USN-2078-1: libXfont vulnerability

Ubuntu Security Notice USN-2078-1

7th 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

Summary

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

Details

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 version:

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: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2013-6462