The system could be made to expose sensitive information.
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.
3 November 2015
A security issue affects these releases of Ubuntu and its derivatives:
The system could be made to expose sensitive information.
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.
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 update you need to restart your session to make all the necessary changes.
Vulmon