On 09/09/17 10:21, Jeremy Rowley wrote:
> Certificate 1 contains a single DNS identifier for
> big.basic.caatestsuite.com <http://big.basic.caatestsuite.com> .  This DNS
> name has a CAA resource record set that is too large to fit within a single
> DNS UDP packet, but small enough to fit within a DNS TCP packet.  The only
> CAA record containing an issue property is:
> 
> big.basic.caatestsuite.com <http://big.basic.caatestsuite.com> .     IN
> CAA     0 issue "caatestsuite.com <http://caatestsuite.com> "
> 
> Therefore, only caatestsuite.com <http://caatestsuite.com>  is allowed to
> issue for this identifier.

>From the discussion so far, I'd say that this one is clearly a
misissuance, and needs treating as one. (I see this as a clever vuln,
not as CA implementation incompetence.)

The jury is still out on the CNAME and DNSSEC-based reports.

Gerv

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