OpenStack Image Registry and Delivery Service (Glance) Folsom, Grizzly before 2013.1.4, and Havana before 2013.2, when the download_image policy is configured, does not properly restrict access to cached images, which allows remote authenticated users to read otherwise restricted images via an image UUID.
https://launchpad.net/glance/+milestone/2013.2
https://launchpad.net/glance/+milestone/2013.1.4
http://www.ubuntu.com/usn/USN-2003-1
http://www.securityfocus.com/bid/63159
http://www.openwall.com/lists/oss-security/2013/10/16/9