Ubuntu Security Notice 1950-1 - It was discovered that Light Display Manager created .Xauthority files with incorrect permissions. A local attacker could use this flaw to bypass access restrictions.
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Ubuntu Security Notice USN-1950-1
September 12, 2013
lightdm vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 13.04
Summary:
Light Display Manager could be made to expose sensitive information.
Software Description:
- lightdm: Display Manager
Details:
It was discovered that Light Display Manager created .Xauthority files with
incorrect permissions. A local attacker could use this flaw to bypass
access restrictions.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 13.04:
lightdm 1.6.0-0ubuntu3.1
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1950-1
CVE-2013-4331
Package Information:
https://launchpad.net/ubuntu/+source/lightdm/1.6.0-0ubuntu3.1