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
www.ubuntu.com/usn/USN-2002-1
access.redhat.com/errata/RHSA-2013:1285
access.redhat.com/security/cve/CVE-2013-4294
bugs.launchpad.net/keystone/+bug/1202952
bugzilla.redhat.com/show_bug.cgi?id=1004452
nvd.nist.gov/vuln/detail/CVE-2013-4294
opendev.org/openstack/keystone