gnome-screensaver is the GNOME project's official screen saver program.
A flaw was found in the way gnome-screensaver verified user passwords. When a system used a remote directory service for login credentials, a local attacker able to cause a network outage could cause gnome-screensaver to crash, unlocking the screen. (CVE-2008-0887)
Users of gnome-screensaver should upgrade to this updated package, which contains a backported patch to correct this issue.