Articles / Ubuntu: New GDM packages fi…

Ubuntu: New GDM packages fix security vulnerabilities

Henne Vogelsang discovered that under certain PolicyKit configurations, GDM could be made to launch a browser. A local attacker could exploit this to gain access to files with the privileges of the gdm user. PolicyKit is not configured in this manner in Ubuntu by default. Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1142-1
June 01, 2011

gdm vulnerability
==========================================================================

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

- Ubuntu 11.04

Summary:

GDM could be made to launch a browser and leak information about the system.

Software Description:
- gdm: GNOME Display Manager

Details:

Henne Vogelsang discovered that under certain PolicyKit configurations, GDM
could be made to launch a browser. A local attacker could exploit this to
gain access to files with the privileges of the gdm user. PolicyKit is not
configured in this manner in Ubuntu by default.

Update instructions:

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

Ubuntu 11.04:
 gdm                             2.32.1-0ubuntu3.2

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

References:
 CVE-2011-1709

Package Information:
 https://launchpad.net/ubuntu/+source/gdm/2.32.1-0ubuntu3.2
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