Re: Tool to find hidden web proxy server

[Miles Stevenson <miles () mstevenson org>]

Hello Vinay,

 I take this to mean that you believe you have an unauthorized webproxy on 
your network that is not running on port 80 and you are trying to hunt it 
down? Do you not have egress firewall filtering to block unauthorized ports 
going outbound? 

In any case, here is something you can do to find HTTP traffic on your network 
that is not running on port 80:

1) Set up an IDS sensor that can see all the traffic on your network. 
Prefferably a Unix/Linux box.

2) Download and install ngrep at http://ngrep.sourceforge.net

3) Use the following ngrep command to search for HTTP traffic that is not 
running over port 80:

ngrep 'HTTP\/1\.1' tcp port not 80 

Please note that depending on the amount of traffic on your network and the 
speed of your IDS machine, this could be too much data for ngrep to sift 
through in real time. As an alternative, you can capture a binary tcpdump and 
have ngrep process this at a later time.

Good luck.

On Wednesday 01 September 2004 07:26 am, vinay mangal wrote:
> Dear all,
>
> I am looking for a tool to find the hidden web proxy server in my local
> network.
>
> Any hint will be useful.
>
> with regards
> Vinay
>
>
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Miles Stevenson
miles () mstevenson org
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