bugtraq - Re: A new TCP/IP blind data injection technique?

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Date: Fri, 12 Dec 2003 17:09:35 -0500
From: Jeff Kell <jeff-kell@....edu>
To: bugtraq@...urityfocus.com, full-disclosure@...sys.com
Subject: Re: A new TCP/IP blind data injection technique?

Stephen Frost wrote:

>>      As such, there seems to be a reason for some concern, even with
>>      random IP IDs, since it only takes one RFC-ignorant party for the
>>      attack against a session to succeed.
> 
> 
> Is it possible the RSTs you're seeing are from firewalls which send an
> RST due to rules in the firewall?  It could be that those 12 hosts
> wouldn't actually accept a connection where the SYN packet has a zero
> TCP checksum. 

Many switches will not forward incorrect checksums.  NAT devices 
recalculate checksums.  Your mileage may vary.

Jeff

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