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USN-1191-1: libXfont vulnerability

15 August 2011

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



  • libxfont - X11 font rasterisation library


Tomas Hoger discovered that libXfont incorrectly handled certain malformed
compressed 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.

Update instructions

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

Ubuntu 11.04
Ubuntu 10.10
Ubuntu 10.04

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