Ubuntu 11.10 : lightdm vulnerabilities (USN-1262-1)

Ubuntu Security Notice (C) 2011-2016 Canonical, Inc. / NASL script (C) 2011-2016 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing one or more security-related
patches.

Description :

It was discovered that Light Display Manager incorrectly handled
privileges when reading .dmrc files. A local attacker could exploit
this issue to read arbitrary configuration files, bypassing intended
permissions. (CVE-2011-3153)

It was discovered that Light Display Manager incorrectly handled links
when adjusting permissions on .Xauthority files. A local attacker
could exploit this issue to access arbitrary files, and possibly
obtain increased privileges. In the default Ubuntu installation, this
would be prevented by the Yama link restrictions. (CVE-2011-4105).

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 liblightdm-gobject-1-0, liblightdm-qt-1-0 and / or
lightdm packages.

Risk factor :

Low / CVSS Base Score : 1.9
(CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N)
CVSS Temporal Score : 1.6
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 56854 ()

Bugtraq ID: 50511
50685
50688

CVE ID: CVE-2011-3153
CVE-2011-4105