USN-2012-1: Light Display Manager vulnerability

Ubuntu Security Notice USN-2012-1

6th 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

Update instructions

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

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.