FTP

The File Transfer Protocol is a standard communication protocol used for the transfer of computer files from a server to a client on a computer network. FTP is built on a client–server model architect

Default port: 21

Enum

nmap $IP -p 21 -sV -O

Bruteforce with Hydra

hydra -L /usr/share/metasploit-framework/data/wordlists/unix_users.txt -P /usr/share/metasploit-framework/data/wordlists/unix_passwords.txt $IP ftp

Bruteforce with Nmap

nmap $IP --script ftp-brute --script-args userdb=/path/to/users -p 21

Anonymous Login

nmap $IP --script ftp-anon