XDM in XFree86 opens a chooserFd TCP socket even when DisplayManager.requestPort is 0, which could allow remote attackers to connect to the port, in violation of the intended restrictions.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10161
https://exchange.xforce.ibmcloud.com/vulnerabilities/16264
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=124900
http://www.securityfocus.com/bid/10423
http://www.redhat.com/support/errata/RHSA-2004-478.html
http://www.openbsd.org/errata.html#xdm
http://www.mandrakesecure.net/en/advisories/advisory.php?name=MDKSA-2004:073
http://www.gentoo.org/security/en/glsa/glsa-200407-05.xml
http://www.ciac.org/ciac/bulletins/p-001.shtml
http://securitytracker.com/id?1010306