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Debian: CVE-2015-7851: ntp - security update

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Debian: CVE-2015-7851: ntp - security update



Directory traversal vulnerability in the save_config function in ntpd in ntp_control.c in NTP before 4.2.8p4, when used on systems that do not use '

Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.

From SUSE_CVE-2015-7851:

This CVE is addressed in the SUSE advisories SUSE-SU-2015:2058-1, openSUSE-SU-2015:2016-1

From VID-C4A18A12-77FC-11E5-A687-206A8A720317:

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.


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

From DLA-335-1:

ntp - security update

#39; or '/' characters for directory separation such as OpenVMS, allows remote authenticated users to overwrite arbitrary files.


  • debian-upgrade-ntp

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