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[DNSOP] Re: Potentially interesting DNSSEC library CVE

Ted Lemon <mellon@fugue.com> Wed, 24 July 2024 16:23 UTC

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From: Ted Lemon <mellon@fugue.com>
Date: Wed, 24 Jul 2024 09:22:49 -0700
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To: Philip Homburg <pch-dnsop-5@u-1.phicoh.com>
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Subject: [DNSOP] Re: Potentially interesting DNSSEC library CVE
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Yet another reason to validate on the stub... :)

On Wed, Jul 24, 2024 at 8:37 AM Philip Homburg <pch-dnsop-5@u-1.phicoh.com>
wrote:

> > Partially. I believe the DNSSEC validation and following the
> > CNAME-chain have to be implemented in the same routine.  This is
> > because to perform an authenticated denial of existence, you first
> > need to know which name and rrtype you want to prove does not exist.
>
> DNSSEC validation follows the CNAME-chain that is part of validation.
>
> However, the ultimate user of the data also has to follow the CNAME-chain
> to avoid picking up unwanted additional records in the answer section.
>
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