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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 31 Mar 2017
      • Report Tweet
      • Report NetzDG Violation

      LastPass have fixed the remote code execution bug I reported last week. 🚿🐛 https://bugs.chromium.org/p/project-zero/issues/detail?id=1225 …

      21 replies 416 retweets 834 likes
    2. Allan Wirth‏ @Allan_Wirth 2 Apr 2017
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso

      Did you play around with ExternalInterface.addCallback? I think you can register funcs on HTMLObjectElement and do http://form.object.foo ()

      2 replies 0 retweets 0 likes
    3. Tavis Ormandy‏Verified account @taviso 2 Apr 2017
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      Replying to @Allan_Wirth

      I don't think that works across isolated worlds, unfortunately.

      1 reply 0 retweets 2 likes
    4. Allan Wirth‏ @Allan_Wirth 2 Apr 2017
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      Replying to @taviso

      Why not? Origin issues? I'll have to play with it later.

      1 reply 0 retweets 0 likes
    5. Allan Wirth‏ @Allan_Wirth 2 Apr 2017
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      • Report NetzDG Violation
      Replying to @Allan_Wirth @taviso

      Just tested. Seems to work in Chrome content scripts but not Firefox. Code at https://fromwhenceitca.me/ExternalInterface/ …

      1 reply 1 retweet 2 likes
    6. Allan Wirth‏ @Allan_Wirth 2 Apr 2017
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      Replying to @Allan_Wirth @taviso

      ExternalInterface.addCallback allows arbitrary return objects. Unfortunately form trick only allows one array/item access from the global :(

      1 reply 0 retweets 1 like
    7. Allan Wirth‏ @Allan_Wirth 4 Apr 2017
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      Replying to @Allan_Wirth @taviso

      Also looks like, if you http://ExternalInterface.call  in a callback called from content script, you're NOT in the isolated world.

      1 reply 0 retweets 1 like
      Tavis Ormandy‏Verified account @taviso 4 Apr 2017
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      Replying to @Allan_Wirth

      You've lost me, and your files all 403. how do you make a content script use http://ExtenalInterface.call  without XSS? (i.e. already won)

      10:49 AM - 4 Apr 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Allan Wirth‏ @Allan_Wirth 4 Apr 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @taviso

          Oops, perms fixed. The stack going from content script world to other isn't a security issue, more just unexpected and strange.

          1 reply 0 retweets 0 likes
        3. Allan Wirth‏ @Allan_Wirth 4 Apr 2017
          • Report Tweet
          • Report NetzDG Violation
          Replying to @Allan_Wirth @taviso

          The addCallback working on HTMLObjectElement from isolated world in Chrome though probably is useful for exploiting some bugs like the 🚿🐛

          2 replies 0 retweets 1 like
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