Date: Tue, 9 Dec 2014 08:16:20 +0100 From: Peter van Dijk <peter.van.dijk@...herlabs.nl> To: oss-security@...ts.openwall.com Subject: Re: PowerDNS Security Advisory 2014-02 Hello Hanno, On 08 Dec 2014, at 23:26 , Hanno Böck <hanno@...eck.de> 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: http://www.unbound.net/downloads/CVE-2014-8602.txt https://kb.isc.org/article/AA-01216 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 - http://www.netherlabs.nl/ Download attachment "signature.asc" of type "application/pgp-signature" (842 bytes)
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