Re: [Full-disclosure] DNS Cache Dan Kamikaze (Actual Exploit Discussion)

--On July 16, 2008 11:17:07 AM +1000 Mark Andrews <Mark_Andrews@xxxxxxx>=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@xxxxxxx

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