From: Omar A. Herrera (omar.herrera@oissg.org)
Date: Sat Sep 03 2005 - 00:00:56 EDT
Hi Kuyffya,
> -----Original Message-----
> From: kuffya@gmail.com [mailto:kuffya@gmail.com]
>
> Hi list,
> I've used a variety of tools such as Nemesis, Packet Xcalibur & Libnet GUI
> to craft customized packets. Using such tools, you can create packets at
> layers 2 up to 5 possibly spoofing your source IP, port numbers or
> whatever you see fit.
> The question is : Would it be possible to craft a HTTP request(or multiple
> requests) using a spoofed IP address? I'm inclined to consider that it's
> not, the reason being you must have a 3-way handshake established before
> you can start talking application layer protocols (such as HTTP). If you
> use a spoofed IP address, then there's no way of doing that. On the other
> hand, I might be totally wrong, that's why I'm asking the list, for the
> list is wise.
> If, however, it is possible could you please give me some directions on
> how to do it?
Yes you can, it is not easy though. The theory of this attacks is old
actually, they are called blind attacks, and you should be careful with 3
things: a) that the spoofed address does not respond and b) that the timing
of your responses is adequate c) You need to have some way to capture their
responses, in order to keep up with the sequence numbers of packets and
other stuff.
For example, if a hacker manages to compromise a router at their target's
perimeter, she/he would be in a good position to accomplish this.
Regards,
Omar Herrera
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