SUSE SLED12 / SLES12 Security Update : ntp (SUSE-SU-2016:1247-1)

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote SUSE host is missing one or more security updates.

Description :

ntp was updated to version 4.2.8p6 to fix 28 security issues.

Major functional changes :

- The 'sntp' commandline tool changed its option handling
in a major way, some options have been renamed or
dropped.

- 'controlkey 1' is added during update to ntp.conf to
allow sntp to work.

- The local clock is being disabled during update.

- ntpd is no longer running chrooted.

Other functional changes :

- ntp-signd is installed.

- 'enable mode7' can be added to the configuration to
allow ntdpc to work as compatibility mode option.

- 'kod' was removed from the default restrictions.

- SHA1 keys are used by default instead of MD5 keys.

Also yast2-ntp-client was updated to match some sntp syntax changes.
(bsc#937837)

These security issues were fixed :

- CVE-2015-8158: Fixed potential infinite loop in ntpq
(bsc#962966).

- CVE-2015-8138: Zero Origin Timestamp Bypass
(bsc#963002).

- CVE-2015-7979: Off-path Denial of Service (DoS) attack
on authenticated broadcast mode (bsc#962784).

- CVE-2015-7978: Stack exhaustion in recursive traversal
of restriction list (bsc#963000).

- CVE-2015-7977: reslist NULL pointer dereference
(bsc#962970).

- CVE-2015-7976: ntpq saveconfig command allows dangerous
characters in filenames (bsc#962802).

- CVE-2015-7975: nextvar() missing length check
(bsc#962988).

- CVE-2015-7974: Skeleton Key: Missing key check allows
impersonation between authenticated peers (bsc#962960).

- CVE-2015-7973: Replay attack on authenticated broadcast
mode (bsc#962995).

- CVE-2015-8140: ntpq vulnerable to replay attacks
(bsc#962994).

- CVE-2015-8139: Origin Leak: ntpq and ntpdc, disclose
origin (bsc#962997).

- CVE-2015-5300: MITM attacker could have forced ntpd to
make a step larger than the panic threshold
(bsc#951629).

- CVE-2015-7871: NAK to the Future: Symmetric association
authentication bypass via crypto-NAK (bsc#951608).

- CVE-2015-7855: decodenetnum() will ASSERT botch instead
of returning FAIL on some bogus values (bsc#951608).

- CVE-2015-7854: Password Length Memory Corruption
Vulnerability (bsc#951608).

- CVE-2015-7853: Invalid length data provided by a custom
refclock driver could cause a buffer overflow
(bsc#951608).

- CVE-2015-7852: ntpq atoascii() Memory Corruption
Vulnerability (bsc#951608).

- CVE-2015-7851: saveconfig Directory Traversal
Vulnerability (bsc#951608).

- CVE-2015-7850: remote config logfile-keyfile
(bsc#951608).

- CVE-2015-7849: trusted key use-after-free (bsc#951608).

- CVE-2015-7848: mode 7 loop counter underrun
(bsc#951608).

- CVE-2015-7701: Slow memory leak in CRYPTO_ASSOC
(bsc#951608).

- CVE-2015-7703: configuration directives 'pidfile' and
'driftfile' should only be allowed locally (bsc#951608).

- CVE-2015-7704, CVE-2015-7705: Clients that receive a KoD
should validate the origin timestamp field (bsc#951608).

- CVE-2015-7691, CVE-2015-7692, CVE-2015-7702: Incomplete
autokey data packet length checks (bsc#951608).

These non-security issues were fixed :

- fate#320758 bsc#975981: Enable compile-time support for
MS-SNTP (--enable-ntp-signd). This replaces the w32
patches in 4.2.4 that added the authreg directive.

- bsc#962318: Call /usr/sbin/sntp with full path to
synchronize in start-ntpd. When run as cron job,
/usr/sbin/ is not in the path, which caused the
synchronization to fail.

- bsc#782060: Speedup ntpq.

- bsc#916617: Add /var/db/ntp-kod.

- bsc#956773: Add ntp-ENOBUFS.patch to limit a warning
that might happen quite a lot on loaded systems.

- bsc#951559,bsc#975496: Fix the TZ offset output of sntp
during DST.

- Add ntp-fork.patch and build with threads disabled to
allow name resolution even when running chrooted.

- Add a controlkey line to /etc/ntp.conf if one does not
already exist to allow runtime configuuration via ntpq.

- bsc#946386: Temporarily disable memlock to avoid
problems due to high memory usage during name
resolution.

- bsc#905885: Use SHA1 instead of MD5 for symmetric keys.

- Improve runtime configuration :

- Read keytype from ntp.conf

- Don't write ntp keys to syslog.

- Fix legacy action scripts to pass on command line
arguments.

- bsc#944300: Remove 'kod' from the restrict line in
ntp.conf.

- bsc#936327: Use ntpq instead of deprecated ntpdc in
start-ntpd.

- Add a controlkey to ntp.conf to make the above work.

- Don't let 'keysdir' lines in ntp.conf trigger the 'keys'
parser.

- Disable mode 7 (ntpdc) again, now that we don't use it
anymore.

- Add 'addserver' as a new legacy action.

- bsc#910063: Fix the comment regarding addserver in
ntp.conf.

- bsc#926510: Disable chroot by default.

- bsc#920238: Enable ntpdc for backwards compatibility.

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

See also :

https://bugzilla.suse.com/782060
https://bugzilla.suse.com/905885
https://bugzilla.suse.com/910063
https://bugzilla.suse.com/916617
https://bugzilla.suse.com/920238
https://bugzilla.suse.com/926510
https://bugzilla.suse.com/936327
https://bugzilla.suse.com/937837
https://bugzilla.suse.com/942587
https://bugzilla.suse.com/944300
https://bugzilla.suse.com/946386
https://bugzilla.suse.com/951559
https://bugzilla.suse.com/951608
https://bugzilla.suse.com/951629
https://bugzilla.suse.com/954982
https://bugzilla.suse.com/956773
https://bugzilla.suse.com/962318
https://bugzilla.suse.com/962784
https://bugzilla.suse.com/962802
https://bugzilla.suse.com/962960
https://bugzilla.suse.com/962966
https://bugzilla.suse.com/962970
https://bugzilla.suse.com/962988
https://bugzilla.suse.com/962994
https://bugzilla.suse.com/962995
https://bugzilla.suse.com/962997
https://bugzilla.suse.com/963000
https://bugzilla.suse.com/963002
https://bugzilla.suse.com/975496
https://bugzilla.suse.com/975981
https://www.suse.com/security/cve/CVE-2015-5300.html
https://www.suse.com/security/cve/CVE-2015-7691.html
https://www.suse.com/security/cve/CVE-2015-7692.html
https://www.suse.com/security/cve/CVE-2015-7701.html
https://www.suse.com/security/cve/CVE-2015-7702.html
https://www.suse.com/security/cve/CVE-2015-7703.html
https://www.suse.com/security/cve/CVE-2015-7704.html
https://www.suse.com/security/cve/CVE-2015-7705.html
https://www.suse.com/security/cve/CVE-2015-7848.html
https://www.suse.com/security/cve/CVE-2015-7849.html
https://www.suse.com/security/cve/CVE-2015-7850.html
https://www.suse.com/security/cve/CVE-2015-7851.html
https://www.suse.com/security/cve/CVE-2015-7852.html
https://www.suse.com/security/cve/CVE-2015-7853.html
https://www.suse.com/security/cve/CVE-2015-7854.html
https://www.suse.com/security/cve/CVE-2015-7855.html
https://www.suse.com/security/cve/CVE-2015-7871.html
https://www.suse.com/security/cve/CVE-2015-7973.html
https://www.suse.com/security/cve/CVE-2015-7974.html
https://www.suse.com/security/cve/CVE-2015-7975.html
https://www.suse.com/security/cve/CVE-2015-7976.html
https://www.suse.com/security/cve/CVE-2015-7977.html
https://www.suse.com/security/cve/CVE-2015-7978.html
https://www.suse.com/security/cve/CVE-2015-7979.html
https://www.suse.com/security/cve/CVE-2015-8138.html
https://www.suse.com/security/cve/CVE-2015-8139.html
https://www.suse.com/security/cve/CVE-2015-8140.html
https://www.suse.com/security/cve/CVE-2015-8158.html
http://www.nessus.org/u?17f35360
https://www.tenable.com/security/research/tra-2015-04

Solution :

To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Software Development Kit 12 :

zypper in -t patch SUSE-SLE-SDK-12-2016-727=1

SUSE Linux Enterprise Server 12 :

zypper in -t patch SUSE-SLE-SERVER-12-2016-727=1

SUSE Linux Enterprise Desktop 12 :

zypper in -t patch SUSE-SLE-DESKTOP-12-2016-727=1

To bring your system up-to-date, use 'zypper patch'.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.4
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true