Thierry Carrez <thierry> reports:

Pádraig Brady from Red Hat discovered that the fix implemented for
CVE-2012-3361 (OSSA-2012-008) was not covering all attack scenarios. By
crafting a malicious image with root-readable-only symlinks and
requesting a server based on it, an authenticated user could still
corrupt arbitrary files (all setups affected) or inject arbitrary files
(Essex and later setups with OpenStack API enabled and a libvirt-based
hypervisor) on the host filesystem, potentially resulting in full
compromise of that compute node.