Re: DDos within a pentest

[Jose Maria Lopez Hernandez <jkerouac () bgsec com>]

El vie, 06-05-2005 a las 09:44 +0200, Julian Totzek escribió:
> Hi group,
>
> within a pentest we trying to offer the possibility of a DDos Foold for our customers. I know there are many tools to 
> do a flood from a single PC, but all of these tools just send as many syn's as the can. Does anybody know a tool 
> where I'm able to limit the bandwidth? I don’t want to get a bandwidth overload, I just want to show that the server 
> is not able to handle all the syn packets.
>
> An other question is from where would I start such a attack? We only have a 2Mbit line here in the office, so if I 
> need to flood a 10Mbit line there will not be enough packets to do this, right? Maybe there is a provider out there 
> who already offers this service!
>
> The third question is what will be the side effects if I send packets with spoofed sources? As you all know I don't a 
> answer to my packets, but would it be a DDos to all spoofed sources then? How can you ensure that only the main 
> target is getting flooded?
>
>
> Best regards
>
> Julian Totzek
>
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A good way to simulate a Ddos attack, and above all if you care about
an overwhelming amount of SYN connections, is to install a P2P client
in the target machine. You just put a lot (30 or 40) of the most popular
files in the queue, configure the P2P to have a lot of sources for each
file, and you are done... thousands of machines will make connections
to you and from you. It's a poor man Ddos tool.

I've been working a lot to block the P2P's in the enterprise, and now
I have found they are useful for something. That's odd...

Regards.

-- 

Jose Maria Lopez Hernandez
Director Tecnico de bgSEC
jkerouac () bgsec com
bgSEC Seguridad y Consultoria de Sistemas
http://www.bgsec.com
ESPAÑA

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