FreeBSD : ntp -- 13 low- and medium-severity vulnerabilities (c4a18a12-77fc-11e5-a687-206a8a720317)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing one or more security-related
updates.

Description :

ntp.org reports :

NTF's NTP Project has been notified of the following 13 low- and
medium-severity vulnerabilities that are fixed in ntp-4.2.8p4,
released on Wednesday, 21 October 2015 :

- Bug 2941 CVE-2015-7871 NAK to the Future: Symmetric association
authentication bypass via crypto-NAK (Cisco ASIG)

- Bug 2922 CVE-2015-7855 decodenetnum() will ASSERT botch instead of
returning FAIL on some bogus values (IDA)

- Bug 2921 CVE-2015-7854 Password Length Memory Corruption
Vulnerability. (Cisco TALOS)

- Bug 2920 CVE-2015-7853 Invalid length data provided by a custom
refclock driver could cause a buffer overflow. (Cisco TALOS)

- Bug 2919 CVE-2015-7852 ntpq atoascii() Memory Corruption
Vulnerability. (Cisco TALOS)

- Bug 2918 CVE-2015-7851 saveconfig Directory Traversal Vulnerability.
(OpenVMS) (Cisco TALOS)

- Bug 2917 CVE-2015-7850 remote config logfile-keyfile. (Cisco TALOS)

- Bug 2916 CVE-2015-7849 trusted key use-after-free. (Cisco TALOS)

- Bug 2913 CVE-2015-7848 mode 7 loop counter underrun. (Cisco TALOS)

- Bug 2909 CVE-2015-7701 Slow memory leak in CRYPTO_ASSOC. (Tenable)

- Bug 2902 : CVE-2015-7703 configuration directives 'pidfile' and
'driftfile' should only be allowed locally. (RedHat)

- Bug 2901 : CVE-2015-7704, CVE-2015-7705 Clients that receive a KoD
should validate the origin timestamp field. (Boston University)

- Bug 2899 : CVE-2015-7691, CVE-2015-7692, CVE-2015-7702 Incomplete
autokey data packet length checks. (Tenable)

The only generally-exploitable bug in the above list is the crypto-NAK
bug, which has a CVSS2 score of 6.4.

Additionally, three bugs that have already been fixed in ntp-4.2.8 but
were not fixed in ntp-4.2.6 as it was EOL'd have a security component,
but are all below 1.8 CVSS score, so we're reporting them here :

- Bug 2382 : Peer precision < -31 gives division by zero

- Bug 1774 : Segfaults if cryptostats enabled when built without
OpenSSL

- Bug 1593 : ntpd abort in free() with logconfig syntax error

See also :

http://www.nessus.org/u?fec88bd0
http://www.nessus.org/u?4a0523ed
https://www.tenable.com/security/research/tra-2015-04

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)

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