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Etype EServ Passive Mode Denial of Service Vulnerability
by Nikola Strahija on January 31st, 2002 EType EServ is a combination Mail, News, Web, FTP and Proxy Server for Microsoft Windows 9x/NT/2000 systems. There is an exploitable denial of service vulnerability in EServ FTP server. It is possible to cause the server to stop accepting passive mode commands. This is accomplished by sending a large number of 'PASV' requests.
In the event that the affected service crashes, it will have to be restarted in order to regain normal functionality.
This vulnerability does not require any user authentication to exploit.
No exploit code is required.
Solution is to Etype Upgrade Eserv3123.