Resources consumption in 602 Lan Suite 2004.0.04.0909

Type securityvulns
Reporter Securityvulns
Modified 2004-11-08T00:00:00


                         Luigi Auriemma

Application: 602 Lan Suite Versions: <= 2004.0.04.0909 Platforms: Windows Bugs: A] resources consumption through webmail B] sockets consuption through telnet proxy loop Exploitation: remote Date: 06 November 2004 Author: Luigi Auriemma e-mail: web:

1) Introduction 2) Bugs 3) The Code 4) Fix

=============== 1) Introduction ===============

602 Lan Suite is an all-in-one HTTP, FTP, telnet, SOCKS and RealAudio proxy server providing also webmail, SMTP and POP services.

======= 2) Bugs =======

A] resources consumption through webmail

The webmail service (/mail) can be used by an attacker to consume CPU and memory of the remote server. That happens through the usage of the POST request with a Content-Length value containing the desired amount of memory to eat and the subsequent closing of the connection without the need of sending the specified data. The duration of the effect of each malformed request depends by the amount of data specified.

B] sockets consuption through telnet proxy loop

The telnet proxy is vulnerable to a loopback attack, practically it correctly avoids that users request to connect to the IP but the same filter is not applied to the other network interfaces of the server, so an attacker can force the server to connect to its same local IP addresses consuming all its sockets.

=========== 3) The Code ===========

====== 4) Fix ======

Version 2004.0.04.1104.

Luigi Auriemma