Session fixation vulnerability in OpenStack Dashboard (Horizon) folsom-1 and 2012.1 allows remote attackers to hijack web sessions via the sessionid cookie.
https://exchange.xforce.ibmcloud.com/vulnerabilities/75423
https://bugs.launchpad.net/horizon/+bug/978896
http://www.securityfocus.com/bid/53399
http://www.openwall.com/lists/oss-security/2012/05/05/1
http://ubuntu.com/usn/usn-1439-1
http://secunia.com/advisories/49071
http://secunia.com/advisories/49024
http://lists.fedoraproject.org/pipermail/package-announce/2012-May/081173.html