Re: fingerd problems

> [ list of ways to list all the users on a system using fingerd ]

Another vulnerability of many finger daemons is their ability to support
'chain' fingers. If they are passed a "username" in the form of
'user_at_ahost.net' the finger daemon will repeat the finger, effectively
hiding the tracks of anyone trying to scope out your system security.

For a demonstration, 'telnet prep.ai.mit.edu 79' and type
'[yourname]@[yourhost]'. If you have TCP wrappers installed, you will
notice that the finger connection comes from prep.ai.mit.edu, not [yourhost].

Elliot Lee
Received on May 16 1996