Directory traversal vulnerability in AspUpload 2.1, in certain configurations, allows remote attackers to upload and read arbitrary files, and list arbitrary directories, via a .. (dot dot) in the Filename parameter in (1) UploadScript11.asp or (2) DirectoryListing.asp.
http://www.securityfocus.com/bid/3608
http://www.iss.net/security_center/static/7629.php