Articles / Ubuntu: New Light Display M…

Ubuntu: New Light Display Manager packages fix security vulnerabilities

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. Updated packages are available from security.ubuntu.com.

==========================================================================
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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