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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

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    1. Tavis Ormandy‏Verified account @taviso 11 Jun 2019
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      I noticed a bug in SymCrypt, the core library that handles all crypto on Windows. It's a DoS, but this means basically anything that does crypto in Windows can be deadlocked (s/mime, authenticode, ipsec, iis, everything). Microsoft committed to fixing it in 90 days, then didn't.

      12 replies 428 retweets 866 likes
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    2. Tavis Ormandy‏Verified account @taviso 11 Jun 2019
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      Today is day 91, so the issue is now public. I consider this relatively low severity, but you could take down an entire Windows fleet relatively easily, so it's worth being aware of. https://bugs.chromium.org/p/project-zero/issues/detail?id=1804 …

      17 replies 274 retweets 613 likes
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    3. Gareth Tunnock‏ @gaztunnock 11 Jun 2019
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      Replying to @taviso

      I understand de-restricting issues after a certain time when the vendor have been unwilling to fix/acknowledge the bug, but it looks like you are in dialogue with the vendor who are working on a fix, so why not wait until the patch is out?

      3 replies 0 retweets 16 likes
    4. Tavis Ormandy‏Verified account @taviso 11 Jun 2019
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      Replying to @gaztunnock

      The deadline was exceeded.

      2 replies 0 retweets 42 likes
    5. Gareth Tunnock‏ @gaztunnock 11 Jun 2019
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      Replying to @taviso

      if MS had committed to fix it in 120 days, would it still have been de-destricted now?

      1 reply 0 retweets 1 like
    6. Tavis Ormandy‏Verified account @taviso 11 Jun 2019
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      Replying to @gaztunnock

      Yes, that's how deadlines work.

      1 reply 1 retweet 86 likes
    7. Gareth Tunnock‏ @gaztunnock 11 Jun 2019
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      Replying to @taviso

      But you're working with vendors to make the Internet safer for all, so if the vendor, who has to do the work to fix it, says a deadline of 120 days, why not respect that, I honestly don't understand the inflexibility, certainly when dealing with this particular vendor

      3 replies 0 retweets 14 likes
      Tavis Ormandy‏Verified account @taviso 11 Jun 2019
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      Replying to @gaztunnock

      The policy is *highly* flexible, any number of days between 0 and 90 is acceptable. In addition, if an update or patch was already scheduled within 14 days of the deadline, we offer a "grace period" to align the schedule.

      9:46 AM - 11 Jun 2019
      • 1 Retweet
      • 39 Likes
      • FileswithThreateningAuras Mark Eichin phosphore Simon L. B. Nielsen regnil Steve Daniels busticated pizza wolf Jozef Izso Manel Montilla diaz
      4 replies 1 retweet 39 likes
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        2. Jun Kokatsu‏ @shhnjk 11 Jun 2019
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          Replying to @taviso

          So in your opinion (or is it Google’s opinion?), all vulnerabilities (from low to critical) should be fixed within 90 days?

          3 replies 0 retweets 8 likes
        3. Tavis Ormandy‏Verified account @taviso 11 Jun 2019
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          Replying to @shhnjk

          Three months is way too high in my opinion, it's a compromise. In open source, the norm is closer to 90 hours. Linus famously tells people not to tell him about bugs if you want them kept secret for more than two weeks, because he'll just fix them.

          2 replies 5 retweets 63 likes
        4. 16 more replies
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        2. Shahar Tal‏ @jifa 11 Jun 2019
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          Replying to @taviso @gaztunnock

          Excuse my minutiae inquiry, but was this decision (canceling grace period) communicated prior to or post derestriction? Did MS explicitly waive the grace period? i.e. “we can give you 14 days grace, but July is too far and we would have to derestrict, can you make it in 14?”

          2 replies 0 retweets 0 likes
        3. Tavis Ormandy‏Verified account @taviso 11 Jun 2019
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          Replying to @jifa @gaztunnock

          It only applies if there is an update already scheduled. It's not just a free 14 day extension. We settled on 90 days, but try to accommodate vendors with rigid patch schedules like Microsoft.

          1 reply 0 retweets 1 like
        4. 5 more replies
        1. ϻг_ϻε‏ @steventseeley 11 Jun 2019
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          Replying to @taviso @gaztunnock

          I think 14 days is fair. I did that with @Cisco to align with their patch release cycle. https://srcincite.io/advisories/src-2019-0034/ …

          0 replies 0 retweets 3 likes
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        1. Gareth Tunnock‏ @gaztunnock 11 Jun 2019
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          Replying to @taviso

          Considering the 0-90 days is set by P0 I don't think that can be used as an example of flexibility. I didn't know about the 14 grace period. The vendor said the fix will be pushed in ~28 days, so for the sake of waiting 14 days you've disclosed a bug making the Internet less safe

          0 replies 0 retweets 0 likes
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