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Ubuntu Security Notice USN-1191-1
August 15, 2011

libxfont vulnerability

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

• Ubuntu 11.04
• Ubuntu 10.10
• Ubuntu 10.04 LTS

Summary:

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

Software Description:

• libxfont: X11 font rasterisation library

Details:

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:
libxfont1 1:1.4.3-2ubuntu0.1

Ubuntu 10.10:
libxfont1 1:1.4.2-1ubuntu0.1

Ubuntu 10.04 LTS:
libxfont1 1:1.4.1-1ubuntu0.1

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

References:
http://www.ubuntu.com/usn/usn-1191-1
CVE-2011-2895

Package Information:
https://launchpad.net/ubuntu/+source/libxfont/1:1.4.3-2ubuntu0.1
https://launchpad.net/ubuntu/+source/libxfont/1:1.4.2-1ubuntu0.1
https://launchpad.net/ubuntu/+source/libxfont/1:1.4.1-1ubuntu0.1