Sun Ray Server Software 4.1 on Solaris 10, when Automatic Multi-Group Hotdesking (AMGH) is enabled, responds to a logout action by immediately logging the user in again, which makes it easier for physically proximate attackers to obtain access to a session by going to an unattended DTU device.
http://sunsolve.sun.com/search/document.do?assetkey=1-66-268228-1
http://sunsolve.sun.com/search/document.do?assetkey=1-21-139548-03-1