Directory traversal vulnerability in FreshWebMaster Fresh FTP 5.36, 5.37, and possibly earlier, allows remote FTP servers to write arbitrary files via a "..\" (dot dot backslash) in a filename. NOTE: some of these details are obtained from third party information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/62555
http://www.securityfocus.com/bid/44072
http://www.securityfocus.com/archive/1/514259/100/0/threaded
http://www.htbridge.ch/advisory/directory_traversal_vulnerability_in_freshftp.html
http://secunia.com/advisories/41798
http://packetstormsecurity.org/1010-exploits/freshftp-traversal.txt