Re: How to bypass firewalls

[danuxx () gmail com]

Not an expert on this topic but I know a common way to do so by taking advantage of protocols behaviour and stateful 
inspection design.

So let's say that the firewall has stateful inspection for ftp and IRC protocols, you can inject ftp PORT commands 
during ftp sessions to fool the firewall into thinking that it is an IRC transaction and since this protocol uses peer 
to peer connections the firewall will automatically open any port needed by the IRC server(attacker) to the chat client 
(victim).

Although this flaw has been patched by Netfilter team, definitely constitutes a sexy way to bypass firewalls.

Google "phrack breaking through a firewall".
Sent via BlackBerry from Danux Network

-----Original Message-----
From: Raja <raja1.it.consultant () gmail com>
Date: Thu, 06 May 2010 09:32:35 
To: <security-basics () securityfocus com>
Subject: How to bypass firewalls

Hi,

Can anybody let me know the available methods for bypassing firewall for 
all kinds of traffic?

Thanks,
Raja

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