USN-2815-1: libpng vulnerabilities

19 November 2015

libpng vulnerabilities

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

  • Ubuntu 15.10
  • Ubuntu 15.04
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 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

Mikulas Patocka discovered that libpng incorrectly handled certain large fields. If a user or automated system using libpng were tricked into opening a specially crafted image, an attacker could exploit this to cause libpng to crash, leading to a denial of service. This issue only affected Ubuntu 12.04 LTS. (CVE-2012-3425)

Qixue Xiao discovered that libpng incorrectly handled certain time values. If a user or automated system using libpng were tricked into opening a specially crafted image, an attacker could exploit this to cause libpng to crash, leading to a denial of service. (CVE-2015-7981)

It was discovered that libpng incorrectly handled certain small bit-depth values. 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-2015-8126)

Update instructions

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

Ubuntu 15.10
libpng12-0 - 1.2.51-0ubuntu3.15.10.1
Ubuntu 15.04
libpng12-0 - 1.2.51-0ubuntu3.15.04.1
Ubuntu 14.04 LTS
libpng12-0 - 1.2.50-1ubuntu2.14.04.1
Ubuntu 12.04 LTS
libpng12-0 - 1.2.46-3ubuntu4.1

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