The VMWare driver in OpenStack Compute (Nova) 2013.2 through 2013.2.2 does not properly put VMs into RESCUE status, which allows remote authenticated users to bypass the quota limit and cause a denial of service (resource consumption) by requesting the VM be put into rescue and then deleting the image.
https://bugs.launchpad.net/nova/+bug/1269418
http://www.openwall.com/lists/oss-security/2014/03/21/2