USN-1382-1: Light Display Manager vulnerability

5 March 2012

lightdm vulnerability

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

  • Ubuntu 11.10


Light Display Manager would allow unintended access to file descriptors.

Software Description

  • lightdm - Display Manager


Austin Clements discovered that Light Display Manager incorrectly leaked file descriptors to child processes. A local attacker can use this to bypass intended permissions and write to the log file, cause a denial of service, or possibly have another unknown impact.

Update instructions

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

Ubuntu 11.10
liblightdm-gobject-1-0 - 1.0.6-0ubuntu1.4
liblightdm-qt-1-0 - 1.0.6-0ubuntu1.4
lightdm - 1.0.6-0ubuntu1.4
lightdm-gtk-greeter - 1.0.6-0ubuntu1.4
lightdm-qt-greeter - 1.0.6-0ubuntu1.4

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.