source: http://www.securityfocus.com/bid/3838/info

EServ is a combination Mail, News, Web, FTP and Proxy Server for Microsoft Windows 9x/NT/2000 systems.

It is possible to construct a web request which is capable of accessing the contents of password protected files/folders on the webserver, such as the admin folder, which contains the administrative interface.

It should be noted that this vulnerability may only be exploited to access password-protected files in sub-folders of wwwroot. 

The following example will give the attacker access to the administrative interface:

http://host/./admin/