python-keystoneclient before 0.2.4, as used in OpenStack Keystone (Folsom), does not properly check expiry for PKI tokens, which allows remote authenticated users to (1) retain use of a token after it has expired, or (2) use a revoked token once it expires.
lists.opensuse.org/opensuse-updates/2013-06/msg00198.html
rhn.redhat.com/errata/RHSA-2013-0944.html
www.openwall.com/lists/oss-security/2013/05/28/7
www.ubuntu.com/usn/USN-1851-1
www.ubuntu.com/usn/USN-1875-1
access.redhat.com/errata/RHSA-2013:0944
access.redhat.com/security/cve/CVE-2013-2104
bugs.launchpad.net/python-keystoneclient/+bug/1179615
bugzilla.redhat.com/show_bug.cgi?id=965852
nvd.nist.gov/vuln/detail/CVE-2013-2104