USN-2789-1: XScreenSaver vulnerability

3 November 2015

xscreensaver vulnerability

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

  • Ubuntu 12.04 LTS


The system could be made to expose sensitive information.

Software Description

  • xscreensaver - Automatic screensaver for X


It was discovered that XScreenSaver incorrectly handled unplugging an external monitor. An attacker with physical access could 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 12.04 LTS
xscreensaver - 5.15-2ubuntu1.1

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.