full-disclosure - Re: Ubisoft DDoS

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Message-ID: <17456.1268147544@localhost>
Date: Tue, 09 Mar 2010 10:12:24 -0500
From: Valdis.Kletnieks@...edu
To: Adrenalin <adrenalinup@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Ubisoft DDoS

On Tue, 09 Mar 2010 15:27:02 +0100, Adrenalin said:
> I'm just wondering, even if it's under DDoS, isn't it as easy to block as to
> collect the list of IP that send too much data, and just block them on the
> upper level ISP ?

You *do* realize that a *small* botnet these days is 75,000 machines, and
there's a estimated 140 million compromised zombie boxes out there? There's
very few boxes that can handle an inbound ACL of 75K entries sanely - usually
what ends up happening is the upstream drops all traffic *to* the target node
just so all the *other* boxes at the site still get some bandwidth.

And "sending too much data" is hard to quantify - if you have enough bots,
you can thoroughly DDoS a site using far *less* bandwidth per host than a
normal user does.  If the site was designed to handle 10,000 clients each
sending 5 packets per second for 10 seconds during a login at game start,
it will likely fall over if you throw 100,000 bots at it, each sending
4 packets a second continuously...

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