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In July 2011, an unknown attacker compromised the official vsftpd download mirror and replaced the legitimate vsftpd-2.3.4.tar.gz archive with a version containing a hidden backdoor.
Today, the "vsftpd 2.0.8 exploit" is a staple in penetration testing courses (like OSCP) and Capture The Flag (CTF) challenges. If you search for this exploit on GitHub, you will find multiple repositories offering Python, Ruby, and Metasploit modules. This article explains the vulnerability, how the exploit works, and—for educational purposes—how to install and run it from GitHub.
The backdoor listener should now be open on port 6200: nc 6200 0;2a; Method 2: Metasploit Framework 0;16; 0;145;0;8f1;
A malicious backdoor was intentionally added to the source code of version 2.3.4 between June 30 and July 1, 2011. How the Exploit Works
This historical case highlights why supply chain security matters. Always: