bugtraq - Re: recursive DNS servers DDoS as a growing DDoS problem

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Message-ID: <442C8575.5010309@qut.edu.au>
Date: Fri, 31 Mar 2006 11:27:17 +1000
From: Paul Stepowski <p.stepowski@....edu.au>
To: bugtraq@...urityfocus.com
Subject: Re: recursive DNS servers DDoS as a growing DDoS problem

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Stephen Samuel wrote:
| To put it another way: UDP as a purely connectionless
| protocol is fast becoming a liability in situations where
| significant amplification is possible.

My thoughts exactly.  This attack is possible because of a design limitation of
UDP (and other connectionless protocols).  I realise that DNS is receiving
attention because of it's ubiquity on the Internet, but this type of attack can
leverage any service that responds with a reply packet larger than the initial
query packet where the protocol used is connectionless.  TCP/IP is showing it's
age (again).

Thanks,

Paul
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