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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. Tavis Ormandy‏Verified account @taviso 8 Sep 2019
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      Replying to @munin @http_error_418

      Hmm, if I understand your argument correctly, DoH is bad because ISPs or network administrators will do TLS interception more often to avoid going dark, and TLS interception is bad. But I don't see how it follows, if you can do TLS interception you can also disable DoH?

      1 reply 0 retweets 1 like
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    3. Tavis Ormandy‏Verified account @taviso 8 Sep 2019
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      Replying to @munin @http_error_418

      No, I mean you can't enable TLS interception without Admin (either via group policy, software run with consent, modifying the image, etc). Those are also all sufficient to disable DoH in the browser settings, right?

      1 reply 0 retweets 0 likes
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    5. Tavis Ormandy‏Verified account @taviso 8 Sep 2019
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      Replying to @munin @http_error_418

      I'm pro-DoH, I'm trying to understand your concern 🤣. It seems pretty arbitrary to be concerned about monitoring for exfiltration via DoH, but not arbitrary other means of tunnelling DNS (e.g. DNS over SSH), or just any other protocol.

      2 replies 0 retweets 3 likes
    6. Kevin Beaumont‏Verified account @GossiTheDog 8 Sep 2019
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      Replying to @taviso @munin @http_error_418

      Enterprises tend to block outbound SSH, but not bound TLS. But Twitter is a bad place for me to discuss this, as there’s a lot of nuance to the subject 😂

      1 reply 0 retweets 3 likes
    7. Tavis Ormandy‏Verified account @taviso 8 Sep 2019
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      Replying to @GossiTheDog @munin @http_error_418

      I just picked SSH at random, it can be DNS queries steganographically embedded in PDF files shared over email. Do people really argue they can prevent DNS queries from being tunnelled out of a network? 😮

      2 replies 1 retweet 8 likes
    8. John Bambenek‏Verified account @bambenek 8 Sep 2019
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      Replying to @taviso @GossiTheDog and

      *sigh* Just because DNS theoretically could be tunneled via other means doesn’t mean its in users’ best interest for a for-profit intelligence firm to have DoH & use their monopoly power to shove it into browsers to bypass everyone’s security controls so they can make more money.

      1 reply 1 retweet 2 likes
    9. Tavis Ormandy‏Verified account @taviso 8 Sep 2019
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      Replying to @bambenek @GossiTheDog and

      We're just going in circles here. The difference is that by connecting to free coffee shop wifi, I'm not explicitly stating I want them to monitor my activity. That should not be the default.

      1 reply 0 retweets 0 likes
    10. John Bambenek‏Verified account @bambenek 8 Sep 2019
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      Replying to @taviso @GossiTheDog and

      So the default should be a for-profit intelligence agency should be the only one who can do the snooping?

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 8 Sep 2019
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      Replying to @bambenek @GossiTheDog and

      I think there shouldn't be any snooping going on at all. We can't enforce that technically yet, but we can enforce it by making the default an organization that's contractually bound to respect privacy. Make sense?

      10:54 AM - 8 Sep 2019
      0 replies 0 retweets 0 likes

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