USN-1854-1: libx11 vulnerabilities

5 June 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


Several security issues were fixed in libx11.

Software Description

  • libx11 - X11 client-side library


Ilja van Sprundel discovered multiple security issues in various 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:
Ubuntu 10.04 LTS
libx11-6 - 2:1.3.2-1ubuntu3.1

To update your system, please follow these instructions:

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