USN-1857-1: libxext vulnerability

Ubuntu Security Notice USN-1857-1

5th June, 2013

libxext vulnerability

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 libxext.

Software description

  • libxext - X11 miscellaneous extensions 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 version:

Ubuntu 13.04:
libxext6 2:1.3.1-2ubuntu0.13.04.1
Ubuntu 12.10:
libxext6 2:1.3.1-2ubuntu0.12.10.1
Ubuntu 12.04 LTS:
libxext6 2:1.3.0-3ubuntu0.1
Ubuntu 10.04 LTS:
libxext6 2:1.1.1-2ubuntu0.1

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.