USN-2475-1: GTK+ update

15 January 2015

gtk+3.0 update

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.

Software Description

  • 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.

Update instructions

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

Ubuntu 14.04 LTS
libgtk-3-0 - 3.10.8-0ubuntu1.4

To update your system, please follow these instructions:

After a standard system update you need to restart your session to make all the necessary changes.