This bug has been copied from bug #596887 and has been proposed to be backported to 5.5 z-stream (EUS).
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: ksu used to perform PAM account and session management for the target user after switching to the privileges of the target user. As a result, if that user did not have sufficient privileges, some modules would not function properly.This update performs PAM account and session management before assuming the privileges of the target user.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2010-0560.html