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

Tweets

Tavis OrmandyVerified account

@taviso

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

California
taviso.decsystem.org
Joined April 2008

Tweets

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    1. Dino A. Dai Zovi‏ @dinodaizovi May 10
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      • Report NetzDG Violation

      Long ago, most assumed more memory safety errors were not exploitable vulnerabilities than actually were. At some point, mitigations deployed in many systems turned the tide: most now assume more safety errors are exploitable vulnerabilities than actually are.

      2 replies 13 retweets 42 likes
    2. halvarflake‏ @halvarflake May 10
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      Replying to @dinodaizovi

      depending on the surrounding code, a lot of really shitty bugs are exploitable though; it is somewhat rare to see a bona fide unexploitable mem corruption in a browser...

      2 replies 1 retweet 10 likes
    3. Mitja Kolsek‏ @mkolsek May 10
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      Replying to @halvarflake @dinodaizovi

      I feel both of you are right and technically you could be (amount of bugs "most assume are exploitable" vs. actually exploitable bugs) but would like to see this develop into a data-backed thread.

      2 replies 0 retweets 3 likes
    4. halvarflake‏ @halvarflake May 10
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      Replying to @mkolsek @dinodaizovi

      The cost of acquiring a data point is approximately 100k; are you sure you have 2.5m to spend on the question?

      2 replies 0 retweets 1 like
    5. Mitja Kolsek‏ @mkolsek May 10
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      Replying to @halvarflake @dinodaizovi

      If all it took for our industry to scientifically determine whether exploit mitigations have a significant positive effect or not were 2.5m, I'd be willing to chip in my company's share of that.

      1 reply 0 retweets 1 like
      Tavis Ormandy‏Verified account @taviso May 10
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      Replying to @mkolsek @halvarflake @dinodaizovi

      Nobody can even agree what "positive effect" means 😜 For example, I think not even Microsoft argue that CFG makes vulns unexploitable, but many people still consider it useful, arguing it forces you to jump through significant hoops.

      3:01 PM - 10 May 2020
      • 1 Like
      • halvarflake
      1 reply 0 retweets 1 like
        1. New conversation
        2. Mitja Kolsek‏ @mkolsek May 10
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          Replying to @taviso @halvarflake @dinodaizovi

          MS advisories pretty much as a rule describe all memory corruption issues as RCE, supporting your point.

          1 reply 0 retweets 0 likes
        3. X D‏ @XD99683234 May 10
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          Replying to @mkolsek @taviso and

          claiming a memory safety error is unexploitable is like claiming you are the smartest person in the room. you're very likely wrong.

          0 replies 0 retweets 0 likes
        4. End of conversation

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