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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 Dec 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @abatchy17

      Wait, I installed it, how is http://localbattle.net  using a valid certificate. I don't know if I want to look under this rock. 😬/cc @hannopic.twitter.com/UZJwPRJuGE

      4 replies 11 retweets 25 likes
    2. Tavis Ormandy‏Verified account @taviso 6 Dec 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @abatchy17 @hanno

      Damn, it gets waaay worse, like rce worse. I wish I hadn't looked, now I have to write a report.

      2 replies 8 retweets 55 likes
    3. Stanzilla‏ @stanzillaz 9 Dec 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @abatchy17 @hanno

      thread cc @sraub

      1 reply 0 retweets 1 like
    4. Stephen Raub‏ @sraub 9 Dec 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @stanzillaz @taviso and

      Yes, of course it is a valid certificate. Not seeing the issue here, care to explain?

      1 reply 0 retweets 2 likes
    5. Tavis Ormandy‏Verified account @taviso 9 Dec 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @sraub @stanzillaz and

      The only way that could have been implemented is if the private key is embedded in the binary. That is considered a key compromise, and CA's are *obligated* to revoke it.

      2 replies 0 retweets 12 likes
    6. Tavis Ormandy‏Verified account @taviso 9 Dec 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso @sraub and

      Here is a relevant recent discussionhttps://groups.google.com/d/msg/mozilla.dev.security.policy/T6emeoE-lCU/-k-A2dEdAQAJ …

      2 replies 1 retweet 5 likes
    7. hanno‏ @hanno 9 Dec 2017
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      • Report NetzDG Violation
      Replying to @taviso @sraub and

      and here the latest incident of this kind involving microsofthttps://www.golem.de/news/microsoft-dynamics-365-wildcard-certificate-with-a-private-key-for-everyone-1712-131544.html …

      1 reply 1 retweet 1 like
    8. Stephen Raub‏ @sraub 9 Dec 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @hanno @taviso and

      That sounds concerning but doesn't seem related. http://localbattle.net  is isolated domain on purpose. connections treated as insecure and other security measures are employed as necessary.

      1 reply 0 retweets 0 likes
    9. Tavis Ormandy‏Verified account @taviso 9 Dec 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @sraub @hanno and

      The attack would be a mitm replies to http://localbattle.net  with a non-loopback address, extracts the private-key from the binary and then can steal authentication data or whatever.

      2 replies 0 retweets 3 likes
    10. Stephen Raub‏ @sraub 9 Dec 2017
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      Replying to @taviso @hanno and

      The localhost endpoint is not relying on the certificate for security. The endpoint is treated with the same level of trust as a raw http connection. Other countermeasures are employed instead. Genuinely curious if there is a way to actually get anything out of it.

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 9 Dec 2017
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      Replying to @sraub @hanno and

      Confused by what "trust" you mean here. The only reason it's "localhost" is because that's what dns says, an attacker (e.g. hotel wi-fi) can lie and you would be talking to them instead.

      3:42 PM - 9 Dec 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Stephen Raub‏ @sraub 9 Dec 2017
          • Report Tweet
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          Replying to @taviso @hanno and

          Bad attempt at a generalized response. Implementation accounts for the possibility of dns hijacking and mitm attacks on both ends (browser and desktop endpoint).

          3 replies 0 retweets 1 like
        3. Tavis Ormandy‏Verified account @taviso 9 Dec 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @sraub @hanno and

          Hmm, can you email me from a blizzard email address? I can't give more details publicly without giving away the whole attack. I'm taviso <at> google <dot> com.

          1 reply 0 retweets 2 likes
        4. 2 more replies

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