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.
