=========================================================================Ubuntu Security Notice USN-2475-1
January 15, 2015

gtk+3.0 update
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

GTK+ improperly handled the menu key, possibly allowing lock screen bypass.

Software Description:
- gtk+3.0: GTK+ graphical user interface library

Details:

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

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

References:
  https://ubuntu.com/security/notices/USN-2475-1
  https://launchpad.net/bugs/1366790

Package Information:
  https://launchpad.net/ubuntu/+source/gtk+3.0/3.10.8-0ubuntu1.4