(RHSA-2010:0657) Low: gdm security and bug fix update

The GNOME Display Manager (GDM) is a configurable re-implementation of XDM,
the X Display Manager. GDM allows you to log in to your system with the X
Window System running, and supports running several different X sessions on
your local machine at the same time.

A flaw was found in the way the gdm package was built. The gdm package was
missing TCP wrappers support on 64-bit platforms, which could result in an
administrator believing they had access restrictions enabled when they did
not. (CVE-2007-5079)

This update also fixes the following bug:

• sometimes the system would hang instead of properly shutting down when
  a user chose “Shut down” from the login screen. (BZ#625818)

All users should upgrade to this updated package, which contains backported
patches to correct these issues. GDM must be restarted for this update to
take effect. Rebooting achieves this, but changing the runlevel from 5 to 3
and back to 5 also restarts GDM.