The Red Hat build script for the GNOME Display Manager (GDM) before 2.16.0-56 on Red Hat Enterprise Linux (RHEL) 5 omits TCP Wrapper support, which might allow remote attackers to bypass intended access restrictions via XDMCP connections, a different vulnerability than CVE-2007-5079.
https://rhn.redhat.com/errata/RHSA-2009-1364.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9586
https://bugzilla.redhat.com/show_bug.cgi?id=239818