openstack-nova is vulnerable to authorization bypass attacks. The vulnerability exists as the XenAPI backend in OpenStack Compute (Nova) Folsom, Grizzly, and Havana before 2013.2 does not properly apply security groups (1) when resizing an image or (2) during live migration, which allows remote attackers to bypass intended restrictions.
www.openwall.com/lists/oss-security/2013/11/03/2
www.openwall.com/lists/oss-security/2013/11/03/3
access.redhat.com/security/updates/classification/#moderate
bugs.launchpad.net/nova/+bug/1073306
bugs.launchpad.net/nova/+bug/1202266
bugzilla.redhat.com/show_bug.cgi?id=1038239
rhn.redhat.com/errata/RHSA-2014-0366.html