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Ubuntu Security Notice USN-1502-1
July 11, 2012

xorg-server vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

The X.Org X server could be made to crash if a specially crafted input
device was added.

Software Description:
- xorg-server: X.Org X server

Details:

Ken Mixter discovered a format string vulnerability in the
LogVHdrMessageVerb function when handling input device names. This
could allow a local attacker to cause a denial of service or possibly
execute arbitrary code.

The default compiler options for the affected release should reduce
the vulnerability to a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 LTS:
  xserver-xorg-core               2:1.11.4-0ubuntu10.5

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1502-1
  CVE-2012-2118

Package Information:
  https://launchpad.net/ubuntu/+source/xorg-server/2:1.11.4-0ubuntu10.5