N/A - USN-2184-2

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

The Unity lock screen could be bypassed.

Software Description: - unity: Interface designed for efficiency of space and interaction.

Details:

USN-2184-1 fixed lock screen vulnerabilities in Unity. Further testing has uncovered more issues which have been fixed in this update. This update also fixes a regression with the shutdown dialogue.

We apologize for the inconvenience.

Original advisory details:

Frédéric Bardy discovered that Unity incorrectly filtered keyboard
shortcuts when the screen was locked. A local attacker could possibly use
this issue to run commands, and unlock the current session.
Giovanni Mellini discovered that Unity could display the Dash in certain
conditions when the screen was locked. A local attacker could possibly use
this issue to run commands, and unlock the current session.

Update instructions:

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

Ubuntu 14.04 LTS:
unity 7.2.0+14.04.20140423-0ubuntu1.2

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

References:
http://www.ubuntu.com/usn/usn-2184-2
http://www.ubuntu.com/usn/usn-2184-1
https://launchpad.net/bugs/1314247

Package Information:
https://launchpad.net/ubuntu/+source/unity/7.2.0+14.04.20140423-0ubuntu1.2