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Ubuntu Security Notice USN-1399-2
March 13, 2012

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

- Ubuntu 11.10

Summary:

Light Display Manager could be made to delete files as the administrator.

Software Description:
- lightdm: Display Manager

Details:

Ryan Lortie discovered that a guest session script bundled in the Light
Display Manager package improperly cleaned out certain guest session files.
A local attacker could use this issue to delete arbitrary files.

Update instructions:

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

Ubuntu 11.10:
  lightdm                         1.0.6-0ubuntu1.6

In general, a standard system update will make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-1399-2
  http://www.ubuntu.com/usn/usn-1399-1
  CVE-2012-0943

Package Information:
  https://launchpad.net/ubuntu/+source/lightdm/1.0.6-0ubuntu1.6