smss.exe debugging subsystem in Windows NT and Windows 2000 does not properly authenticate programs that connect to other programs, which allows local users to gain administrator or SYSTEM privileges by duplicating a handle to a privileged process, as demonstrated by DebPloit.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A76
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A158
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-024
http://www.securityfocus.com/bid/4287
http://www.securityfocus.com/archive/1/264927
http://www.securityfocus.com/archive/1/264441