Directory traversal vulnerability in TwinFTP 1.0.3 R2 allows remote attackers to create arbitrary files via a .../ (triple dot) in the (1) CWD, (2) STOR, or (3) RETR commands.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17323
http://www.securityfocus.com/bid/11159
http://www.security.org.sg/vuln/twinftp103r2.html