> On Feb 24, 2019, at 9:20 PM, Bill Woodcock <[email protected]> wrote: > > > >> On Feb 24, 2019, at 7:41 PM, Montgomery, Douglas (Fed) <[email protected]> >> wrote: >> In the 3rd attack noted below, do we know if the CA that issued the DV CERTS >> does DNSSEC validation on its DNS challenge queries? > > We know that neither Comodo nor Let's Encrypt were DNSSEC validating before > issuing certs. The Let’s Encrypt guys at least seemed interested in learning > from their mistake. Can’t say as much of Comodo.
Sorry, a correction:
Apparently Let’s Encrypt _does_ do a DNSSEC validation check, and presumably
that’s why a Comodo cert was used to attack us. It was my prior understanding
that Let’s Encrypt certs had been used against DNSSEC-signed zones, but
apparently that was not the case.
My apologies for my confusion. Nonetheless, even with the DNSSEC validation,
there’s a problem here that needs to be solved, on both the parts of the CAs
involved and the registry/registrar chain.
-Bill
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