Red Hat Security Advisory 2013-0992-01 - Python-keystoneclient is the client library and command line utility for interacting with the OpenStack identity API. A flaw was found in the way python-keystoneclient handled encrypted data from memcached. Even when the memcache_security_strategy setting in "/etc/swift/proxy-server.conf" was set to ENCRYPT to help prevent tampering, an attacker on the local network, or possibly an unprivileged user in a virtual machine hosted on OpenStack, could use this flaw to bypass intended restrictions and modify data in memcached that will later be used by services utilizing python-keystoneclient.
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