The boot-from-volume feature in OpenStack Compute (Nova) Folsom and Essex, when using nova-volumes, allows remote authenticated users to boot from other users' volumes via a volume id in the block_device_mapping parameter.
https://github.com/openstack/nova/commit/317cc0af385536dee43ef2addad50a91357fc1ad
https://github.com/openstack/nova/commit/243d516cea9d3caa5a8267b12d2f577dcb24193b
https://exchange.xforce.ibmcloud.com/vulnerabilities/81697
https://bugzilla.redhat.com/show_bug.cgi?id=902629
https://bugs.launchpad.net/nova/+bug/1069904
http://www.ubuntu.com/usn/USN-1709-1
http://www.securityfocus.com/bid/57613
http://www.openwall.com/lists/oss-security/2013/01/29/9
http://secunia.com/advisories/51992
http://secunia.com/advisories/51963