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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

Tweets

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    1. 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
    2. 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
    3. Allan Wirth‏ @Allan_Wirth 2 Apr 2017
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      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
    4. 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
    5. 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
    6. 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)

      1 reply 0 retweets 0 likes
    7. Allan Wirth‏ @Allan_Wirth 4 Apr 2017
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      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
    8. Allan Wirth‏ @Allan_Wirth 4 Apr 2017
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      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
    9. Tavis Ormandy‏Verified account @taviso 4 Apr 2017
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      Replying to @Allan_Wirth

      Ahh, I see, that is interesting. I didn't believe it would work across worlds, you're right, it does. That's...worrying /cc @0x6D6172696F

      1 reply 1 retweet 2 likes
    10. Tavis Ormandy‏Verified account @taviso 4 Apr 2017
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      Replying to @taviso @Allan_Wirth

      That is going to make something exploitable for sure. Thanks for making the demo! 😀

      1 reply 0 retweets 2 likes
      Tavis Ormandy‏Verified account @taviso 4 Apr 2017
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      Replying to @taviso @Allan_Wirth

      Maybe this is even a bug? 🤔 //cc @arturjanc @mikewest @nasko @zetafuncti0n

      11:22 AM - 4 Apr 2017
      • 1 Like
      • ~fembot
      2 replies 0 retweets 1 like
        1. New conversation
        2. Mike West‏ @mikewest 4 Apr 2017
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          Replying to @taviso @Allan_Wirth and

          Seems like it. Would you mind filing something? I'm sure @zetafuncti0n can fix it tonight while I'm sleeping. :)

          1 reply 0 retweets 0 likes
        3. Tavis Ormandy‏Verified account @taviso 4 Apr 2017
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          Replying to @mikewest @Allan_Wirth and

          Sure, filing it now.

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. New conversation
        2. Allan Wirth‏ @Allan_Wirth 4 Apr 2017
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          Replying to @taviso @arturjanc and

          Why is this a bug? Shouldn't content scripts be able to access these methods just like any other method on DOM nodes?

          1 reply 0 retweets 0 likes
        3. Tavis Ormandy‏Verified account @taviso 4 Apr 2017
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          Replying to @Allan_Wirth @arturjanc and

          Each world is supposed to have it's own version of the object, I think this breaks that promise.

          2 replies 0 retweets 2 likes
        4. 1 more reply

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