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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. Mitja Kolsek‏ @mkolsek 11 Dec 2018
      • Report Tweet
      • Report NetzDG Violation
      Replying to @taviso

      I find the buffer overflow much more dangerous than the origin issue. We'd micropatch it - but first, do you think there are a pile of others there, which would make it pretty irrelevant?

      2 replies 0 retweets 0 likes
    2. Tavis Ormandy‏Verified account @taviso 11 Dec 2018
      • Report Tweet
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      Replying to @mkolsek

      Hmm, disagree, if they checked the Origin then only another local user could exploit the memory safety issues. If they don't check the origin but do check the JSON is well formed, then you can do things like send keystrokes to other applications 😬

      2 replies 0 retweets 0 likes
    3. Tavis Ormandy‏Verified account @taviso 11 Dec 2018
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      Replying to @taviso @mkolsek

      FWIW, I think a micropatch that checks the request headers for "Origin:" is totally feasible, I was using breakpoints and `da @esp..xxx; gc` to dump the headers.

      2 replies 0 retweets 1 like
    4. Mitja Kolsek‏ @mkolsek 11 Dec 2018
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      Replying to @taviso @ESP

      What would constitute a valid origin?

      1 reply 0 retweets 0 likes
    5. Tavis Ormandy‏Verified account @taviso 11 Dec 2018
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      Replying to @mkolsek @ESP

      I think if there is any Origin header, you can probably safely ignore it, it must have come from a website. A browser would never allow a website to send a request without an Origin header.

      1 reply 0 retweets 0 likes
    6. Mitja Kolsek‏ @mkolsek 11 Dec 2018
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      Replying to @taviso @ESP

      Who's a valid client for this web socket connection then?

      1 reply 0 retweets 0 likes
    7. Tavis Ormandy‏Verified account @taviso 11 Dec 2018
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      Replying to @mkolsek @ESP

      AFAIK, they have office/photoshop/etc plugins, so you can have photoshop-specific functions when photoshop is focussed (e.g. color selection), and excel specific when excel is focussed (e.g. increment cell). Those native plugins talk json over websockets, because it's 2018 🤷‍♂️

      1 reply 0 retweets 0 likes
    8. Mitja Kolsek‏ @mkolsek 11 Dec 2018
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      Replying to @taviso @ESP

      Got it. So local apps make local ws requests to configure your mouse. Can we be sure none of them send an Origin header? Also, is the web server only listening on localhost or is it accessible remotely? 😏

      1 reply 0 retweets 0 likes
    9. Tavis Ormandy‏Verified account @taviso 11 Dec 2018
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      Replying to @mkolsek @ESP

      I didn't check them all, but I didn't see one in testing. It's localhost only, but a website can open a websocket to ws://127.0.0.1, so just visiting a malicious website is enough to screw with your peripherals, exploit memory safety issues, spy on apps, etc.

      1 reply 0 retweets 1 like
    10. Mitja Kolsek‏ @mkolsek 11 Dec 2018
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      Replying to @taviso @ESP

      I suppose it's also an LPE issue even if/once the Origin issue were fixed: a local low-privileged malicious process can reprogram keys when admin is using the mouse.

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 11 Dec 2018
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      Replying to @mkolsek @ESP

      Yep, but I suggested they generate a per-user secret, but didn't want to set my expectations too high, I couldn't even get them to fix the RCE. 😞

      4:05 PM - 11 Dec 2018
      • 1 Like
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