IBM Tivoli Netcool/Webtop 2.1 before 2.1.0.5 preserves cached user privileges after logout, which allows physically proximate attackers to hijack a session by visiting an unattended workstation, as demonstrated by a root session that is still valid after a subsequent read-only session has begun.
https://exchange.xforce.ibmcloud.com/vulnerabilities/45419
http://www.vupen.com/english/advisories/2008/2690
http://www.securityfocus.com/bid/31414
http://www-1.ibm.com/support/docview.wss?uid=swg1IZ21888