Format string vulnerability in ProFTPD 1.2.0rc2 may allow attackers to execute arbitrary commands by shutting down the FTP server while using a malformed working directory (cwd).
https://exchange.xforce.ibmcloud.com/vulnerabilities/6433
http://www.linux-mandrake.com/en/security/2001/MDKSA-2001-021.php3
http://www.debian.org/security/2001/dsa-029
http://marc.info/?l=bugtraq&m=97916525715657&w=2
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000380
http://archives.neohapsis.com/archives/bugtraq/2001-02/0117.html