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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. Matthew Green‏ @matthew_d_green May 23
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      Replying to @taviso @halvarflake and

      Ah. But that’s a capability that degrades rapidly. And if every latest version is riddled with new bugs, eventually you’ll ring people’s alarms.

      1 reply 0 retweets 0 likes
    2. Tavis Ormandy‏Verified account @taviso May 23
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      Replying to @matthew_d_green @halvarflake and

      So if the second Tuesday of every month, Microsoft published dozens of new bugs, people might stop using Windows?

      1 reply 1 retweet 8 likes
    3. Matthew Green‏ @matthew_d_green May 23
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      Replying to @taviso @halvarflake and

      I did.

      1 reply 0 retweets 5 likes
    4. Tavis Ormandy‏Verified account @taviso May 23
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      Replying to @matthew_d_green @halvarflake and

      😛 OK, but I'm guessing you still use an OS that has regular security updates of bugdoor-equivalent vulnerabilities? So the point remains, right? There would be no penalty for getting caught shipping a bugdoor.

      1 reply 0 retweets 1 like
    5. Matthew Green‏ @matthew_d_green May 23
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      Replying to @taviso @halvarflake and

      This is a Henry Ford fallacy. Like saying “what if a medication had side effects and people still took it, wouldn’t that imply any medicine could have serious side effects and people would take it?” Let medication1 be Insulin. Let medication2 be that weird eyelash-growing stuff.

      1 reply 1 retweet 0 likes
    6. Matthew Green‏ @matthew_d_green May 23
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      Replying to @matthew_d_green @taviso and

      People can’t live without Windows but apparently the DoD can live without certain videoconferencing platforms.

      2 replies 0 retweets 1 like
    7. Tavis Ormandy‏Verified account @taviso May 23
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      Replying to @matthew_d_green @halvarflake and

      Ah, so you're saying that Microsoft is too important, if something like Signal had something that *could* have been a bugdoor, people would abandon it? Then how do you explain this: https://bugs.chromium.org/p/project-zero/issues/detail?id=1943 …

      1 reply 0 retweets 3 likes
    8. Matthew Green‏ @matthew_d_green May 23
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      Replying to @taviso @halvarflake and

      I was talking about the scenario where an app just kept spewing vulnerabilities as fast as the old ones were found. Not sure Signal has done this.

      1 reply 0 retweets 3 likes
    9. Tavis Ormandy‏Verified account @taviso May 23
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      Replying to @matthew_d_green @halvarflake and

      But you agree the reproducible build isn't a factor? Doesn't that mean I've convinced you? 😛

      1 reply 0 retweets 0 likes
    10. Matthew Green‏ @matthew_d_green May 23
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      Replying to @taviso @halvarflake and

      Did @natashenka find the bugs in source or binary?

      1 reply 0 retweets 2 likes
      Tavis Ormandy‏Verified account @taviso May 23
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      Replying to @matthew_d_green @halvarflake and

      AFAIK, decompiled binary, but we definitely agree source availability is useful. The discussion is about reproducible builds.

      10:46 AM - 23 May 2020
      • 3 Likes
      • Deirdre Connolly¹ cucrisis
      2 replies 0 retweets 3 likes
        1. New conversation
        2. Matthew Green‏ @matthew_d_green May 23
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          Replying to @taviso @halvarflake and

          I suspect you and @natashenka are wizards with decompilers, and so perhaps working with them does not add the 50x overhead it would add to me. But does it add any overhead? If so, repro builds should eliminate that.

          1 reply 0 retweets 0 likes
        3. Matthew Green‏ @matthew_d_green May 23
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          Replying to @matthew_d_green @taviso and

          50x -> 5000x realistically :)

          1 reply 0 retweets 0 likes
        4. 12 more replies
        1. Michele Adduci‏ @m_adduci May 23
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          Replying to @taviso @matthew_d_green and

          Aren't reproducible builds focusing more on dependency tracking (a build X uses library in version Y.Z) than on security itself?

          0 replies 0 retweets 0 likes
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