source: http://www.securityfocus.com/bid/18279/info

ESTsoft InternetDisk is prone to an arbitrary file-upload and script-execution vulnerability. 

An attacker can exploit this vulnerability to upload arbitrary code and execute it in the context of the webserver process. This may facilitate unauthorized access or privilege escalation; other attacks are also possible. 

This issue affects versions of InternetDisk downloaded prior to 19 April, 2006.

The following URI will demonstrate a filename that attackers may use to exploit this issue:
http://www.example.com/WebLink/yourid/somephpcode.php.kr