ctf flag port25 Port 25 - smtp Nmap nmap -p 25 -sV -sC -Pn 192.168.0.102
...
25/tcp open smtp Postfix smtpd
...
Enumeration - Telnet > telnet 10.0.2.5 25
> VRFY root
< 252 2.0.0 root
> VRFY szalek
< 550 5.1.1 <szalek>: Recipient address rejected: User unknown in local recipient table
> VRFY admin
< 550 5.1.1 <admin>: Recipient address rejected: User unknown in local recipient table
> VRFY user
< 252 2.0.0 user
Enumeration - smtp-user-enum smtp-user-enum -M VRFY -U /usr/share/wordlists/seclists/Usernames/xato-net-10-million-usernames.txt -t $(target)
smtp-user-enum -M EXPN -U /usr/share/wordlists/seclists/Usernames/xato-net-10-million-usernames.txt -t $(target)
smtp-user-enum -M RCPT -U /usr/share/wordlists/seclists/Usernames/xato-net-10-million-usernames.txt -t $(target)
smtp-user-enum -M EXPN -U /usr/share/wordlists/seclists/Usernames/xato-net-10-million-usernames.txt -t $(target)
use auxiliary/scanner/smtp/smtp_enum
msf auxiliary(smtp_enum) > set rhosts 10.10.200.211
msf auxiliary(smtp_enum) > set rport 25
msf auxiliary(smtp_enum) > set USER_FILE /tmp/users.txt
msf auxiliary(smtp_enum) > run