USN-2475-1: GTK+ update
15 January 2015
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
GTK+ improperly handled the menu key, possibly allowing lock screen bypass.
- gtk+3.0 - GTK+ graphical user interface library
Clemens Fries discovered that GTK+ allowed bypassing certain screen locks by using the menu key. An attacker with physical access could possibly use this flaw to gain access to a locked session.
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.