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Ubuntu Security Notice USN-2012-1
November 06, 2013

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

- Ubuntu 13.10

Summary:

Light Display Manager could be made to expose sensitive information
locally.

Software Description:
- lightdm: Display Manager

Details:

Christian Prim discovered that Light Display Manager incorrectly applied
the AppArmor security profile when the Guest account is used. A local
attacker could use this issue to possibly gain access to sensitive
information.

Update instructions:

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

Ubuntu 13.10:
  lightdm                         1.8.4-0ubuntu1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to reboot your computer to
make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-2012-1
  CVE-2013-4459

Package Information:
  https://launchpad.net/ubuntu/+source/lightdm/1.8.4-0ubuntu1