * [Bug 2823] ntpsweep with recursive peers option doesn't work. H.Stenn.
2498 * [Bug 2849] Systems with more than one default route may never
2499 synchronize. Brian Utterback. Note that this patch might need to
2500 be reverted once Bug 2043 has been fixed.
2501 * [Bug 2864] 4.2.8p3 fails to compile on Windows. Juergen Perlinger
2502 * [Bug 2866] segmentation fault at initgroups(). Harlan Stenn.
2503 * [Bug 2867] ntpd with autokey active crashed by 'ntpq -crv'. J.Perlinger
2504 * [Bug 2873] libevent should not include .deps/ in the tarball. H.Stenn
2505 * [Bug 2874] Don't distribute generated sntp/tests/fileHandlingTest.h. H.Stenn
2506 * [Bug 2875] sntp/Makefile.am: Get rid of DIST_SUBDIRS. libevent must
2507 be configured for the distribution targets. Harlan Stenn.
2508 * [Bug 2883] ntpd crashes on exit with empty driftfile. Miroslav Lichvar.
2509 * [Bug 2886] Mis-spelling: "outlyer" should be "outlier". dave@horsfall.org
2510 * [Bug 2888] streamline calendar functions. perlinger@ntp.org
2511 * [Bug 2889] ntp-dev-4.3.67 does not build on Windows. perlinger@ntp.org
2512 * [Bug 2890] Ignore ENOBUFS on routing netlink socket. Konstantin Khlebnikov.
2513 * [Bug 2906] make check needs better support for pthreads. Harlan Stenn.
2514 * [Bug 2907] dist* build targets require our libevent/ to be enabled. HStenn.
2515 * [Bug 2912] no munlockall() under Windows. David Taylor, Harlan Stenn.
2516 * libntp/emalloc.c: Remove explicit include of stdint.h. Harlan Stenn.
2517 * Put Unity CPPFLAGS items in unity_config.h. Harlan Stenn.
2518 * tests/ntpd/g_leapsec.cpp typo fix. Harlan Stenn.
2519 * Phase 1 deprecation of google test in sntp/tests/. Harlan Stenn.
2520 * On some versions of HP-UX, inttypes.h does not include stdint.h. H.Stenn.
2521 * top_srcdir can change based on ntp v. sntp. Harlan Stenn.
2522 * sntp/tests/ function parameter list cleanup. Damir Tomić.
2523 * tests/libntp/ function parameter list cleanup. Damir Tomić.
2524 * tests/ntpd/ function parameter list cleanup. Damir Tomić.
2525 * sntp/unity/unity_config.h: handle stdint.h. Harlan Stenn.
2526 * sntp/unity/unity_internals.h: handle *INTPTR_MAX on old Solaris. H.Stenn.
2527 * tests/libntp/timevalops.c and timespecops.c fixed error printing. D.Tomić.
2528 * tests/libntp/ improvements in code and fixed error printing. Damir Tomić.
2529 * tests/libntp: a_md5encrypt.c, authkeys.c, buftvtots.c, calendar.c, caljulian.c,
2530 caltontp.c, clocktime.c, humandate.c, hextolfp.c, decodenetnum.c - fixed
2531 formatting; first declaration, then code (C90); deleted unnecessary comments;
2532 changed from sprintf to snprintf; fixed order of includes. Tomasz Flendrich
2533 * tests/libntp/lfpfunc.c remove unnecessary include, remove old comments,
2534 fix formatting, cleanup. Tomasz Flendrich
2535 * tests/libntp/lfptostr.c remove unnecessary include, add consts, fix formatting.
2537 * tests/libntp/statestr.c remove empty functions, remove unnecessary include,
2538 fix formatting. Tomasz Flendrich
2539 * tests/libntp/modetoa.c fixed formatting. Tomasz Flendrich
2540 * tests/libntp/msyslog.c fixed formatting. Tomasz Flendrich
2541 * tests/libntp/numtoa.c deleted unnecessary empty functions, fixed formatting.
2543 * tests/libntp/numtohost.c added const, fixed formatting. Tomasz Flendrich
2544 * tests/libntp/refnumtoa.c fixed formatting. Tomasz Flendrich
2545 * tests/libntp/ssl_init.c fixed formatting. Tomasz Flendrich
2546 * tests/libntp/tvtots.c fixed a bug, fixed formatting. Tomasz Flendrich
2547 * tests/libntp/uglydate.c removed an unnecessary include. Tomasz Flendrich
2548 * tests/libntp/vi64ops.c removed an unnecessary comment, fixed formatting.
2549 * tests/libntp/ymd3yd.c removed an empty function and an unnecessary include,
2550 fixed formatting. Tomasz Flendrich
2551 * tests/libntp/timespecops.c fixed formatting, fixed the order of includes,
2552 removed unnecessary comments, cleanup. Tomasz Flendrich
2553 * tests/libntp/timevalops.c fixed the order of includes, deleted unnecessary
2554 comments, cleanup. Tomasz Flendrich
2555 * tests/libntp/sockaddrtest.h making it agree to NTP's conventions of formatting.
2557 * tests/libntp/lfptest.h cleanup. Tomasz Flendrich
2558 * tests/libntp/test-libntp.c fix formatting. Tomasz Flendrich
2559 * sntp/tests/crypto.c is now using proper Unity's assertions, fixed formatting.
2561 * sntp/tests/kodDatabase.c added consts, deleted empty function,
2562 fixed formatting. Tomasz Flendrich
2563 * sntp/tests/kodFile.c cleanup, fixed formatting. Tomasz Flendrich
2564 * sntp/tests/packetHandling.c is now using proper Unity's assertions,
2565 fixed formatting, deleted unused variable. Tomasz Flendrich
2566 * sntp/tests/keyFile.c is now using proper Unity's assertions, fixed formatting.
2568 * sntp/tests/packetProcessing.c changed from sprintf to snprintf,
2569 fixed formatting. Tomasz Flendrich
2570 * sntp/tests/utilities.c is now using proper Unity's assertions, changed
2571 the order of includes, fixed formatting, removed unnecessary comments.
2573 * sntp/tests/sntptest.h fixed formatting. Tomasz Flendrich
2574 * sntp/tests/fileHandlingTest.h.in fixed a possible buffer overflow problem,
2575 made one function do its job, deleted unnecessary prints, fixed formatting.
2577 * sntp/unity/Makefile.am added a missing header. Tomasz Flendrich
2578 * sntp/unity/unity_config.h: Distribute it. Harlan Stenn.
2579 * sntp/libevent/evconfig-private.h: remove generated filefrom SCM. H.Stenn.
2580 * sntp/unity/Makefile.am: fix some broken paths. Harlan Stenn.
2581 * sntp/unity/unity.c: Clean up a printf(). Harlan Stenn.
2582 * Phase 1 deprecation of google test in tests/libntp/. Harlan Stenn.
2583 * Don't build sntp/libevent/sample/. Harlan Stenn.
2584 * tests/libntp/test_caltontp needs -lpthread. Harlan Stenn.
2585 * br-flock: --enable-local-libevent. Harlan Stenn.
2586 * Wrote tests for ntpd/ntp_prio_q.c. Tomasz Flendrich
2587 * scripts/lib/NTP/Util.pm: stratum output is version-dependent. Harlan Stenn.
2588 * Get rid of the NTP_ prefix on our assertion macros. Harlan Stenn.
2589 * Code cleanup. Harlan Stenn.
2590 * libntp/icom.c: Typo fix. Harlan Stenn.
2591 * util/ntptime.c: initialization nit. Harlan Stenn.
2592 * ntpd/ntp_peer.c:newpeer(): added a DEBUG_REQUIRE(srcadr). Harlan Stenn.
2593 * Add std_unity_tests to various Makefile.am files. Harlan Stenn.
2594 * ntpd/ntp_restrict.c: added a few assertions, created tests for this file.
2596 * Changed progname to be const in many files - now it's consistent. Tomasz
2598 * Typo fix for GCC warning suppression. Harlan Stenn.
2599 * Added tests/ntpd/ntp_scanner.c test. Damir Tomić.
2600 * Added declarations to all Unity tests, and did minor fixes to them.
2601 Reduced the number of warnings by half. Damir Tomić.
2602 * Updated generate_test_runner.rb and updated the sntp/unity/auto directory
2603 with the latest Unity updates from Mark. Damir Tomić.
2604 * Retire google test - phase I. Harlan Stenn.
2605 * Unity test cleanup: move declaration of 'initializing'. Harlan Stenn.
2606 * Update the NEWS file. Harlan Stenn.
2607 * Autoconf cleanup. Harlan Stenn.
2608 * Unit test dist cleanup. Harlan Stenn.
2609 * Cleanup various test Makefile.am files. Harlan Stenn.
2610 * Pthread autoconf macro cleanup. Harlan Stenn.
2611 * Fix progname definition in unity runner scripts. Harlan Stenn.
2612 * Clean trailing whitespace in tests/ntpd/Makefile.am. Harlan Stenn.
2613 * Update the patch for bug 2817. Harlan Stenn.
2614 * More updates for bug 2817. Harlan Stenn.
2615 * Fix bugs in tests/ntpd/ntp_prio_q.c. Harlan Stenn.
2616 * gcc on older HPUX may need +allowdups. Harlan Stenn.
2617 * Adding missing MCAST protection. Harlan Stenn.
2618 * Disable certain test programs on certain platforms. Harlan Stenn.
2619 * Implement --enable-problem-tests (on by default). Harlan Stenn.
2620 * build system tweaks. Harlan Stenn.
2623 NTP 4.2.8p3 (Harlan Stenn <stenn@ntp.org>, 2015/06/29)
2625 Focus: 1 Security fix. Bug fixes and enhancements. Leap-second improvements.
2631 * [Sec 2853] Crafted remote config packet can crash some versions of
2632 ntpd. Aleksis Kauppinen, Juergen Perlinger, Harlan Stenn.
2634 Under specific circumstances an attacker can send a crafted packet to
2635 cause a vulnerable ntpd instance to crash. This requires each of the
2636 following to be true:
2638 1) ntpd set up to allow remote configuration (not allowed by default), and
2639 2) knowledge of the configuration password, and
2640 3) access to a computer entrusted to perform remote configuration.
2642 This vulnerability is considered low-risk.
2644 New features in this release:
2646 Optional (disabled by default) support to have ntpd provide smeared
2647 leap second time. A specially built and configured ntpd will only
2648 offer smeared time in response to client packets. These response
2649 packets will also contain a "refid" of 254.a.b.c, where the 24 bits
2650 of a, b, and c encode the amount of smear in a 2:22 integer:fraction
2651 format. See README.leapsmear and http://bugs.ntp.org/2855 for more
2654 *IF YOU CHOOSE TO CONFIGURE NTPD TO PROVIDE LEAP SMEAR TIME*
2655 *BE SURE YOU DO NOT OFFER THAT TIME ON PUBLIC TIMESERVERS.*
2657 We've imported the Unity test framework, and have begun converting
2658 the existing google-test items to this new framework. If you want
2659 to write new tests or change old ones, you'll need to have ruby
2660 installed. You don't need ruby to run the test suite.
2662 Bug Fixes and Improvements:
2664 * CID 739725: Fix a rare resource leak in libevent/listener.c.
2665 * CID 1295478: Quiet a pedantic potential error from the fix for Bug 2776.
2666 * CID 1296235: Fix refclock_jjy.c and correcting type of the driver40-ja.html
2667 * CID 1269537: Clean up a line of dead code in getShmTime().
2668 * [Bug 1060] Buffer overruns in libparse/clk_rawdcf.c. Helge Oldach.
2669 * [Bug 2590] autogen-5.18.5.
2670 * [Bug 2612] restrict: Warn when 'monitor' can't be disabled because
2672 * [Bug 2650] fix includefile processing.
2673 * [Bug 2745] ntpd -x steps clock on leap second
2674 Fixed an initial-value problem that caused misbehaviour in absence of
2675 any leapsecond information.
2676 Do leap second stepping only of the step adjustment is beyond the
2677 proper jump distance limit and step correction is allowed at all.
2678 * [Bug 2750] build for Win64
2679 Building for 32bit of loopback ppsapi needs def file
2680 * [Bug 2776] Improve ntpq's 'help keytype'.
2681 * [Bug 2778] Implement "apeers" ntpq command to include associd.
2682 * [Bug 2782] Refactor refclock_shm.c, add memory barrier protection.
2683 * [Bug 2792] If the IFF_RUNNING interface flag is supported then an
2684 interface is ignored as long as this flag is not set since the
2685 interface is not usable (e.g., no link).
2686 * [Bug 2794] Clean up kernel clock status reports.
2687 * [Bug 2800] refclock_true.c true_debug() can't open debug log because
2688 of incompatible open/fdopen parameters.
2689 * [Bug 2804] install-local-data assumes GNU 'find' semantics.
2690 * [Bug 2805] ntpd fails to join multicast group.
2691 * [Bug 2806] refclock_jjy.c supports the Telephone JJY.
2692 * [Bug 2808] GPSD_JSON driver enhancements, step 1.
2693 Fix crash during cleanup if GPS device not present and char device.
2694 Increase internal token buffer to parse all JSON data, even SKY.
2695 Defer logging of errors during driver init until the first unit is
2696 started, so the syslog is not cluttered when the driver is not used.
2697 Various improvements, see http://bugs.ntp.org/2808 for details.
2698 Changed libjsmn to a more recent version.
2699 * [Bug 2810] refclock_shm.c memory barrier code needs tweaks for QNX.
2700 * [Bug 2813] HP-UX needs -D__STDC_VERSION__=199901L and limits.h.
2701 * [Bug 2815] net-snmp before v5.4 has circular library dependencies.
2702 * [Bug 2821] Add a missing NTP_PRINTF and a missing const.
2703 * [Bug 2822] New leap column in sntp broke NTP::Util.pm.
2704 * [Bug 2824] Convert update-leap to perl. (also see 2769)
2705 * [Bug 2825] Quiet file installation in html/ .
2706 * [Bug 2830] ntpd doesn't always transfer the correct TAI offset via autokey
2707 NTPD transfers the current TAI (instead of an announcement) now.
2708 This might still needed improvement.
2709 Update autokey data ASAP when 'sys_tai' changes.
2710 Fix unit test that was broken by changes for autokey update.
2711 Avoid potential signature length issue and use DPRINTF where possible
2713 * [Bug 2832] refclock_jjy.c supports the TDC-300.
2714 * [Bug 2834] Correct a broken html tag in html/refclock.html
2715 * [Bug 2836] DFC77 patches from Frank Kardel to make decoding more
2716 robust, and require 2 consecutive timestamps to be consistent.
2717 * [Bug 2837] Allow a configurable DSCP value.
2718 * [Bug 2837] add test for DSCP to ntpd/complete.conf.in
2719 * [Bug 2842] Glitch in ntp.conf.def documentation stanza.
2720 * [Bug 2842] Bug in mdoc2man.
2721 * [Bug 2843] make check fails on 4.3.36
2722 Fixed compiler warnings about numeric range overflow
2723 (The original topic was fixed in a byplay to bug#2830)
2724 * [Bug 2845] Harden memory allocation in ntpd.
2725 * [Bug 2852] 'make check' can't find unity.h. Hal Murray.
2726 * [Bug 2854] Missing brace in libntp/strdup.c. Masanari Iida.
2727 * [Bug 2855] Parser fix for conditional leap smear code. Harlan Stenn.
2728 * [Bug 2855] Report leap smear in the REFID. Harlan Stenn.
2729 * [Bug 2855] Implement conditional leap smear code. Martin Burnicki.
2730 * [Bug 2856] ntpd should wait() on terminated child processes. Paul Green.
2731 * [Bug 2857] Stratus VOS does not support SIGIO. Paul Green.
2732 * [Bug 2859] Improve raw DCF77 robustness deconding. Frank Kardel.
2733 * [Bug 2860] ntpq ifstats sanity check is too stringent. Frank Kardel.
2734 * html/drivers/driver22.html: typo fix. Harlan Stenn.
2735 * refidsmear test cleanup. Tomasz Flendrich.
2736 * refidsmear function support and tests. Harlan Stenn.
2737 * sntp/tests/Makefile.am: remove g_nameresolution.cpp as it tested
2738 something that was only in the 4.2.6 sntp. Harlan Stenn.
2739 * Modified tests/bug-2803/Makefile.am so it builds Unity framework tests.
2741 * Modified tests/libtnp/Makefile.am so it builds Unity framework tests.
2743 * Modified sntp/tests/Makefile.am so it builds Unity framework tests.
2745 * tests/sandbox/smeartest.c: Harlan Stenn, Damir Tomic, Juergen Perlinger.
2746 * Converted from gtest to Unity: tests/bug-2803/. Damir Tomić
2747 * Converted from gtest to Unity: tests/libntp/ a_md5encrypt, atoint.c,
2748 atouint.c, authkeys.c, buftvtots.c, calendar.c, caljulian.c,
2749 calyearstart.c, clocktime.c, hextoint.c, lfpfunc.c, modetoa.c,
2750 numtoa.c, numtohost.c, refnumtoa.c, ssl_init.c, statestr.c,
2751 timespecops.c, timevalops.c, uglydate.c, vi64ops.c, ymd2yd.c.
2753 * Converted from gtest to Unity: sntp/tests/ kodDatabase.c, kodFile.c,
2754 networking.c, keyFile.c, utilities.cpp, sntptest.h,
2755 fileHandlingTest.h. Damir Tomić
2756 * Initial support for experimental leap smear code. Harlan Stenn.
2757 * Fixes to sntp/tests/fileHandlingTest.h.in. Harlan Stenn.
2758 * Report select() debug messages at debug level 3 now.
2759 * sntp/scripts/genLocInfo: treat raspbian as debian.
2760 * Unity test framework fixes.
2761 ** Requires ruby for changes to tests.
2762 * Initial support for PACKAGE_VERSION tests.
2763 * sntp/libpkgver belongs in EXTRA_DIST, not DIST_SUBDIRS.
2764 * tests/bug-2803/Makefile.am must distribute bug-2803.h.
2765 * Add an assert to the ntpq ifstats code.
2766 * Clean up the RLIMIT_STACK code.
2767 * Improve the ntpq documentation around the controlkey keyid.
2769 * Windows port build cleanup.
2772 NTP 4.2.8p2 (Harlan Stenn <stenn@ntp.org>, 2015/04/07)
2774 Focus: Security and Bug fixes, enhancements.
2778 In addition to bug fixes and enhancements, this release fixes the
2779 following medium-severity vulnerabilities involving private key
2782 * [Sec 2779] ntpd accepts unauthenticated packets with symmetric key crypto.
2784 References: Sec 2779 / CVE-2015-1798 / VU#374268
2785 Affects: All NTP4 releases starting with ntp-4.2.5p99 up to but not
2786 including ntp-4.2.8p2 where the installation uses symmetric keys
2787 to authenticate remote associations.
2788 CVSS: (AV:A/AC:M/Au:N/C:P/I:P/A:P) Base Score: 5.4
2789 Date Resolved: Stable (4.2.8p2) 07 Apr 2015
2790 Summary: When ntpd is configured to use a symmetric key to authenticate
2791 a remote NTP server/peer, it checks if the NTP message
2792 authentication code (MAC) in received packets is valid, but not if
2793 there actually is any MAC included. Packets without a MAC are
2794 accepted as if they had a valid MAC. This allows a MITM attacker to
2795 send false packets that are accepted by the client/peer without
2796 having to know the symmetric key. The attacker needs to know the
2797 transmit timestamp of the client to match it in the forged reply
2798 and the false reply needs to reach the client before the genuine
2799 reply from the server. The attacker doesn't necessarily need to be
2800 relaying the packets between the client and the server.
2802 Authentication using autokey doesn't have this problem as there is
2803 a check that requires the key ID to be larger than NTP_MAXKEY,
2804 which fails for packets without a MAC.
2806 Upgrade to 4.2.8p2, or later, from the NTP Project Download Page
2807 or the NTP Public Services Project Download Page
2808 Configure ntpd with enough time sources and monitor it properly.
2809 Credit: This issue was discovered by Miroslav Lichvar, of Red Hat.
2811 * [Sec 2781] Authentication doesn't protect symmetric associations against
2814 References: Sec 2781 / CVE-2015-1799 / VU#374268
2815 Affects: All NTP releases starting with at least xntp3.3wy up to but
2816 not including ntp-4.2.8p2 where the installation uses symmetric
2818 CVSS: (AV:A/AC:M/Au:N/C:P/I:P/A:P) Base Score: 5.4
2819 Note: the CVSS base Score for this issue could be 4.3 or lower, and
2820 it could be higher than 5.4.
2821 Date Resolved: Stable (4.2.8p2) 07 Apr 2015
2822 Summary: An attacker knowing that NTP hosts A and B are peering with
2823 each other (symmetric association) can send a packet to host A
2824 with source address of B which will set the NTP state variables
2825 on A to the values sent by the attacker. Host A will then send
2826 on its next poll to B a packet with originate timestamp that
2827 doesn't match the transmit timestamp of B and the packet will
2828 be dropped. If the attacker does this periodically for both
2829 hosts, they won't be able to synchronize to each other. This is
2830 a known denial-of-service attack, described at
2831 https://www.eecis.udel.edu/~mills/onwire.html .
2833 According to the document the NTP authentication is supposed to
2834 protect symmetric associations against this attack, but that
2835 doesn't seem to be the case. The state variables are updated even
2836 when authentication fails and the peers are sending packets with
2837 originate timestamps that don't match the transmit timestamps on
2840 This seems to be a very old problem, dating back to at least
2841 xntp3.3wy. It's also in the NTPv3 (RFC 1305) and NTPv4 (RFC 5905)
2842 specifications, so other NTP implementations with support for
2843 symmetric associations and authentication may be vulnerable too.
2844 An update to the NTP RFC to correct this error is in-process.
2846 Upgrade to 4.2.8p2, or later, from the NTP Project Download Page
2847 or the NTP Public Services Project Download Page
2848 Note that for users of autokey, this specific style of MITM attack
2849 is simply a long-known potential problem.
2850 Configure ntpd with appropriate time sources and monitor ntpd.
2851 Alert your staff if problems are detected.
2852 Credit: This issue was discovered by Miroslav Lichvar, of Red Hat.
2854 * New script: update-leap
2855 The update-leap script will verify and if necessary, update the
2856 leap-second definition file.
2857 It requires the following commands in order to work:
2859 wget logger tr sed shasum
2861 Some may choose to run this from cron. It needs more portability testing.
2863 Bug Fixes and Improvements:
2865 * [Bug 1787] DCF77's formerly "antenna" bit is "call bit" since 2003.
2866 * [Bug 1960] setsockopt IPV6_MULTICAST_IF: Invalid argument.
2867 * [Bug 2346] "graceful termination" signals do not do peer cleanup.
2868 * [Bug 2728] See if C99-style structure initialization works.
2869 * [Bug 2747] Upgrade libevent to 2.1.5-beta.
2870 * [Bug 2749] ntp/lib/NTP/Util.pm needs update for ntpq -w, IPv6, .POOL. .
2871 * [Bug 2751] jitter.h has stale copies of l_fp macros.
2872 * [Bug 2756] ntpd hangs in startup with gcc 3.3.5 on ARM.
2873 * [Bug 2757] Quiet compiler warnings.
2874 * [Bug 2759] Expose nonvolatile/clk_wander_threshold to ntpq.
2875 * [Bug 2763] Allow different thresholds for forward and backward steps.
2876 * [Bug 2766] ntp-keygen output files should not be world-readable.
2877 * [Bug 2767] ntp-keygen -M should symlink to ntp.keys.
2878 * [Bug 2771] nonvolatile value is documented in wrong units.
2879 * [Bug 2773] Early leap announcement from Palisade/Thunderbolt
2880 * [Bug 2774] Unreasonably verbose printout - leap pending/warning
2881 * [Bug 2775] ntp-keygen.c fails to compile under Windows.
2882 * [Bug 2777] Fixed loops and decoding of Meinberg GPS satellite info.
2883 Removed non-ASCII characters from some copyright comments.
2884 Removed trailing whitespace.
2885 Updated definitions for Meinberg clocks from current Meinberg header files.
2886 Now use C99 fixed-width types and avoid non-ASCII characters in comments.
2887 Account for updated definitions pulled from Meinberg header files.
2888 Updated comments on Meinberg GPS receivers which are not only called GPS16x.
2889 Replaced some constant numbers by defines from ntp_calendar.h
2890 Modified creation of parse-specific variables for Meinberg devices
2891 in gps16x_message().
2892 Reworked mk_utcinfo() to avoid printing of ambiguous leap second dates.
2893 Modified mbg_tm_str() which now expexts an additional parameter controlling
2894 if the time status shall be printed.
2895 * [Sec 2779] ntpd accepts unauthenticated packets with symmetric key crypto.
2896 * [Sec 2781] Authentication doesn't protect symmetric associations against
2898 * [Bug 2783] Quiet autoconf warnings about missing AC_LANG_SOURCE.
2899 * [Bug 2789] Quiet compiler warnings from libevent.
2900 * [Bug 2790] If ntpd sets the Windows MM timer highest resolution
2901 pause briefly before measuring system clock precision to yield
2903 * Comment from Juergen Perlinger in ntp_calendar.c to make the code clearer.
2904 * Use predefined function types for parse driver functions
2905 used to set up function pointers.
2906 Account for changed prototype of parse_inp_fnc_t functions.
2907 Cast parse conversion results to appropriate types to avoid
2909 Let ioctl() for Windows accept a (void *) to avoid compiler warnings
2910 when called with pointers to different types.
2913 NTP 4.2.8p1 (Harlan Stenn <stenn@ntp.org>, 2015/02/04)
2915 Focus: Security and Bug fixes, enhancements.
2919 In addition to bug fixes and enhancements, this release fixes the
2920 following high-severity vulnerabilities:
2922 * vallen is not validated in several places in ntp_crypto.c, leading
2923 to a potential information leak or possibly a crash
2925 References: Sec 2671 / CVE-2014-9297 / VU#852879
2926 Affects: All NTP4 releases before 4.2.8p1 that are running autokey.
2927 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
2928 Date Resolved: Stable (4.2.8p1) 04 Feb 2015
2929 Summary: The vallen packet value is not validated in several code
2930 paths in ntp_crypto.c which can lead to information leakage
2931 or perhaps a crash of the ntpd process.
2932 Mitigation - any of:
2933 Upgrade to 4.2.8p1, or later, from the NTP Project Download Page
2934 or the NTP Public Services Project Download Page.
2935 Disable Autokey Authentication by removing, or commenting out,
2936 all configuration directives beginning with the "crypto"
2937 keyword in your ntp.conf file.
2938 Credit: This vulnerability was discovered by Stephen Roettger of the
2939 Google Security Team, with additional cases found by Sebastian
2940 Krahmer of the SUSE Security Team and Harlan Stenn of Network
2943 * ::1 can be spoofed on some OSes, so ACLs based on IPv6 ::1 addresses
2946 References: Sec 2672 / CVE-2014-9298 / VU#852879
2947 Affects: All NTP4 releases before 4.2.8p1, under at least some
2948 versions of MacOS and Linux. *BSD has not been seen to be vulnerable.
2949 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:C) Base Score: 9
2950 Date Resolved: Stable (4.2.8p1) 04 Feb 2014
2951 Summary: While available kernels will prevent 127.0.0.1 addresses
2952 from "appearing" on non-localhost IPv4 interfaces, some kernels
2953 do not offer the same protection for ::1 source addresses on
2954 IPv6 interfaces. Since NTP's access control is based on source
2955 address and localhost addresses generally have no restrictions,
2956 an attacker can send malicious control and configuration packets
2957 by spoofing ::1 addresses from the outside. Note Well: This is
2958 not really a bug in NTP, it's a problem with some OSes. If you
2959 have one of these OSes where ::1 can be spoofed, ALL ::1 -based
2960 ACL restrictions on any application can be bypassed!
2962 Upgrade to 4.2.8p1, or later, from the NTP Project Download Page
2963 or the NTP Public Services Project Download Page
2964 Install firewall rules to block packets claiming to come from
2965 ::1 from inappropriate network interfaces.
2966 Credit: This vulnerability was discovered by Stephen Roettger of
2967 the Google Security Team.
2969 Additionally, over 30 bugfixes and improvements were made to the codebase.
2970 See the ChangeLog for more information.
2973 NTP 4.2.8 (Harlan Stenn <stenn@ntp.org>, 2014/12/18)
2975 Focus: Security and Bug fixes, enhancements.
2979 In addition to bug fixes and enhancements, this release fixes the
2980 following high-severity vulnerabilities:
2982 ************************** vv NOTE WELL vv *****************************
2984 The vulnerabilities listed below can be significantly mitigated by
2985 following the BCP of putting
2987 restrict default ... noquery
2989 in the ntp.conf file. With the exception of:
2991 receive(): missing return on error
2992 References: Sec 2670 / CVE-2014-9296 / VU#852879
2994 below (which is a limited-risk vulnerability), none of the recent
2995 vulnerabilities listed below can be exploited if the source IP is
2996 restricted from sending a 'query'-class packet by your ntp.conf file.
2998 ************************** ^^ NOTE WELL ^^ *****************************
3000 * Weak default key in config_auth().
3002 References: [Sec 2665] / CVE-2014-9293 / VU#852879
3003 CVSS: (AV:N/AC:L/Au:M/C:P/I:P/A:C) Base Score: 7.3
3004 Vulnerable Versions: all releases prior to 4.2.7p11
3005 Date Resolved: 28 Jan 2010
3007 Summary: If no 'auth' key is set in the configuration file, ntpd
3008 would generate a random key on the fly. There were two
3009 problems with this: 1) the generated key was 31 bits in size,
3010 and 2) it used the (now weak) ntp_random() function, which was
3011 seeded with a 32-bit value and could only provide 32 bits of
3012 entropy. This was sufficient back in the late 1990s when the
3013 code was written. Not today.
3015 Mitigation - any of:
3016 - Upgrade to 4.2.7p11 or later.
3017 - Follow BCP and put 'restrict ... noquery' in your ntp.conf file.
3019 Credit: This vulnerability was noticed in ntp-4.2.6 by Neel Mehta
3020 of the Google Security Team.
3022 * Non-cryptographic random number generator with weak seed used by
3023 ntp-keygen to generate symmetric keys.
3025 References: [Sec 2666] / CVE-2014-9294 / VU#852879
3026 CVSS: (AV:N/AC:L/Au:M/C:P/I:P/A:C) Base Score: 7.3
3027 Vulnerable Versions: All NTP4 releases before 4.2.7p230
3028 Date Resolved: Dev (4.2.7p230) 01 Nov 2011
3030 Summary: Prior to ntp-4.2.7p230 ntp-keygen used a weak seed to
3031 prepare a random number generator that was of good quality back
3032 in the late 1990s. The random numbers produced was then used to
3033 generate symmetric keys. In ntp-4.2.8 we use a current-technology
3034 cryptographic random number generator, either RAND_bytes from
3035 OpenSSL, or arc4random().
3037 Mitigation - any of:
3038 - Upgrade to 4.2.7p230 or later.
3039 - Follow BCP and put 'restrict ... noquery' in your ntp.conf file.
3041 Credit: This vulnerability was discovered in ntp-4.2.6 by
3042 Stephen Roettger of the Google Security Team.
3044 * Buffer overflow in crypto_recv()
3046 References: Sec 2667 / CVE-2014-9295 / VU#852879
3047 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
3048 Versions: All releases before 4.2.8
3049 Date Resolved: Stable (4.2.8) 18 Dec 2014
3051 Summary: When Autokey Authentication is enabled (i.e. the ntp.conf
3052 file contains a 'crypto pw ...' directive) a remote attacker
3053 can send a carefully crafted packet that can overflow a stack
3054 buffer and potentially allow malicious code to be executed
3055 with the privilege level of the ntpd process.
3057 Mitigation - any of:
3058 - Upgrade to 4.2.8, or later, or
3059 - Disable Autokey Authentication by removing, or commenting out,
3060 all configuration directives beginning with the crypto keyword
3061 in your ntp.conf file.
3063 Credit: This vulnerability was discovered by Stephen Roettger of the
3064 Google Security Team.
3066 * Buffer overflow in ctl_putdata()
3068 References: Sec 2668 / CVE-2014-9295 / VU#852879
3069 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
3070 Versions: All NTP4 releases before 4.2.8
3071 Date Resolved: Stable (4.2.8) 18 Dec 2014
3073 Summary: A remote attacker can send a carefully crafted packet that
3074 can overflow a stack buffer and potentially allow malicious
3075 code to be executed with the privilege level of the ntpd process.
3077 Mitigation - any of:
3078 - Upgrade to 4.2.8, or later.
3079 - Follow BCP and put 'restrict ... noquery' in your ntp.conf file.
3081 Credit: This vulnerability was discovered by Stephen Roettger of the
3082 Google Security Team.
3084 * Buffer overflow in configure()
3086 References: Sec 2669 / CVE-2014-9295 / VU#852879
3087 CVSS: (AV:N/AC:L/Au:N/C:P/I:P/A:P) Base Score: 7.5
3088 Versions: All NTP4 releases before 4.2.8
3089 Date Resolved: Stable (4.2.8) 18 Dec 2014
3091 Summary: A remote attacker can send a carefully crafted packet that
3092 can overflow a stack buffer and potentially allow malicious
3093 code to be executed with the privilege level of the ntpd process.
3095 Mitigation - any of:
3096 - Upgrade to 4.2.8, or later.
3097 - Follow BCP and put 'restrict ... noquery' in your ntp.conf file.
3099 Credit: This vulnerability was discovered by Stephen Roettger of the
3100 Google Security Team.
3102 * receive(): missing return on error
3104 References: Sec 2670 / CVE-2014-9296 / VU#852879
3105 CVSS: (AV:N/AC:L/Au:N/C:N/I:N/A:P) Base Score: 5.0
3106 Versions: All NTP4 releases before 4.2.8
3107 Date Resolved: Stable (4.2.8) 18 Dec 2014
3109 Summary: Code in ntp_proto.c:receive() was missing a 'return;' in
3110 the code path where an error was detected, which meant
3111 processing did not stop when a specific rare error occurred.
3112 We haven't found a way for this bug to affect system integrity.
3113 If there is no way to affect system integrity the base CVSS
3114 score for this bug is 0. If there is one avenue through which
3115 system integrity can be partially affected, the base score
3116 becomes a 5. If system integrity can be partially affected
3117 via all three integrity metrics, the CVSS base score become 7.5.
3119 Mitigation - any of:
3120 - Upgrade to 4.2.8, or later,
3121 - Remove or comment out all configuration directives
3122 beginning with the crypto keyword in your ntp.conf file.
3124 Credit: This vulnerability was discovered by Stephen Roettger of the
3125 Google Security Team.
3127 See http://support.ntp.org/security for more information.
3129 New features / changes in this release:
3133 * Internal NTP Era counters
3135 The internal counters that track the "era" (range of years) we are in
3136 rolls over every 136 years'. The current "era" started at the stroke of
3137 midnight on 1 Jan 1900, and ends just before the stroke of midnight on
3139 In the past, we have used the "midpoint" of the range to decide which
3140 era we were in. Given the longevity of some products, it became clear
3141 that it would be more functional to "look back" less, and "look forward"
3142 more. We now compile a timestamp into the ntpd executable and when we
3143 get a timestamp we us the "built-on" to tell us what era we are in.
3144 This check "looks back" 10 years, and "looks forward" 126 years.
3146 * ntpdc responses disabled by default
3150 For a long time, ntpq and its mostly text-based mode 6 (control)
3151 protocol have been preferred over ntpdc and its mode 7 (private
3152 request) protocol for runtime queries and configuration. There has
3153 been a goal of deprecating ntpdc, previously held back by numerous
3154 capabilities exposed by ntpdc with no ntpq equivalent. I have been
3155 adding commands to ntpq to cover these cases, and I believe I've
3156 covered them all, though I've not compared command-by-command
3159 As I've said previously, the binary mode 7 protocol involves a lot of
3160 hand-rolled structure layout and byte-swapping code in both ntpd and
3161 ntpdc which is hard to get right. As ntpd grows and changes, the
3162 changes are difficult to expose via ntpdc while maintaining forward
3163 and backward compatibility between ntpdc and ntpd. In contrast,
3164 ntpq's text-based, label=value approach involves more code reuse and
3165 allows compatible changes without extra work in most cases.
3167 Mode 7 has always been defined as vendor/implementation-specific while
3168 mode 6 is described in RFC 1305 and intended to be open to interoperate
3169 with other implementations. There is an early draft of an updated
3170 mode 6 description that likely will join the other NTPv4 RFCs
3171 eventually. (http://tools.ietf.org/html/draft-odonoghue-ntpv4-control-01)
3173 For these reasons, ntpd 4.2.7p230 by default disables processing of
3174 ntpdc queries, reducing ntpd's attack surface and functionally
3175 deprecating ntpdc. If you are in the habit of using ntpdc for certain
3176 operations, please try the ntpq equivalent. If there's no equivalent,
3177 please open a bug report at http://bugs.ntp.org./
3179 In addition to the above, over 1100 issues have been resolved between
3180 the 4.2.6 branch and 4.2.8. The ChangeLog file in the distribution
3184 NTP 4.2.6p5 (Harlan Stenn <stenn@ntp.org>, 2011/12/24)
3190 This is a recommended upgrade.
3192 This release updates sys_rootdisp and sys_jitter calculations to match the
3193 RFC specification, fixes a potential IPv6 address matching error for the
3194 "nic" and "interface" configuration directives, suppresses the creation of
3195 extraneous ephemeral associations for certain broadcastclient and
3196 multicastclient configurations, cleans up some ntpq display issues, and
3197 includes improvements to orphan mode, minor bugs fixes and code clean-ups.
3199 New features / changes in this release:
3203 * Updated "nic" and "interface" IPv6 address handling to prevent
3204 mismatches with localhost [::1] and wildcard [::] which resulted from
3205 using the address/prefix format (e.g. fe80::/64)
3206 * Fix orphan mode stratum incorrectly counting to infinity
3207 * Orphan parent selection metric updated to includes missing ntohl()
3208 * Non-printable stratum 16 refid no longer sent to ntp
3209 * Duplicate ephemeral associations suppressed for broadcastclient and
3210 multicastclient without broadcastdelay
3211 * Exclude undetermined sys_refid from use in loopback TEST12
3212 * Exclude MODE_SERVER responses from KoD rate limiting
3213 * Include root delay in clock_update() sys_rootdisp calculations
3214 * get_systime() updated to exclude sys_residual offset (which only
3215 affected bits "below" sys_tick, the precision threshold)
3216 * sys.peer jitter weighting corrected in sys_jitter calculation
3220 * -n option extended to include the billboard "server" column
3221 * IPv6 addresses in the local column truncated to prevent overruns
3224 NTP 4.2.6p4 (Harlan Stenn <stenn@ntp.org>, 2011/09/22)
3226 Focus: Bug fixes and portability improvements
3230 This is a recommended upgrade.
3232 This release includes build infrastructure updates, code
3233 clean-ups, minor bug fixes, fixes for a number of minor
3234 ref-clock issues, and documentation revisions.
3236 Portability improvements affect AIX, HP-UX, Linux, OS X and 64-bit time_t.
3238 New features / changes in this release:
3242 * Fix checking for struct rtattr
3243 * Update config.guess and config.sub for AIX
3244 * Upgrade required version of autogen and libopts for building
3245 from our source code repository
3249 * Back-ported several fixes for Coverity warnings from ntp-dev
3250 * Fix a rare boundary condition in UNLINK_EXPR_SLIST()
3251 * Allow "logconfig =allall" configuration directive
3252 * Bind tentative IPv6 addresses on Linux
3253 * Correct WWVB/Spectracom driver to timestamp CR instead of LF
3254 * Improved tally bit handling to prevent incorrect ntpq peer status reports
3255 * Exclude the Undisciplined Local Clock and ACTS drivers from the initial
3256 candidate list unless they are designated a "prefer peer"
3257 * Prevent the consideration of Undisciplined Local Clock or ACTS drivers for
3258 selection during the 'tos orphanwait' period
3259 * Prefer an Orphan Mode Parent over the Undisciplined Local Clock or ACTS
3261 * Improved support of the Parse Refclock trusttime flag in Meinberg mode
3262 * Back-port utility routines from ntp-dev: mprintf(), emalloc_zero()
3263 * Added the NTPD_TICKADJ_PPM environment variable for specifying baseline
3264 clock slew on Microsoft Windows
3265 * Code cleanup in libntpq
3269 * Fix timerstats reporting
3273 * Reduce time required to set clock
3274 * Allow a timeout greater than 2 seconds
3278 * Backward incompatible command-line option change:
3279 -l/--filelog changed -l/--logfile (to be consistent with ntpd)
3283 * Update html2man. Fix some tags in the .html files
3284 * Distribute ntp-wait.html
3287 NTP 4.2.6p3 (Harlan Stenn <stenn@ntp.org>, 2011/01/03)
3289 Focus: Bug fixes and portability improvements
3293 This is a recommended upgrade.
3295 This release includes build infrastructure updates, code
3296 clean-ups, minor bug fixes, fixes for a number of minor
3297 ref-clock issues, and documentation revisions.
3299 Portability improvements in this release affect AIX, Atari FreeMiNT,
3300 FreeBSD4, Linux and Microsoft Windows.
3302 New features / changes in this release:
3305 * Use lsb_release to get information about Linux distributions.
3306 * 'test' is in /usr/bin (instead of /bin) on some systems.
3307 * Basic sanity checks for the ChangeLog file.
3308 * Source certain build files with ./filename for systems without . in PATH.
3309 * IRIX portability fix.
3310 * Use a single copy of the "libopts" code.
3311 * autogen/libopts upgrade.
3312 * configure.ac m4 quoting cleanup.
3315 * Do not bind to IN6_IFF_ANYCAST addresses.
3316 * Log the reason for exiting under Windows.
3317 * Multicast fixes for Windows.
3318 * Interpolation fixes for Windows.
3319 * IPv4 and IPv6 Multicast fixes.
3320 * Manycast solicitation fixes and general repairs.
3321 * JJY refclock cleanup.
3322 * NMEA refclock improvements.
3323 * Oncore debug message cleanup.
3324 * Palisade refclock now builds under Linux.
3325 * Give RAWDCF more baud rates.
3326 * Support Truetime Satellite clocks under Windows.
3327 * Support Arbiter 1093C Satellite clocks under Windows.
3328 * Make sure that the "filegen" configuration command defaults to "enable".
3329 * Range-check the status codes (plus other cleanup) in the RIPE-NCC driver.
3330 * Prohibit 'includefile' directive in remote configuration command.
3331 * Fix 'nic' interface bindings.
3332 * Fix the way we link with openssl if openssl is installed in the base
3337 * OpenSSL version display cleanup.
3340 * Many counters should be treated as unsigned.
3343 * Do not ignore replies with equal receive and transmit timestamps.
3346 * libntpq warning cleanup.
3349 * Correct SNMP type for "precision" and "resolution".
3350 * Update the MIB from the draft version to RFC-5907.
3353 * Display timezone offset when showing time for sntp in the local
3355 * Pay proper attention to RATE KoD packets.
3356 * Fix a miscalculation of the offset.
3357 * Properly parse empty lines in the key file.
3359 * Use tv_usec correctly in set_time().
3360 * Documentation cleanup.
3363 NTP 4.2.6p2 (Harlan Stenn <stenn@ntp.org>, 2010/07/08)
3365 Focus: Bug fixes and portability improvements
3369 This is a recommended upgrade.
3371 This release includes build infrastructure updates, code
3372 clean-ups, minor bug fixes, fixes for a number of minor
3373 ref-clock issues, improved KOD handling, OpenSSL related
3374 updates and documentation revisions.
3376 Portability improvements in this release affect Irix, Linux,
3377 Mac OS, Microsoft Windows, OpenBSD and QNX6
3379 New features / changes in this release:
3382 * Range syntax for the trustedkey configuration directive
3383 * Unified IPv4 and IPv6 restrict lists
3386 * Rate limiting and KOD handling
3389 * default connection to net-snmpd via a unix-domain socket
3390 * command-line 'socket name' option
3393 * support for the "passwd ..." syntax
3394 * key-type specific password prompts
3397 * MD5 authentication of an ntpd
3398 * Broadcast and crypto
3402 NTP 4.2.6p1 (Harlan Stenn <stenn@ntp.org>, 2010/04/09)
3404 Focus: Bug fixes, portability fixes, and documentation improvements
3408 This is a recommended upgrade.
3411 NTP 4.2.6 (Harlan Stenn <stenn@ntp.org>, 2009/12/08)
3413 Focus: enhancements and bug fixes.
3416 NTP 4.2.4p8 (Harlan Stenn <stenn@ntp.org>, 2009/12/08)
3418 Focus: Security Fixes
3422 This release fixes the following high-severity vulnerability:
3424 * [Sec 1331] DoS with mode 7 packets - CVE-2009-3563.
3426 See http://support.ntp.org/security for more information.
3428 NTP mode 7 (MODE_PRIVATE) is used by the ntpdc query and control utility.
3429 In contrast, ntpq uses NTP mode 6 (MODE_CONTROL), while routine NTP time
3430 transfers use modes 1 through 5. Upon receipt of an incorrect mode 7
3431 request or a mode 7 error response from an address which is not listed
3432 in a "restrict ... noquery" or "restrict ... ignore" statement, ntpd will
3433 reply with a mode 7 error response (and log a message). In this case:
3435 * If an attacker spoofs the source address of ntpd host A in a
3436 mode 7 response packet sent to ntpd host B, both A and B will
3437 continuously send each other error responses, for as long as
3438 those packets get through.
3440 * If an attacker spoofs an address of ntpd host A in a mode 7
3441 response packet sent to ntpd host A, A will respond to itself
3442 endlessly, consuming CPU and logging excessively.
3444 Credit for finding this vulnerability goes to Robin Park and Dmitri
3445 Vinokurov of Alcatel-Lucent.
3447 THIS IS A STRONGLY RECOMMENDED UPGRADE.
3450 ntpd now syncs to refclocks right away.
3452 Backward-Incompatible changes:
3454 ntpd no longer accepts '-v name' or '-V name' to define internal variables.
3455 Use '--var name' or '--dvar name' instead. (Bug 817)
3458 NTP 4.2.4p7 (Harlan Stenn <stenn@ntp.org>, 2009/05/04)
3460 Focus: Security and Bug Fixes
3464 This release fixes the following high-severity vulnerability:
3466 * [Sec 1151] Remote exploit if autokey is enabled. CVE-2009-1252
3468 See http://support.ntp.org/security for more information.
3470 If autokey is enabled (if ntp.conf contains a "crypto pw whatever"
3471 line) then a carefully crafted packet sent to the machine will cause
3472 a buffer overflow and possible execution of injected code, running
3473 with the privileges of the ntpd process (often root).
3475 Credit for finding this vulnerability goes to Chris Ries of CMU.
3477 This release fixes the following low-severity vulnerabilities:
3479 * [Sec 1144] limited (two byte) buffer overflow in ntpq. CVE-2009-0159
3480 Credit for finding this vulnerability goes to Geoff Keating of Apple.
3482 * [Sec 1149] use SO_EXCLUSIVEADDRUSE on Windows
3483 Credit for finding this issue goes to Dave Hart.
3485 This release fixes a number of bugs and adds some improvements:
3488 * Fix many compiler warnings
3489 * Many fixes and improvements for Windows
3490 * Adds support for AIX 6.1
3491 * Resolves some issues under MacOS X and Solaris
3493 THIS IS A STRONGLY RECOMMENDED UPGRADE.
3496 NTP 4.2.4p6 (Harlan Stenn <stenn@ntp.org>, 2009/01/07)
3502 This release fixes oCERT.org's CVE-2009-0021, a vulnerability affecting
3503 the OpenSSL library relating to the incorrect checking of the return
3504 value of EVP_VerifyFinal function.
3506 Credit for finding this issue goes to the Google Security Team for
3507 finding the original issue with OpenSSL, and to ocert.org for finding
3508 the problem in NTP and telling us about it.
3510 This is a recommended upgrade.
3512 NTP 4.2.4p5 (Harlan Stenn <stenn@ntp.org>, 2008/08/17)
3514 Focus: Minor Bugfixes
3516 This release fixes a number of Windows-specific ntpd bugs and
3517 platform-independent ntpdate bugs. A logging bugfix has been applied
3518 to the ONCORE driver.
3520 The "dynamic" keyword and is now obsolete and deferred binding to local
3521 interfaces is the new default. The minimum time restriction for the
3522 interface update interval has been dropped.
3524 A number of minor build system and documentation fixes are included.
3526 This is a recommended upgrade for Windows.
3529 NTP 4.2.4p4 (Harlan Stenn <stenn@ntp.org>, 2007/09/10)
3531 Focus: Minor Bugfixes
3533 This release updates certain copyright information, fixes several display
3534 bugs in ntpdc, avoids SIGIO interrupting malloc(), cleans up file descriptor
3535 shutdown in the parse refclock driver, removes some lint from the code,
3536 stops accessing certain buffers immediately after they were freed, fixes
3537 a problem with non-command-line specification of -6, and allows the loopback
3538 interface to share addresses with other interfaces.
3541 NTP 4.2.4p3 (Harlan Stenn <stenn@ntp.org>, 2007/06/29)
3543 Focus: Minor Bugfixes
3545 This release fixes a bug in Windows that made it difficult to
3546 terminate ntpd under windows.
3547 This is a recommended upgrade for Windows.
3550 NTP 4.2.4p2 (Harlan Stenn <stenn@ntp.org>, 2007/06/19)
3552 Focus: Minor Bugfixes
3554 This release fixes a multicast mode authentication problem,
3555 an error in NTP packet handling on Windows that could lead to
3556 ntpd crashing, and several other minor bugs. Handling of
3557 multicast interfaces and logging configuration were improved.
3558 The required versions of autogen and libopts were incremented.
3559 This is a recommended upgrade for Windows and multicast users.
3562 NTP 4.2.4 (Harlan Stenn <stenn@ntp.org>, 2006/12/31)
3564 Focus: enhancements and bug fixes.
3566 Dynamic interface rescanning was added to simplify the use of ntpd in
3567 conjunction with DHCP. GNU AutoGen is used for its command-line options
3568 processing. Separate PPS devices are supported for PARSE refclocks, MD5
3569 signatures are now provided for the release files. Drivers have been
3570 added for some new ref-clocks and have been removed for some older
3571 ref-clocks. This release also includes other improvements, documentation
3574 K&R C is no longer supported as of NTP-4.2.4. We are now aiming for ANSI
3578 NTP 4.2.0 (Harlan Stenn <stenn@ntp.org>, 2003/10/15)
3580 Focus: enhancements and bug fixes.
projects / FreeBSD / FreeBSD.git / blob