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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. Tavis Ormandy‏Verified account @taviso Apr 1
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      Replying to @0xdade @MalwareTechBlog

      That's just MoTW, I've verified it works. No prompts required. I think someone could realistically click on that.pic.twitter.com/VwYGB5il48

      3 replies 16 retweets 47 likes
    2. dade‏ @0xdade Apr 1
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      Replying to @taviso @MalwareTechBlog

      What's MoTW stand for in this context? I tried to use that link style with http://bit.ly \\?\C:\Users\dade\Documents\exploit.bat and it just pulls up a bitly page and 404s. I'm on Zoom 4.6.7 (18176.0301) on Win 10 19592

      2 replies 0 retweets 2 likes
    3. dade‏ @0xdade Apr 1
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      Replying to @0xdade @taviso @MalwareTechBlog

      Anyways, I hold your opinion in high regard and do agree that your link looks quite clickable. Just wondering what's causing me to not be able to reproduce it.

      1 reply 0 retweets 3 likes
    4. Tavis Ormandy‏Verified account @taviso Apr 1
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      Replying to @0xdade @MalwareTechBlog

      That was just a zero-width space between the URL and the path to make it look like one long URL.

      1 reply 2 retweets 16 likes
    5. dade‏ @0xdade Apr 1
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      Replying to @taviso @MalwareTechBlog

      Ohhhh damn how did I not realize the zero width space would be so useful there. Very well done.

      1 reply 0 retweets 7 likes
    6. Tavis Ormandy‏Verified account @taviso Apr 1
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      Replying to @0xdade @MalwareTechBlog

      Haha, that obfuscation trick worked on you, so no doubting 😝 You can try to copy this if twitter doesn't mangle it: http://bit.ly ​\\?\C:\Users\dade\Downloads\exploit.bat:

      2 replies 2 retweets 15 likes
    7. dade‏ @0xdade Apr 1
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      Replying to @taviso @MalwareTechBlog

      Yup okay that replicates it. That's sneaky and awesome.

      1 reply 0 retweets 6 likes
    8. dade‏ @0xdade Apr 1
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      Replying to @0xdade @taviso

      pic.twitter.com/0P6A7jpM2x

      1 reply 5 retweets 15 likes
    9. Tavis Ormandy‏Verified account @taviso Apr 1
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      Replying to @0xdade @MalwareTechBlog

      Okay, how about this one (hxxp to avoid twitter munging, http works in Zoom): \\?\hxxp://youtube.com/watch?v=123124124&title=ZXhwbG9pdAo=\..\..\..\..\Users\dade\Docume~1\exploit.bat I should have been a phisher 😂

      4 replies 9 retweets 31 likes
    10. Mohamed A. Basset‏ @SymbianSyMoh Apr 1
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      Replying to @taviso @0xdade @MalwareTechBlog

      Is that applicable over a remote SMB share hosting a digitally signed binary? Unlike this one:https://youtu.be/Om1w4DVkkEU 

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso Apr 1
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      Replying to @SymbianSyMoh @0xdade @MalwareTechBlog

      I agree that's a bug, but very very low severity because of the very clear prompt.

      8:28 PM - 1 Apr 2020
      • 4 Likes
      • ~fembot Royce Williams darren Mohamed A. Basset
      3 replies 0 retweets 4 likes
        1. New conversation
        2. dade‏ @0xdade Apr 1
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          Replying to @taviso @SymbianSyMoh @MalwareTechBlog

          I wonder if they'd even bother to fix this type of bug when you can just send payload.exe over chat and they can download and run it without the prompt in about as many clicks.pic.twitter.com/rUcvCjaAw6

          2 replies 0 retweets 4 likes
        3. dade‏ @0xdade Apr 1
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          Replying to @0xdade @taviso and

          I guess at least this is a little more clear that you're download a file and then running it than the UNC path execution version.

          1 reply 0 retweets 0 likes
        4. 1 more reply
        1. Mohamed A. Basset‏ @SymbianSyMoh Apr 1
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          Replying to @taviso @0xdade @MalwareTechBlog

          Agree about the severity but does pulling a signed bin from a remote SMB share evades the warning message?

          0 replies 0 retweets 0 likes
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        2. Mohamed A. Basset‏ @SymbianSyMoh Apr 1
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          Replying to @taviso @0xdade @MalwareTechBlog

          We can have this chained as follows: 1. Leaking user's domain and username 2. Somehow trigger a file download action to have a file let's say "win64.exe" in \users\{username}\downloads\win64.exe 3. Using the leaked user name to craft an auto execute link:pic.twitter.com/UX6CNucq8k

          1 reply 0 retweets 0 likes
        3. Mohamed A. Basset‏ @SymbianSyMoh Apr 1
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          Replying to @SymbianSyMoh @taviso and

          I've actually tried it and it worked like a charm (except for the downloading step which done manually just for the sake of the PoC)

          1 reply 0 retweets 0 likes
        4. 1 more reply

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