Directory traversal vulnerability in the FTP client in Serengeti Systems Incorporated Robo-FTP 3.7.3, and probably other versions before 3.7.5, allows remote FTP servers to write arbitrary files via a .. (dot dot) in a filename in a server response.
https://exchange.xforce.ibmcloud.com/vulnerabilities/62548
http://www.securityfocus.com/bid/44073
http://www.securityfocus.com/archive/1/514267/100/0/threaded
http://www.htbridge.ch/advisory/directory_traversal_vulnerability_in_robo_ftp.html