USN-1854-1: libx11 vulnerabilities

Ubuntu Security Notice USN-1854-1

5th 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 version:

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.


CVE-2013-1981, CVE-2013-1997, CVE-2013-2004