SUSE SLED12 / SLES12 Security Update : ntp (SUSE-SU-2016:1568-1)

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 4.2.8p8 to fix 17 security issues.

These security issues were fixed :

- CVE-2016-4956: Broadcast interleave (bsc#982068).

- CVE-2016-2518: Crafted addpeer with hmode > 7 causes
array wraparound with MATCH_ASSOC (bsc#977457).

- CVE-2016-2519: ctl_getitem() return value not always
checked (bsc#977458).

- CVE-2016-4954: Processing spoofed server packets
(bsc#982066).

- CVE-2016-4955: Autokey association reset (bsc#982067).

- CVE-2015-7974: NTP did not verify peer associations of
symmetric keys when authenticating packets, which might
allowed remote attackers to conduct impersonation
attacks via an arbitrary trusted key, aka a 'skeleton
key (bsc#962960).

- CVE-2016-4957: CRYPTO_NAK crash (bsc#982064).

- CVE-2016-2516: Duplicate IPs on unconfig directives will
cause an assertion botch (bsc#977452).

- CVE-2016-2517: Remote configuration
trustedkey/requestkey values are not properly validated
(bsc#977455).

- CVE-2016-4953: Bad authentication demobilizes ephemeral
associations (bsc#982065).

- CVE-2016-1547: CRYPTO-NAK DoS (bsc#977459).

- CVE-2016-1551: Refclock impersonation vulnerability,
AKA: refclock-peering (bsc#977450).

- CVE-2016-1550: Improve NTP security against buffer
comparison timing attacks, authdecrypt-timing, AKA:
authdecrypt-timing (bsc#977464).

- CVE-2016-1548: Interleave-pivot - MITIGATION ONLY
(bsc#977461).

- CVE-2016-1549: Sybil vulnerability: ephemeral
association attack, AKA: ntp-sybil - MITIGATION ONLY
(bsc#977451).

This release also contained improved patches for CVE-2015-7704,
CVE-2015-7705, CVE-2015-7974.

These non-security issues were fixed :

- bsc#979302: Change the process name of the forking DNS
worker process to avoid the impression that ntpd is
started twice.

- bsc#981422: Don't ignore SIGCHILD because it breaks
wait().

- bsc#979981: ntp-wait does not accept fractional seconds,
so use 1 instead of 0.2 in ntp-wait.service.

- Separate the creation of ntp.keys and key #1 in it to
avoid problems when upgrading installations that have
the file, but no key #1, which is needed e.g. by 'rcntp
addserver'.

- bsc#957226: Restrict the parser in the startup script to
the first occurrance of 'keys' and 'controlkey' in
ntp.conf.

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/957226
https://bugzilla.suse.com/962960
https://bugzilla.suse.com/977450
https://bugzilla.suse.com/977451
https://bugzilla.suse.com/977452
https://bugzilla.suse.com/977455
https://bugzilla.suse.com/977457
https://bugzilla.suse.com/977458
https://bugzilla.suse.com/977459
https://bugzilla.suse.com/977461
https://bugzilla.suse.com/977464
https://bugzilla.suse.com/979302
https://bugzilla.suse.com/979981
https://bugzilla.suse.com/981422
https://bugzilla.suse.com/982064
https://bugzilla.suse.com/982065
https://bugzilla.suse.com/982066
https://bugzilla.suse.com/982067
https://bugzilla.suse.com/982068
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-2015-7974.html
https://www.suse.com/security/cve/CVE-2016-1547.html
https://www.suse.com/security/cve/CVE-2016-1548.html
https://www.suse.com/security/cve/CVE-2016-1549.html
https://www.suse.com/security/cve/CVE-2016-1550.html
https://www.suse.com/security/cve/CVE-2016-1551.html
https://www.suse.com/security/cve/CVE-2016-2516.html
https://www.suse.com/security/cve/CVE-2016-2517.html
https://www.suse.com/security/cve/CVE-2016-2518.html
https://www.suse.com/security/cve/CVE-2016-2519.html
https://www.suse.com/security/cve/CVE-2016-4953.html
https://www.suse.com/security/cve/CVE-2016-4954.html
https://www.suse.com/security/cve/CVE-2016-4955.html
https://www.suse.com/security/cve/CVE-2016-4956.html
https://www.suse.com/security/cve/CVE-2016-4957.html
http://www.nessus.org/u?57fb52ad

Solution :

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

SUSE Linux Enterprise Server 12 :

zypper in -t patch SUSE-SLE-SERVER-12-2016-933=1

SUSE Linux Enterprise Desktop 12 :

zypper in -t patch SUSE-SLE-DESKTOP-12-2016-933=1

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

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 6.2
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

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