The GNOME Display Manager (GDM) provides the graphical login screen, shownshortly after boot up, log out, and when user-switching.A race condition flaw was found in the way GDM handled the cachedirectories used to store users' dmrc and face icon files. A local attackercould use this flaw to trick GDM into changing the ownership of anarbitrary file via a symbolic link attack, allowing them to escalate theirprivileges. (CVE-2011-0727)Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team forreporting this issue.All users should upgrade to these updated packages, which contain abackported patch to correct this issue. GDM must be restarted for thisupdate to take effect. Rebooting achieves this, but changing the runlevelfrom 5 to 3 and back to 5 also restarts GDM.