79 - Finger

The Finger service is a legacy network protocol that runs on TCP port 79. It provides information about users on a remote system, such as login names, full names, and idle times. While largely obsolete today, it was historically used for user lookup and communication, but it poses security risks because it can expose sensitive account information to unauthenticated remote users.

Enum

# List all users
finger @<target>

# List information about the target user
finger x7331@<target>

# Manual connection
nc <target> 79

finger-user-enum