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Re: DNS Cache Dan Kamikaze (Actual Exploit Discussion)
From: Mark Andrews <Mark_Andrews () isc org>
Date: Wed, 16 Jul 2008 12:12:58 +1000

--On July 16, 2008 11:17:07 AM +1000 Mark Andrews <Mark_Andrews () isc org>=20

The real problem isn't signing or resigning zones, or even
successfully=3D20 completing the original configuration (although those
are not trivial for=3D20 the average person trying to setup their own
dns).  It's the trust=3D20 anchors.  Until the root is signed, trust
anchors are a PITA.  And until=3D20 the root is signed, why should =
believe that DNSSEC will achieve=3D20 wide adoption?

    Well there are a number of ccTLD's that are already signed.
    RIPE sign their part of the reverse space.  ORG is in the
    process of getting signed.  It's happening.

    There are existing solutions to dealing with lack of support
    in the infrastructure zones (includes the root).  You let
    someone you trust collect the trust anchors for you then
    incorporate them on a regular basis.

    We effectively do this everyday with https but for some
    reason people are scared to do the same thing with dns
    despite private parts of the keys never being available to
    the entity doing the certification.  With https the certifying
    authority can spoof any site they certify.

Perhaps that's because a cert problem on a web server breaks a single=20
webserver.  A cert problem with dns breaks an entire domain.

        And a signed root changes that how?  You either add your
        trust anchor to a reposititory or to the parent zone.  You
        still need to re-sign regularly.  You still have the same
        amount of communication to do when you roll over your keys.

        B.T.W. DNSSEC problems are easier to chase down than a
        broken delegation.  I've done both.  Neither requires more
        than "dig" and "date".

        If you are really worried about validation failing you can
        always disable it but please sign the zones so that those
        of us who would like to be able to use DNSSEC to validate
        DNS data have something to work with.
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews () isc org

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