OpenStack Compute (Nova) Grizzly, Folsom (2012.2), and Essex (2012.1) does not properly implement a quota for fixed IPs, which allows remote authenticated users to cause a denial of service (resource exhaustion and failure to spawn new instances) via a large number of calls to the addFixedIp function.
https://review.openstack.org/#/c/24453/
https://review.openstack.org/#/c/24452/
https://review.openstack.org/#/c/24451/
https://lists.launchpad.net/openstack/msg21892.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/82877
https://bugzilla.redhat.com/show_bug.cgi?id=919648
https://bugs.launchpad.net/nova/+bug/1125468
http://www.securityfocus.com/bid/58492
http://www.openwall.com/lists/oss-security/2013/03/14/18
http://ubuntu.com/usn/usn-1771-1
http://secunia.com/advisories/52728
http://secunia.com/advisories/52580