USN-2078-1: libXfont vulnerability

7 January 2014

libxfont vulnerability

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

  • Ubuntu 13.10
  • Ubuntu 13.04
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS


libXfont could be made to crash or run programs as an administrator if it opened a specially crafted font file.

Software Description

  • libxfont - X11 font rasterisation library


It was discovered that libXfont incorrectly handled certain malformed BDF fonts. An attacker could use a specially crafted font file to cause libXfont to crash, or possibly execute arbitrary code in order to gain privileges. The default compiler options for affected releases should reduce the vulnerability to a denial of service.

Update instructions

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

Ubuntu 13.10
libxfont1 - 1:1.4.6-1ubuntu0.1
Ubuntu 13.04
libxfont1 - 1:1.4.5-2ubuntu0.13.04.1
Ubuntu 12.10
libxfont1 - 1:1.4.5-2ubuntu0.12.10.1
Ubuntu 12.04 LTS
libxfont1 - 1:1.4.4-1ubuntu0.1
Ubuntu 10.04 LTS
libxfont1 - 1:1.4.1-1ubuntu0.2

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.