USN-1950-1: Light Display Manager vulnerability

12 September 2013

lightdm vulnerability

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

  • Ubuntu 13.04


Light Display Manager could be made to expose sensitive information.

Software Description

  • lightdm - Display Manager


It was discovered that Light Display Manager created .Xauthority files with incorrect permissions. A local attacker could use this flaw to bypass access restrictions.

Update instructions

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

Ubuntu 13.04
lightdm - 1.6.0-0ubuntu3.1

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.