OpenStack Identity (Keystone) Folsom 2012.2.4 and earlier, Grizzly before 2013.1.1, and Havana does not immediately revoke the authentication token when deleting a user through the Keystone v2 API, which allows remote authenticated users to retain access via the token.
https://exchange.xforce.ibmcloud.com/vulnerabilities/84135
http://www.securityfocus.com/bid/59787
http://www.openwall.com/lists/oss-security/2013/05/09/4
http://www.openwall.com/lists/oss-security/2013/05/09/3
http://secunia.com/advisories/53339
http://secunia.com/advisories/53326
http://lists.opensuse.org/opensuse-updates/2013-06/msg00085.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/106220.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105916.html