openstack-keystone is vulnerable to authorization bypass attacks. The vulnerability exists as the (1) mamcache and (2) KVS token backends in OpenStack Identity (Keystone) Folsom 2012.2.x and Grizzly before 2013.1.4 do not properly compare the PKI token revocation list with PKI tokens, which allow remote attackers to bypass intended access restrictions via a revoked PKI token.
osvdb.org/97237
rhn.redhat.com/errata/RHSA-2013-1285.html
seclists.org/oss-sec/2013/q3/586
secunia.com/advisories/54706
www.ubuntu.com/usn/USN-2002-1
access.redhat.com/errata/RHSA-2013:1285
access.redhat.com/security/cve/CVE-2013-4294
access.redhat.com/security/updates/classification/#moderate
bugs.launchpad.net/keystone/+bug/1202952
bugzilla.redhat.com/show_bug.cgi?id=1004452
rhn.redhat.com/errata/RHSA-2013-1285.html