USN-1367-1: libpng vulnerabilities

16 February 2012

libpng vulnerabilities

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

Summary

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

Details

It was discovered that libpng did not properly verify the embedded profile length of iCCP chunks. An attacker could exploit this to cause a denial of service via application crash. This issue only affected Ubuntu 8.04 LTS. (CVE-2009-5063)

Jueri Aedla discovered that libpng did not properly verify the size used when allocating memory during chunk decompression. 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. (CVE-2011-3026)

Update instructions

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

Ubuntu 11.10
libpng12-0 - 1.2.46-3ubuntu1.1
Ubuntu 11.04
libpng12-0 - 1.2.44-1ubuntu3.2
Ubuntu 10.10
libpng12-0 - 1.2.44-1ubuntu0.2
Ubuntu 10.04 LTS
libpng12-0 - 1.2.42-1ubuntu2.3
Ubuntu 8.04 LTS
libpng12-0 - 1.2.15~beta5-3ubuntu0.5

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart your session to make all the necessary changes.

References