Vsftpd 2.0.8 - Exploit

Connect to FTP and send the magic username:

Version 2.0.8 does not contain this malicious code, as the backdoor was injected into source archives much later, in July 2011. vsftpd 2.0.8 exploit

Versions in the 2.0.x branch, including 2.0.8, may remain vulnerable to a memory consumption DoS if the deny_file option is enabled in vsftpd.conf . Attackers can send a large number of CWD (Change Working Directory) commands to exhaust server memory. Connect to FTP and send the magic username: Version 2

At this point, the server silently opens a shell on a high port. At this point, the server silently opens a

For a practical guide on version 2.0.8, the Stapler CTF Walkthrough on Medium explains how attackers often use FTP enumeration to find sensitive information rather than a direct software exploit. Key Vulnerabilities Often Confused with 2.0.8 CVE-2011-2523 Detail - NVD

To detect and prevent exploitation of this vulnerability: