Directory traversal vulnerability in Hyperion FTP server 2.8.1 allows remote attackers to read arbitrary files via a .. (dot dot) in the LS command.
http://www.mollensoft.com/news.htm
http://www.iss.net/security_center/static/10599.php
http://archives.neohapsis.com/archives/vulnwatch/2002-q4/0069.html