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taviso's profile
Tavis Ormandy
Tavis Ormandy
Tavis Ormandy
Verified account
@taviso

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Tavis OrmandyVerified account

@taviso

Vulnerability researcher at Google. This is a personal stream, opinions expressed are mine.

California
taviso.decsystem.org
Joined April 2008

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    1. Bert Hubert  🇪🇺‏ @PowerDNS_Bert 28 Oct 2019
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      This is an important reiteration of Google Chrome's existing policy on DoH. Chrome will support DoH but will not change a user's DNS provider by itself. It will only upgrade to DoH to the same provider if 1) it supports it 2) it is on a whitelist.https://blog.chromium.org/2019/10/addressing-some-misconceptions-about.html …

      1 reply 49 retweets 84 likes
      Show this thread
    2. Bert Hubert  🇪🇺‏ @PowerDNS_Bert 28 Oct 2019
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      Bert Hubert  🇪🇺 Retweeted Bert Hubert  🇪🇺

      In stark contrast, Firefox has decided it can just change the users' DNS to Cloudflare and only provide a notification about this, with a scary looking 'Disable Protection' button if you don't like it.https://twitter.com/PowerDNS_Bert/status/1187671766606532609 …

      Bert Hubert  🇪🇺 added,

      Bert Hubert  🇪🇺 @PowerDNS_Bert
      Dark Pattern: "a user interface that has been carefully crafted to trick users into doing things". Mozilla, which did a lot of the research into how users react to security warnings, has provided the new gold standard picture of a "Dark Pattern". Details: https://www.zdnet.com/article/mozilla-cloudflare-doesnt-pay-us-for-any-doh-traffic/#ftag=RSSbaffb68 … pic.twitter.com/acdgUfnU5s
      Show this thread
      2 replies 9 retweets 21 likes
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    3. Bert Hubert  🇪🇺‏ @PowerDNS_Bert 28 Oct 2019
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      Despite Google Chrome's current sane policy, I still urge internet service providers to: 1) Stop doing NXDOMAIN redirection 2) If not (allowed to do) logging/selling DNS data, say so 3) Offer encrypted DNS services (DoT/DoH) 4) Enable DNSSEC 5) Shore up DNS performance

      4 replies 29 retweets 54 likes
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    4. Bert Hubert  🇪🇺‏ @PowerDNS_Bert 28 Oct 2019
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      If these steps are not taken, public DNS providers can credibly claim their DNS is better & might take it from you. I firmly believe the world will not be better if "DNS moves to the web", or as @paulvixie says, "the internet and the web part ways".

      2 replies 12 retweets 27 likes
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    5. Bert Hubert  🇪🇺‏ @PowerDNS_Bert 29 Oct 2019
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      Update: to get on the Google Chrome whitelist (if you are a big access operator that runs DoH), contact doh-provider@chromium.org - details are on: http://lists.encrypted-dns.org/scripts/wa-ENCDNS.exe?A2=ENCRYPTED-DNS;f98e120c.1910&S= …

      1 reply 1 retweet 8 likes
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    6. Bert Hubert  🇪🇺‏ @PowerDNS_Bert 31 Oct 2019
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      And a final update: Your connectivity to Cloudflare will be a *SINGLE POINT OF FAILURE* for your US Firefox users. And DoH is very sensitive to packet loss! So: 6) If you host DNS, make sure your peering/connectivity to Cloudflare is top notch 7) If an access provider, same

      3 replies 3 retweets 8 likes
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    7. Daniel Stenberg‏Verified account @bagder 31 Oct 2019
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      Replying to @PowerDNS_Bert @paulvixie

      Using DoH from Cloudflare is *less* of a single point of failure than normally for users since they can fall back to the regular resolver, while users using only the regular resolver rarely have a backup...

      1 reply 0 retweets 9 likes
      Tavis Ormandy‏Verified account @taviso 31 Oct 2019
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      Replying to @bagder @PowerDNS_Bert @paulvixie

      Yes, like most of the the other anti-DoH argument, this SPOF argument makes zero sense. It's no more or less of a SPOF than your existing provider.

      8:58 AM - 31 Oct 2019
      • 10 Likes
      • n owen Michael Pyne Michael Young FIPSmode Squad निर्भीक चौहान Ryan Hurst Ben Daniel Stenberg
      1 reply 0 retweets 10 likes
        1. New conversation
        2. Paul Vixie‏ @paulvixie 31 Oct 2019
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          Replying to @taviso @bagder @PowerDNS_Bert

          thanks for your snap judgement. i have more resilience and fewer possible points of failure than anyone using a so-called "public resolver" with or without DoH will ever have. and: you can too!

          2 replies 1 retweet 11 likes
        3. Tavis Ormandy‏Verified account @taviso 31 Oct 2019
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          Replying to @paulvixie @bagder @PowerDNS_Bert

          I believe you, I think you're very good at what you do. Your users are very lucky to have such reliable infrastructure, but a lot of people are not your users.

          1 reply 0 retweets 4 likes
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