USN-2012-1: Light Display Manager vulnerability

6 November 2013

lightdm vulnerability

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

  • Ubuntu 13.10


Light Display Manager could be made to expose sensitive information locally.

Software Description

  • lightdm - Display Manager


Christian Prim discovered that Light Display Manager incorrectly applied the AppArmor security profile when the Guest account is used. A local attacker could use this issue to possibly gain access to sensitive information.

Update instructions

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

Ubuntu 13.10
lightdm - 1.8.4-0ubuntu1

To update your system, please follow these instructions:

This update uses a new upstream release, which includes additional bug fixes. After a standard system update you need to reboot your computer to make all the necessary changes.