[USN-1858-1] libxfixes vulnerability

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==========================================================================
Ubuntu Security Notice USN-1858-1
June 05, 2013

libxfixes vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in libxfixes.

Software Description:
- libxfixes: X11 miscellaneous fixes extension library

Details:

Ilja van Sprundel discovered multiple security issues in various X.org
libraries and components. An attacker could use these issues to cause
applications to crash, resulting in a denial of service, or possibly
execute arbitrary code.

Update instructions:

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

Ubuntu 13.04:
libxfixes3 1:5.0-4ubuntu5.13.04.1

Ubuntu 12.10:
libxfixes3 1:5.0-4ubuntu5.12.10.1

Ubuntu 12.04 LTS:
libxfixes3 1:5.0-4ubuntu4.1

After a standard system update you need to restart your session to make all
the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1858-1
CVE-2013-1983

Package Information:
https://launchpad.net/ubuntu/+source/libxfixes/1:5.0-4ubuntu5.13.04.1
https://launchpad.net/ubuntu/+source/libxfixes/1:5.0-4ubuntu5.12.10.1
https://launchpad.net/ubuntu/+source/libxfixes/1:5.0-4ubuntu4.1