Date: Tue, 22 Jul 2008 09:39:20 -0700 From: Doug Barton <dougb@FreeBSD.org> To: cpghost <cpghost@cordula.ws> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: FreeBSD 7.1 and BIND exploit Message-ID: <48860D38.6060209@FreeBSD.org> In-Reply-To: <20080722160542.GA14592@epia-2.farid-hajji.net> References: <200807212219.QAA01486@lariat.net> <200807221552.m6MFqgpm009488@lurza.secnetix.de> <20080722160542.GA14592@epia-2.farid-hajji.net>
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cpghost wrote:
> Yes indeed. If I understand all this correctly, it's because the
> transaction ID that has to be sent back is only 2 bytes long,
2 bits, 16 bytes.
> and if the query port doesn't change as well with every query, that
> can be cracked in milliseconds: sending 65536 DNS queries to a
> constant port is just way too easy! The namespace is way too small,
> and there's no way to fix this by switching to, say, 4 bytes or
> even more for the transaction ID without breaking existing
> resolvers; actually without breaking the protocol itself.
That's more or less accurate, yes.
Doug
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