Focus: Security, Bug fixes, enhancements.
-Severity: MEDIUM ?
+Severity: MEDIUM
-This release fixes 1 medium-, 2 low-/medium-, and 1 informational/medum-severity
-vulnerabilities, and provides 59 other non-security fixes and improvements:
+This release fixes 2 low-/medium-, 1 informational/medum-, and 2 low-severity
+vulnerabilities in ntpd, one medium-severity vulernability in ntpq, and
+provides 65 other non-security fixes and improvements:
+
+* NTP Bug 3454: More soon
+
+* NTP Bug 3453: Interleaved symmetric mode cannot recover from bad
+ state (LOW/MED)
+ Date Resolved: Stable (4.2.8p11) 27 Feb 2018
+ References: Sec 3453
+ Affects: ntpd in ntp-4.2.8p4, up to but not including ntp-4.2.8p11.
+ CVSS2: MED 4.3 (AV:N/AC:M/Au:N/C:P/I:N/A:N)
+ Could score between 2.9 and 6.8.
+ CVSS3: LOW 3.1 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
+ Could score between 2.6 and 6.0.
+ Summary:
+ The fix for NtpBug2952 was incomplete, and while it fixed one
+ problem it created another. Specifically, it drops bad packets
+ before updating the "received" timestamp. This means a
+ third-party can inject a packet with a zero-origin timestamp,
+ meaning the sender wants to reset the association, and the
+ transmit timestamp in this bogus packet will be saved as the
+ most recent "received" timestamp. The real remote peer does
+ not know this value and this will disrupt the association until
+ the association resets.
+ Mitigation:
+ Implement BCP-38.
+ Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
+ or the NTP Public Services Project Download Page.
+ Use authentication with 'peer' mode.
+ Have enough sources of time.
+ Properly monitor your ntpd instances.
+ If ntpd stops running, auto-restart it without -g .
+ Credit:
+ This weakness was discovered by Miroslav Lichvar of Red Hat.
-update-leap needs the following perl modules:
+* NTP Bug 3415: Provide a way to prevent authenticated symmetric passive
+ peering (LOW)
+ Date Resolved: Stable (4.2.8p11) 27 Feb 2018
+ References: Sec 3012 / CVE-2016-1549 / VU#718152
+ Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
+ 4.3.0 up to, but not including 4.3.92. Resolved in 4.2.8p11.
+ CVSS2: LOW 3.5 - (AV:N/AC:M/Au:S/C:N/I:P/A:N)
+ CVSS3: LOW 3.1 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
+ Summary:
+ ntpd can be vulnerable to Sybil attacks. If a system is set up to
+ use a trustedkey and if one is not using the feature introduced in
+ ntp-4.2.8p6 allowing an optional 4th field in the ntp.keys file to
+ specify which IPs can serve time, a malicious authenticated peer
+ -- i.e. one where the attacker knows the private symmetric key --
+ can create arbitrarily-many ephemeral associations in order to win
+ the clock selection of ntpd and modify a victim's clock. Three
+ additional protections are offered in ntp-4.2.8p11. One is the
+ new 'noepeer' directive, which disables symmetric passive
+ ephemeral peering. Another is the new 'ippeerlimit' directive,
+ which limits the number of peers that can be created from an IP.
+ The third extends the functionality of the 4th field in the
+ ntp.keys file to include specifying a subnet range.
+ Mitigation:
+ Implement BCP-38.
+ Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
+ or the NTP Public Services Project Download Page.
+ Use the 'noepeer' directive to prohibit symmetric passive
+ ephemeral associations.
+ Use the 'ippeerlimit' directive to limit the number of peers
+ that can be created from an IP.
+ Use the 4th argument in the ntp.keys file to limit the IPs and
+ subnets that can be time servers.
+ Have enough sources of time.
+ Properly monitor your ntpd instances.
+ If ntpd stops running, auto-restart it without -g .
+ Credit:
+ This weakness was reported as Bug 3012 by Matthew Van Gundy of
+ Cisco ASIG, and separately by Stefan Moser as Bug 3415.
+
+* ntpq Bug 3414: decodearr() can write beyond its 'buf' limits (Medium)
+ Date Resolved: 27 Feb 2018
+ References: Sec 3414
+ Affects: ntpq in ntp-4.2.8p6, up to but not including ntp-4.2.8p11.
+ CVSS2: MED 6.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)
+ CVSS3: MED 5.0 CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
+ Summary:
+ ntpq is a monitoring and control program for ntpd. decodearr()
+ is an internal function of ntpq that is used to -- wait for it --
+ decode an array in a response string when formatted data is being
+ displayed. This is a problem in affected versions of ntpq if a
+ maliciously-altered ntpd returns an array result that will trip this
+ bug, or if a bad actor is able to read an ntpq request on its way to
+ a remote ntpd server and forge and send a response before the remote
+ ntpd sends its response. It's potentially possible that the
+ malicious data could become injectable/executable code.
+ Mitigation:
+ Implement BCP-38.
+ Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
+ or the NTP Public Services Project Download Page.
+ Credit:
+ This weakness was discovered by Michael Macnair of Thales e-Security.
+
+* NTP Bug 3412: ctl_getitem(): buffer read overrun leads to undefined
+ behavior and information leak (Info/Medium)
+ Date Resolved: 27 Feb 2018
+ References: Sec 3412
+ Affects: ntp-4.2.8p6, up to but not including ntp-4.2.8p11.
+ CVSS2: INFO 0.0 - MED 5.0 (AV:N/AC:L/Au:N/C:P/I:N/A:N) 0.0 if C:N
+ 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
+ 0.0 if C:N
+ Summary:
+ ctl_getitem() is used by ntpd to process incoming mode 6 packets.
+ A malicious mode 6 packet can be sent to an ntpd instance, and
+ if the ntpd instance is from 4.2.8p6 thru 4.2.8p10, that will
+ cause ctl_getitem() to read past the end of its buffer.
+ Mitigation:
+ Implement BCP-38.
+ Upgrade to ntp-4.2.8p11 or later from the NTP Project Download Page
+ or the NTP Public Services Project Download Page.
+ Have enough sources of time.
+ Properly monitor your ntpd instances.
+ If ntpd stops running, auto-restart it without -g .
+ Credit:
+ This weakness was discovered by Yihan Lian of Qihoo 360.
+
+* NTP Bug 3012: Sybil vulnerability: ephemeral association attack
+ Also see Bug 3415, above.
+ Date Mitigated: Stable (4.2.8p7) 26 Apr 2016; Dev (4.3.92) 26 Apr 2016
+ Date Resolved: Stable (4.2.8p11) 27 Feb 2018
+ References: Sec 3012 / CVE-2016-1549 / VU#718152
+ Affects: All ntp-4 releases up to, but not including 4.2.8p7, and
+ 4.3.0 up to, but not including 4.3.92. Resolved in 4.2.8p11.
+ CVSS2: LOW 3.5 - (AV:N/AC:M/Au:S/C:N/I:P/A:N)
+ CVSS3: MED 5.3 - CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
+ Summary:
+ ntpd can be vulnerable to Sybil attacks. If a system is set up
+ to use a trustedkey and if one is not using the feature
+ introduced in ntp-4.2.8p6 allowing an optional 4th field in the
+ ntp.keys file to specify which IPs can serve time, a malicious
+ authenticated peer -- i.e. one where the attacker knows the
+ private symmetric key -- can create arbitrarily-many ephemeral
+ associations in order to win the clock selection of ntpd and
+ modify a victim's clock. Two additional protections are
+ offered in ntp-4.2.8p11. One is the 'noepeer' directive, which
+ disables symmetric passive ephemeral peering. The other extends
+ the functionality of the 4th field in the ntp.keys file to
+ include specifying a subnet range.
+ Mitigation:
+ Implement BCP-38.
+ Upgrade to 4.2.8p11, or later, from the NTP Project Download Page or
+ the NTP Public Services Project Download Page.
+ Use the 'noepeer' directive to prohibit symmetric passive
+ ephemeral associations.
+ Use the 'ippeerlimit' directive to limit the number of peer
+ associations from an IP.
+ Use the 4th argument in the ntp.keys file to limit the IPs
+ and subnets that can be time servers.
+ Properly monitor your ntpd instances.
+ Credit:
+ This weakness was discovered by Matthew Van Gundy of Cisco ASIG.
+
+* Bug fixes:
+ [Bug 3457] OpenSSL FIPS mode regression <perlinger@ntp.org>
+ [Bug 3455] ntpd doesn't use scope id when binding multicast <perlinger@ntp.org>
+ - applied patch by Sean Haugh
+ [Bug 3452] PARSE driver prints uninitialized memory. <perlinger@ntp.org>
+ [Bug 3450] Dubious error messages from plausibility checks in get_systime()
+ - removed error log caused by rounding/slew, ensured postcondition <perlinger@ntp.org>
+ [Bug 3447] AES-128-CMAC (fixes) <perlinger@ntp.org>
+ - refactoring the MAC code, too
+ [Bug 3441] Validate the assumption that AF_UNSPEC is 0. stenn@ntp.org
+ [Bug 3439] When running multiple commands / hosts in ntpq... <perlinger@ntp.org>
+ - applied patch by ggarvey
+ [Bug 3438] Negative values and values > 999 days in... <perlinger@ntp.org>
+ - applied patch by ggarvey (with minor mods)
+ [Bug 3437] ntpd tries to open socket with AF_UNSPEC domain
+ - applied patch (with mods) by Miroslav Lichvar <perlinger@ntp.org>
+ [Bug 3435] anchor NTP era alignment <perlinger@ntp.org>
+ [Bug 3433] sntp crashes when run with -a. <stenn@ntp.org>
+ [Bug 3430] ntpq dumps core (SIGSEGV) for "keytype md2"
+ - fixed several issues with hash algos in ntpd, sntp, ntpq,
+ ntpdc and the test suites <perlinger@ntp.org>
+ [Bug 3424] Trimble Thunderbolt 1024 week millenium bug <perlinger@ntp.org>
+ - initial patch by Daniel Pouzzner
+ [Bug 3423] QNX adjtime() implementation error checking is
+ wrong <perlinger@ntp.org>
+ [Bug 3417] ntpq ifstats packet counters can be negative
+ made IFSTATS counter quantities unsigned <perlinger@ntp.org>
+ [Bug 3411] problem about SIGN(6) packet handling for ntp-4.2.8p10
+ - raised receive buffer size to 1200 <perlinger@ntp.org>
+ [Bug 3408] refclock_jjy.c: Avoid a wrong report of the coverity static
+ analysis tool. <abe@ntp.org>
+ [Bug 3405] update-leap.in: general cleanup, HTTPS support. Paul McMath.
+ [Bug 3404] Fix openSSL DLL usage under Windows <perlinger@ntp.org>
+ - fix/drop assumptions on OpenSSL libs directory layout
+ [Bug 3399] NTP: linker error in 4.2.8p10 during Linux cross-compilation
+ - initial patch by timeflies@mail2tor.com <perlinger@ntp.org>
+ [Bug 3398] tests fail with core dump <perlinger@ntp.org>
+ - patch contributed by Alexander Bluhm
+ [Bug 3397] ctl_putstr() asserts that data fits in its buffer
+ rework of formatting & data transfer stuff in 'ntp_control.c'
+ avoids unecessary buffers and size limitations. <perlinger@ntp.org>
+ [Bug 3394] Leap second deletion does not work on ntpd clients
+ - fixed handling of dynamic deletion w/o leap file <perlinger@ntp.org>
+ [Bug 3391] ntpd segfaults on startup due to small warmup thread stack size
+ - increased mimimum stack size to 32kB <perlinger@ntp.org>
+ [Bug 3367] Faulty LinuxPPS NMEA clock support in 4.2.8 <perlinger@ntp.org>
+ - reverted handling of PPS kernel consumer to 4.2.6 behavior
+ [Bug 3365] Updates driver40(-ja).html and miscopt.html <abe@ntp.org>
+ [Bug 3358] Spurious KoD log messages in .INIT. phase. HStenn.
+ [Bug 3016] wrong error position reported for bad ":config pool"
+ - fixed location counter & ntpq output <perlinger@ntp.org>
+ [Bug 2900] libntp build order problem. HStenn.
+ [Bug 2878] Tests are cluttering up syslog <perlinger@ntp.org>
+ [Bug 2737] Wrong phone number listed for USNO. ntp-bugs@bodosom.net,
+ perlinger@ntp.org
+ [Bug 2557] Fix Thunderbolt init. ntp-bugs@bodosom.net, perlinger@ntp.
+ [Bug 948] Trustedkey config directive leaks memory. <perlinger@ntp.org>
+ Use strlcpy() to copy strings, not memcpy(). HStenn.
+ Typos. HStenn.
+ test_ntp_scanner_LDADD needs ntpd/ntp_io.o. HStenn.
+ refclock_jjy.c: Add missing "%s" to an msyslog() call. HStenn.
+ Build ntpq and libntpq.a with NTP_HARD_*FLAGS. perlinger@ntp.org
+ Fix trivial warnings from 'make check'. perlinger@ntp.org
+ Fix bug in the override portion of the compiler hardening macro. HStenn.
+ record_raw_stats(): Log entire packet. Log writes. HStenn.
+ AES-128-CMAC support. BInglis, HStenn, JPerlinger.
+ sntp: tweak key file logging. HStenn.
+ sntp: pkt_output(): Improve debug output. HStenn.
+ update-leap: updates from Paul McMath.
+ When using pkg-config, report --modversion. HStenn.
+ Clean up libevent configure checks. HStenn.
+ sntp: show the IP of who sent us a crypto-NAK. HStenn.
+ Allow .../N to specify subnet bits for IPs in ntp.keys. HStenn, JPerlinger.
+ authistrustedip() - use it in more places. HStenn, JPerlinger.
+ New sysstats: sys_lamport, sys_tsrounding. HStenn.
+ Update ntp.keys .../N documentation. HStenn.
+ Distribute testconf.yml. HStenn.
+ Add DPRINTF(2,...) lines to receive() for packet drops. HStenn.
+ Rename the configuration flag fifo variables. HStenn.
+ Improve saveconfig output. HStenn.
+ Decode restrict flags on receive() debug output. HStenn.
+ Decode interface flags on receive() debug output. HStenn.
+ Warn the user if deprecated "driftfile name WanderThreshold" is used. HStenn.
+ Update the documentation in ntp.conf.def . HStenn.
+ restrictions() must return restrict flags and ippeerlimit. HStenn.
+ Update ntpq peer documentation to describe the 'p' type. HStenn.
+ Rename restrict 'flags' to 'rflags. Use an enum for the values. HStenn.
+ Provide dump_restricts() for debugging. HStenn.
+ Use consistent 4th arg type for [gs]etsockopt. JPerlinger.
+
+* Other items:
+
+* update-leap needs the following perl modules:
Net::SSLeay
IO::Socket::SSL
-New sysstats variables: sys_lamport, sys_tsrounding
+* New sysstats variables: sys_lamport, sys_tsrounding
See them with: ntpq -c "rv 0 ss_lamport,ss_tsrounding"
sys_lamport counts the number of observed Lamport violations, while
sys_tsrounding counts observed timestamp rounding events.
-New ntp.conf items:
+* New ntp.conf items:
- restrict ... noepeer
- restrict ... ippeerlimit N
in which case an attacker might spin up multiple authenticated sessions
from different ports. This directive should be helpful in this case.
-New ntp.keys feature: Each IP in the optional list of IPs in the 4th
+* New ntp.keys feature: Each IP in the optional list of IPs in the 4th
field may contain a /subnetbits specification, which identifies the
scope of IPs that may use this key. This IP/subnet restriction can be
used to limit the IPs that may use the key in most all situations where
Implement BCP-38.
Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
or the NTP Public Services Project Download Page
- Properly monitor your =ntpd= instances
+ Properly monitor your ntpd instances
Credit: This weakness was discovered by Stephen Gray and
Matthew Van Gundy of Cisco ASIG.
Implement BCP-38.
Upgrade to 4.2.8p7, or later, from the NTP Project Download Page
or the NTP Public Services Project Download Page
- Properly monitor your =ntpd= instances
+ Properly monitor your ntpd instances
Credit: This weakness was discovered by Yihan Lian of the Cloud
Security Team, Qihoo 360.
Configure 'ntpd' to get time from multiple sources.
Upgrade to 4.2.8p6, or later, from the NTP Project Download Page
or the NTP Public Services Project Download Page.
- Monitor your 'ntpd= instances.
+ Monitor your 'ntpd' instances.
Credit: This weakness was discovered by Matthey Van Gundy and
Jonathan Gardner of Cisco ASIG.
projects / thirdparty / ntp.git / commitdiff
