USN-1402-1: libpng vulnerability

22 March 2012

libpng vulnerability

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

  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 8.04 LTS


libpng could be made to crash or run programs as your login if it opened a specially crafted file.

Software Description

  • libpng - PNG (Portable Network Graphics) file library


It was discovered that libpng did not properly process compressed chunks. If a user or automated system using libpng were tricked into opening a specially crafted image, an attacker could exploit this to cause a denial of service or execute code with the privileges of the user invoking the program.

Update instructions

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

Ubuntu 11.10
libpng12-0 - 1.2.46-3ubuntu1.2
Ubuntu 11.04
libpng12-0 - 1.2.44-1ubuntu3.3
Ubuntu 10.10
libpng12-0 - 1.2.44-1ubuntu0.3
Ubuntu 10.04 LTS
libpng12-0 - 1.2.42-1ubuntu2.4
Ubuntu 8.04 LTS
libpng12-0 - 1.2.15~beta5-3ubuntu0.6

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.