Ubuntu 10.04 LTS / 12.04 LTS / 14.04 LTS / 14.10 : bsd-mailx vulnerability (USN-2455-1)

Ubuntu Security Notice (C) 2015-2016 Canonical, Inc. / NASL script (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

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

Description :

It was discovered that bsd-mailx contained a feature that allowed
syntactically valid email addresses to be treated as shell commands. A
remote attacker could possibly use this issue with a valid email
address to execute arbitrary commands.

This functionality has now been disabled by default, and can be
re-enabled with the 'expandaddr' configuration option. This update
alone does not remove all possibilities of command execution. In
environments where scripts use mailx to process arbitrary email
addresses, it is recommended to modify them to use a '--' separator
before the address to properly handle those that begin with '-'.

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 bsd-mailx 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 : 6.1
(CVSS2#E:U/RL:ND/RC:UR)
Public Exploit Available : false

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 80413 ()

Bugtraq ID: 71701

CVE ID: CVE-2014-7844

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