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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. Tavis Ormandy‏Verified account @taviso 6 Mar 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @artem_i_baranov

      No, if your *client* is removing the attachment, then a minifilter will still see it. This is a silly excuse, and by those standards your "must work behind NAT" requirement wouldn't qualify either.

      1 reply 1 retweet 9 likes
    2. Tavis Ormandy‏Verified account @taviso 6 Mar 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @artem_i_baranov

      Why stop at $100k, why not offer a $1M prize and scope it so it's impossible? I don't get it.

      1 reply 0 retweets 8 likes
    3. Artem I. Baranov‏ @artem_i_baranov 6 Mar 2018
      • Report Tweet
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      Replying to @taviso

      Prices starting from $1M are related only for iOS 11 and are not related to security products.)

      2 replies 0 retweets 0 likes
    4. Artem I. Baranov‏ @artem_i_baranov 6 Mar 2018
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      Replying to @artem_i_baranov @taviso

      "Wormable" email-based exploit for AV engine need standalone email client on user' PC, who use Gmail and should download your crafted file.

      1 reply 0 retweets 0 likes
    5. Tavis Ormandy‏Verified account @taviso 6 Mar 2018
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      Replying to @artem_i_baranov

      No. Just prefetching activity and cache writes in Gmail is enough to trigger minifilter. How do you not know that, I've sent Kaspersky a working exploit that worked in Gmail before!

      2 replies 7 retweets 57 likes
    6. Alex Ionescu‏ @aionescu 6 Mar 2018
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      Replying to @taviso @artem_i_baranov

      Clearly they took it seriously and informed their engineers about it. Clearly.

      1 reply 0 retweets 12 likes
    7. Artem I. Baranov‏ @artem_i_baranov 6 Mar 2018
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      Replying to @aionescu @taviso

      I love u both too, but if I did not download a file in Gmail from attachment, I doubt that FS stack will know about it.

      1 reply 0 retweets 0 likes
    8. Tavis Ormandy‏Verified account @taviso 6 Mar 2018
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      Replying to @artem_i_baranov @aionescu

      Set up kd, put a breakpoint on your filter and db the data you see, then click around in Gmail. If you see untrusted data, I'm right. If you don't, then you're right. Hint: I'm right. 😛

      1 reply 1 retweet 14 likes
    9. Artem I. Baranov‏ @artem_i_baranov 6 Mar 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @aionescu

      Yes, u need to click Gmail and this is your first action. Wormable vector requires no user actions. That's why payout is high.

      2 replies 0 retweets 0 likes
    10. Tavis Ormandy‏Verified account @taviso 6 Mar 2018
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      Replying to @artem_i_baranov @aionescu

      It works without user interaction because of prefetching, I've already explained this. Fine, don't click anything, just wait for someone to send you email and watch for activity. 🙄

      2 replies 0 retweets 8 likes
      Tavis Ormandy‏Verified account @taviso 6 Mar 2018
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      Replying to @taviso @artem_i_baranov @aionescu

      Why not just remove the requirement for "database update channel" and specify "no user interaction"? If that's the real reason for that requirement, then problem solved.

      3:28 PM - 6 Mar 2018
      • 2 Likes
      • Adrien C.
      1 reply 0 retweets 2 likes
        1. Artem I. Baranov‏ @artem_i_baranov 6 Mar 2018
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          Replying to @taviso @aionescu

          Btw, returning to step back, probably "the truth is out there", if attachment is small and GMail places it "as is" on a web-page (attachment will be downloaded among other web page data), FS stack will see it. But in case of not small attachments this situation is excluded.

          0 replies 0 retweets 1 like
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