NCP Network Communication Secure Client 8.11 Build 146, and possibly other versions, allows local users to bypass security protections and configure privileged options via a long argument to ncpmon.exe, which provides access to alternate privileged menus, possibly due to a buffer overflow.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25243
http://www.securityfocus.com/bid/16906
http://www.securityfocus.com/archive/1/426480/100/0/threaded
http://secunia.com/advisories/19082
http://lists.grok.org.uk/pipermail/full-disclosure/2006-March/042640.html