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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 25 Nov 2019
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      Wait, what is this bullshit, @Fortinet? https://seclists.org/bugtraq/2019/Nov/38 …pic.twitter.com/AVUXDbFaCK

      50 replies 266 retweets 670 likes
      Show this thread
    2. Kevin Beaumont‏Verified account @GossiTheDog 26 Nov 2019
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      Replying to @matthew_d_green @Fortinet

      Sophos use ROT13 over DNS.

      3 replies 1 retweet 19 likes
    3. Martijn Grooten‏ @martijn_grooten 26 Nov 2019
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      Replying to @GossiTheDog @matthew_d_green @Fortinet

      That's a feature rather than a bug, right?

      1 reply 0 retweets 3 likes
    4. Kevin Beaumont‏Verified account @GossiTheDog 26 Nov 2019
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      Replying to @martijn_grooten @matthew_d_green @Fortinet

      Yes it’s the intended design. In fairness it’s possible they’ve since changed it, I’m not longer a Sophos admin 😢

      1 reply 0 retweets 2 likes
    5. Martijn Grooten‏ @martijn_grooten 26 Nov 2019
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      Replying to @GossiTheDog @matthew_d_green @Fortinet

      I had a quick read on what they do and it makes perfect sense.

      2 replies 0 retweets 1 like
    6. Tavis Ormandy‏Verified account @taviso 26 Nov 2019
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      Replying to @martijn_grooten @GossiTheDog and

      Do you have a link to the document that makes perfect sense?

      1 reply 0 retweets 0 likes
    7. Martijn Grooten‏ @martijn_grooten 26 Nov 2019
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      Replying to @taviso @GossiTheDog and

      From this https://community.sophos.com/kb/en-us/111090  I derive it's about lookups of domains against some blacklist. Given that these domains are themselves queried over DNS, there's little point to encrypt the blacklist lookups. Basic obfuscation against keyword matching could make sense.

      1 reply 0 retweets 2 likes
    8. Tavis Ormandy‏Verified account @taviso 26 Nov 2019
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      Replying to @martijn_grooten @GossiTheDog and

      This was the result I saw, which says it can contain URLs and file submissions, which does not make perfect sense unless there was some context I'm missing... https://community.sophos.com/kb/en-us/117936#SXL%20lookup%20types …

      1 reply 0 retweets 1 like
    9. Kevin Beaumont‏Verified account @GossiTheDog 26 Nov 2019
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      Replying to @taviso @martijn_grooten and

      Also file hashes and some other stuff

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 26 Nov 2019
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      Replying to @GossiTheDog @martijn_grooten and

      Hmm I think that's not good.

      11:53 AM - 26 Nov 2019
      • 5 Likes
      • Peter J. Fry #StayHome 😷 Picaro Byte Toby Pinder uɐpʇou@ ✸ Sherif Mansour
      4 replies 0 retweets 5 likes
        1. New conversation
        2. Kevin Beaumont‏Verified account @GossiTheDog 26 Nov 2019
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          Replying to @taviso @martijn_grooten and

          It’s not unique to Sophos in fairness. You can pull some pretty funky stuff from historic DNS lookups. It’s probably net positive tho as it gives you pretty much real-time blocking, although the implementation probably needs a rework in space year 2020.

          2 replies 0 retweets 1 like
        3. Tavis Ormandy‏Verified account @taviso 26 Nov 2019
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          Replying to @GossiTheDog @martijn_grooten and

          Sending full URLs plaintext over the public internet? 😬I know Avast used to do it with a chrome extension, but we told them they need to stop that or they're out of the webstore... I think they agreed to start sending them over https.

          2 replies 0 retweets 3 likes
        4. 3 more replies
        1. New conversation
        2. Martijn Grooten‏ @martijn_grooten 26 Nov 2019
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          Replying to @taviso @GossiTheDog and

          Martijn Grooten Retweeted Kevin Beaumont

          I'm not saying it is great, but it is very common. But ROT13 isn't the issue here. Also:https://twitter.com/GossiTheDog/status/1199413880784670720 …

          Martijn Grooten added,

          Kevin BeaumontVerified account @GossiTheDog
          Replying to @martijn_grooten @matthew_d_green @Fortinet
          It’s more complex as an issue for Twitter, you can use DNS logs (as some of the public DNS servers sell the data) to gather intel. Eg I used to use it to know what was in the wild as I could see data from PCs. It’s not unique to Sophos tho. They should probably do SSL lookups.
          1 reply 0 retweets 0 likes
        3. Toby Pinder‏ @tobypinder 26 Nov 2019
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          Replying to @martijn_grooten @taviso and

          As a layperson though I feel rot13 is a smell, right? Some enterprise customer freaked (probably because those URLs were tripping something else) and rather than exploring a real solution they rotated some letters around 🙃

          0 replies 0 retweets 1 like
        4. End of conversation
        1. TechByTom‏ @techbytom 26 Nov 2019
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          Replying to @taviso @GossiTheDog and

          At least they put "encryption" in quotes, so you know it's good.

          0 replies 0 retweets 0 likes
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        1. uɐpʇou@ ✸‏ @notdan 26 Nov 2019
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          Replying to @taviso @GossiTheDog and

          Lmao

          0 replies 0 retweets 0 likes
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