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Date: Tue, 9 Dec 2014 08:16:20 +0100
From: Peter van Dijk <>
Subject: Re: PowerDNS Security Advisory 2014-02

Hello Hanno,

On 08 Dec 2014, at 23:26 , Hanno Böck <> wrote:

> Thanks for the info.
> Right now details on this vuln seem to be scarce. I asked myself some
> questions, but I don't know DNS internals very well.

These two articles from NLNetlabs and ISC might help, they are more verbose than ours:

I’m happy to answer followup questions.

> As this affects three implementations the obvious first question would
> be if others are affected, too. Has this been checked?

Somebody asked me to (help him) check djbdns today, which we’ll do. Any other implementations you are interested in? I have a lab setup for this issue so I’m happy to check.

> And is this only a DoS for the attacked server or would it also allow
> some completely new kind of DNS reflection attack (i.e. generating a
> loop where every loop iteration generates an UDP packet send to a
> victim)?

I’m convinced the loop could involve unwilling victims (unless they send responses that break the loop!), but I have not tried this in practice.

Kind regards,
Peter van Dijk
Netherlabs Computer Consulting BV -

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