Ubuntu 12.04 LTS / 14.04 LTS / 15.10 : openssh vulnerabilities (USN-2966-1)

Ubuntu Security Notice (C) 2016-2017 Canonical, Inc. / NASL script (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing a security-related patch.

Description :

Shayan Sadigh discovered that OpenSSH incorrectly handled environment
files when the UseLogin feature is enabled. A local attacker could use
this issue to gain privileges. (CVE-2015-8325)

Ben Hawkes discovered that OpenSSH incorrectly handled certain network
traffic. A remote attacker could possibly use this issue to cause
OpenSSH to crash, resulting in a denial of service. This issue only
applied to Ubuntu 15.10. (CVE-2016-1907)

Thomas Hoger discovered that OpenSSH incorrectly handled untrusted X11
forwarding when the SECURITY extension is disabled. A connection
configured as being untrusted could get switched to trusted in certain
scenarios, contrary to expectations. (CVE-2016-1908)

It was discovered that OpenSSH incorrectly handled certain X11
forwarding data. A remote authenticated attacker could possibly use
this issue to bypass certain intended command restrictions.
(CVE-2016-3115).

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

Solution :

Update the affected openssh-server package.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 6.4
(CVSS2#E:U/RL:U/RC:C)
Public Exploit Available : false

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 91086 ()

Bugtraq ID:

CVE ID: CVE-2015-8325
CVE-2016-1907
CVE-2016-1908
CVE-2016-3115

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