[USN-1382-1] Light Display Manager vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Mon Mar 5 14:13:53 UTC 2012


==========================================================================
Ubuntu Security Notice USN-1382-1
March 05, 2012

lightdm vulnerability
==========================================================================

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

- Ubuntu 11.10

Summary:

Light Display Manager would allow unintended access to file descriptors.

Software Description:
- lightdm: Display Manager

Details:

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

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

References:
  http://www.ubuntu.com/usn/usn-1382-1
  https://launchpad.net/bugs/927060

Package Information:
  https://launchpad.net/ubuntu/+source/lightdm/1.0.6-0ubuntu1.4


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