IBM GINA, when used for OS/2 domain authentication of Windows NT users, allows local users to gain administrator privileges by changing the GroupMapping registry key.
https://exchange.xforce.ibmcloud.com/vulnerabilities/3166
http://www.securityfocus.com/bid/608
http://www.ntbugtraq.com/default.asp?pid=36&sid=1&A2=ind9908&L=ntbugtraq&F=&S=&P=5534