It was discovered that gnome-screensaver did not correctly handle monitor hotplugging. An attacker with physical access could cause gnome-screensaver to crash and gain access to the locked session.
The problem can be corrected by updating your system to the following package versions:
10 February 2010
A security issue affects these releases of Ubuntu and its derivatives:
It was discovered that gnome-screensaver did not correctly handle monitor hotplugging. An attacker with physical access could cause gnome-screensaver to crash and gain access to the 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 upgrade you need to restart your session to effect the necessary changes.
Vulmon