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Etype EServ Bounce Attack Vulnerability

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

EServ is prone to FTP bounce attacks. An attacker who logs in to the FTP server may use the PORT command to connect to an arbitrary port on a remote host. As a result, the attacker may use the FTP server as a proxy.