Re: [Uta] MTA-STS-03 review
Viktor Dukhovni <ietf-dane@dukhovni.org> Tue, 04 April 2017 18:21 UTC
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Date: Tue, 04 Apr 2017 18:21:23 +0000
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Subject: Re: [Uta] MTA-STS-03 review
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On Tue, Apr 04, 2017 at 04:20:59PM +0200, Daniel Margolis wrote: > Can you explain a little more what you mean? The mitigation is to publish a > new policy with the correct values, so certainly anyone who does so > pre-emptively is not likely to fall victim to a DoS attack. More > specifically, anyone who is _aware_ of this risk should simply ensure > untrusted individuals cannot publish content with a certificate for *. > example.com on "mta-sts.example.com"; the risk is for domains like (say) > tumblr.com who may inadvertently allow that. I too found the text in question confusing. It makes no mention the attacker is presumed able to obtain certificates for "mta-sts.example.com", but otherwise the description does not make much sense. The DNS TXT record does indeed facilitate recovery after the fact by signalling the availability of an updated policy. I would also like to encourage the authors to post revised drafts more frequently. Please see: https://www.ietf.org/mail-archive/web/ietf/current/threads.html#101804 -- Viktor.
- Re: [Uta] MTA-STS-03 review Daniel Margolis
- [Uta] MTA-STS-03 review ranjana mukhia
- Re: [Uta] MTA-STS-03 review Daniel Margolis
- Re: [Uta] MTA-STS-03 review Viktor Dukhovni
- Re: [Uta] MTA-STS-03 review ned+uta