OpenStack Identity (Keystone) before 2013.1 allows remote attackers to cause a denial of service (memory consumption and crash) via multiple long requests.
https://exchange.xforce.ibmcloud.com/vulnerabilities/84347
https://bugs.launchpad.net/keystone/+bug/1099025
https://bugs.launchpad.net/keystone/+bug/1098177
http://www.securityfocus.com/bid/59936
http://secunia.com/advisories/53397
http://lists.fedoraproject.org/pipermail/package-announce/2013-July/111914.html