GTK+ could be made to crash or run programs as your login if it processed a specially crafted image.
It was discovered that GTK+ incorrectly handled certain large images. A remote attacker could use this issue to cause GTK+ applications to crash, resulting in a denial of service, or possibly execute arbitrary code.
15 February 2016
A security issue affects these releases of Ubuntu and its derivatives:
GTK+ could be made to crash or run programs as your login if it processed a specially crafted image.
It was discovered that GTK+ incorrectly handled certain large images. A remote attacker could use this issue to cause GTK+ applications to crash, resulting in a denial of service, or possibly execute arbitrary code.
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.