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Date : Thu, 22 Oct 2015 16:06:03 +0200
Type : VULN
Sujet : CERT-Renater : 2015/VULN222 (NTP : October 2015 NTP Security Vulnerability Announcement (Medium))

                   Note d'Information No. 2015/VULN222

DATE                : 22/10/2015


OPERATING SYSTEM(S): Systems running NTP versions prior to ntp-4.2.8p4.


October 2015 NTP Security Vulnerability Announcement (Medium)

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


      151021: ntp-4.2.8p4 released.
      151020: CERT & Mitre updated with final drafts of announcement
      151019: NAK bug addition and new CVE#'s announced to CERT.
      151017: Advance notification of NAK bug being added was sent to
       authorized NTP Consortium members..
      151014: pre-release patch availability announced to CERT.
      151009: notification of public release date change to 21Oct sent
       to members and reporters and Mitre
      151006: pre-release patches sent to authorized NTP Consortium
      150826: Initial notification of 2909. Analysis begins.
      150826: CVE number clarification requested from Mitre.
      150826: Advance notification sent to authorized NTP Consortium
       members for 1593,1774, 2382, 2899, 2902.
      150820: Initial notification of 2902. Analysis begins.
      150811: Initial notification of 2899. Analysis begins.

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