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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. KMFT ⬡‏ @daoist 8 Oct 2019
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      KMFT ⬡ Retweeted Tavis Ormandy

      The very same people who tell us malware will obey our endpoint DNS configuration are busy deploying web browsers which default to doing just the opposite.https://twitter.com/taviso/status/1181760420056428544 …

      KMFT ⬡ added,

      Tavis OrmandyVerified account @taviso
      Replying to @paulvixie
      If they're your pwned endpoints, then you can and should monitor, filter and restrict them anyway you please. If they're not yours, then get permission or mind your own business.
      1 reply 0 retweets 1 like
    2. Tavis Ormandy‏Verified account @taviso 8 Oct 2019
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      Replying to @daoist

      You misunderstood. You need permission from the user before you start spying on them, i.e. if the endpoint is not your property or you're not authorized by the owner (e.g. you have root) you should ask the person who owns it before monitoring what they're doing, fair?

      1 reply 1 retweet 1 like
    3. KMFT ⬡‏ @daoist 8 Oct 2019
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      Replying to @taviso

      That's fair, but you seem to be misunderstanding the objections as well. We're not crying because we can't spy on people at Starbucks. We *are* authorized to monitor our endpoints and have to make security sacrifices just so folks can /change which corporation/ spies on them :(

      1 reply 0 retweets 0 likes
    4. Tavis Ormandy‏Verified account @taviso 8 Oct 2019
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      Replying to @daoist

      I don't follow. If you're authorized to administer the endpoints, just don't use DoH and no sacrifices will be necessary?

      1 reply 0 retweets 0 likes
    5. KMFT ⬡‏ @daoist 8 Oct 2019
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      Replying to @taviso

      I can control the endpoint and the applications *I* deploy to it. Controlling what malware decides to do is another matter.

      1 reply 0 retweets 0 likes
    6. Tavis Ormandy‏Verified account @taviso 8 Oct 2019
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      Replying to @daoist

      I still don't follow, if you're asking malware authors to promise never to use DoH, isn't that what you were making fun of earlier? To quote you, "Pretty please use the DNS resolver I configured?".

      2 replies 0 retweets 0 likes
    7. Tavis Ormandy‏Verified account @taviso 8 Oct 2019
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      Replying to @taviso @daoist

      It seems like you're saying you think software shouldn't use DoH because if you disable it, malware might ignore you. That just doesn't make sense - malware *is* software - it can use DoH today whether other software does or not.

      1 reply 0 retweets 0 likes
    8. KMFT ⬡‏ @daoist 8 Oct 2019
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      Replying to @taviso

      imagine if DoH were never an RFC and wasn't deployed by the top unblockable web search provider. In that world, malware would not be able to use DoH without being obvious and being caught. I'm not saying we shouldn't *use* DoH. I'm saying we shouldn't even *invent* it.

      1 reply 0 retweets 0 likes
    9. Tavis Ormandy‏Verified account @taviso 8 Oct 2019
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      Replying to @daoist

      Isn't that just saying "Pretty please only use these protocols?", it's just a minor variation of what you were making fun of. Malware authors use their own protocols all the time? https://attack.mitre.org/techniques/T1094/ …

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 8 Oct 2019
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      Replying to @taviso @daoist

      In general, I reject the argument that we shouldn't invent anything that malware might benefit from. Malware can and does abuse cryptography, email, irc, twitter, anything. The benefit to society of those things is too great to not invent them. 🤷🏻‍♂️

      9:49 PM - 8 Oct 2019
      • 1 Like
      • cucrisis
      1 reply 0 retweets 1 like
        1. New conversation
        2. KMFT ⬡‏ @daoist 9 Oct 2019
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          Replying to @taviso

          we disagree on the benefit to society. DoH promises that one's queries won't be spied upon. Instead it just aggregates the spying into the hands of larger entities who can then create a more full picture of my activity. to me that's *worse* than plaintext DNS.

          1 reply 0 retweets 1 like
        3. Tavis Ormandy‏Verified account @taviso 9 Oct 2019
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          Replying to @daoist

          DNS snooping is a real problem, invasive ISPs and wifi networks are real scenarios for people. You'll be able to disable it on your endpoints if you think it's worse than plaintext DNS (?), but we should do something for the users affected. Not everyone is as lucky as you.

          2 replies 1 retweet 1 like
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