The Pacemaker Resource Manager is a collection of technologies working together to provide data integrity and the ability to maintain application availability in the event of a failure. A flaw was found in the way pacemaker, a cluster resource manager, evaluated added nodes in certain situations. A user with read-only access could potentially assign any other existing roles to themselves and then add privileges to other users as well. This update also fixes the following bugs: * Due to a race condition, nodes that gracefully shut down occasionally had difficulty rejoining the cluster. As a consequence, nodes could come online and be shut down again immediately by the cluster. This bug has been fixed, and the shutdown attribute is now cleared properly. * Prior to this update, the pacemaker utility caused an unexpected termination of the attrd daemon after a system update to Red Hat Enterprise Linux 6.6. The bug has been fixed so that attrd no longer crashes when pacemaker starts. * Previously, the access control list of the pacemaker utility allowed a role assignment to the Cluster Information Base with a read-only permission. With this update, ACL is enforced and can no longer be bypassed by the user without the write permission, thus fixing this bug. * Prior to this update, the ClusterMon utility did not trigger an external agent script with the -E parameter to monitor the Cluster Information Base when the pacemaker utility was used. A patch has been provided to fix this bug, and crm_mon now calls the agent script when the -E parameter is used. Users of pacemaker are advised to upgrade to these updated packages, which contain backported patches to correct these issues.