=========================================================================Ubuntu Security Notice USN-1854-1
June 05, 2013

libx11 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.04
- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in libx11.

Software Description:
- libx11: X11 client-side 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:
  libx11-6                        2:1.5.0-1ubuntu1.1

Ubuntu 12.10:
  libx11-6                        2:1.5.0-1ubuntu0.1

Ubuntu 12.04 LTS:
  libx11-6                        2:1.4.99.1-0ubuntu2.1

Ubuntu 10.04 LTS:
  libx11-6                        2:1.3.2-1ubuntu3.1

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

References:
  https://ubuntu.com/security/notices/USN-1854-1
  CVE-2013-1981, CVE-2013-1997, CVE-2013-2004

Package Information:
  https://launchpad.net/ubuntu/+source/libx11/2:1.5.0-1ubuntu1.1
  https://launchpad.net/ubuntu/+source/libx11/2:1.5.0-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libx11/2:1.4.99.1-0ubuntu2.1
  https://launchpad.net/ubuntu/+source/libx11/2:1.3.2-1ubuntu3.1