libpng could be made to crash or run programs as your login if it opened a specially crafted file.
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)
19 November 2015
A security issue affects these releases of Ubuntu and its derivatives:
libpng could be made to crash or run programs as your login if it opened a specially crafted file.
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)
The problem can be corrected by updating your system to the following package versions:
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.
Vulmon