Published: 13 September 2012
OpenStack Keystone 2012.1.3 does not invalidate existing tokens when granting or revoking roles, which allows remote authenticated users to retain the privileges of the revoked roles.
From the Ubuntu security team
Dolph Mathews discovered that when roles are granted and revoked to users in Keystone, pre-existing tokens were not updated or invalidated to take the new roles into account. An attacker could use this to continue to access resources that have been revoked.
2012.2~rc1-0ubuntu1 on 12.10 includes the fixes Keystone on 11.10 is a pre-release version and unusable with other components such as nova and horizon