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Date: Tue, 9 Dec 2014 09:30:50 +0100
From: Peter van Dijk <>
Subject: Re: PowerDNS Security Advisory 2014-02

Hello Hanno,

On 09 Dec 2014, at 9:22 , Hanno Böck <> wrote:

> On Tue, 9 Dec 2014 08:16:20 +0100
> Peter van Dijk <> wrote:
>> 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.
> I think dnsmasq would be interesting. Don't know which servers from the
> proprietary world may be worth investigating.

As far as I know, dnsmasq cannot actually recurse. Please let me know if I’m wrong, and I’ll test it.

>> 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.
> However that would be very interesting to know. DNS reflection attacks
> are a big thing, if they could be amplified with a loop on the resolver
> that'd almost certainly boost this issue to a whole new level.

 I may test this later :)

Kind regards,
Peter van Dijk
Netherlabs Computer Consulting BV -

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