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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. Alessio‏ @_meliot 26 Oct 2018
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      Replying to @GossiTheDog @taviso @x0rz

      You already have "remote code execution" as domain user then, the vulnerability just elevates your privileges to system. You can't exploit the vulnerability if you can't already execute commands on the machine... That's why it is an LPE, not RCE.

      2 replies 0 retweets 6 likes
    2. Kevin Beaumont‏Verified account @GossiTheDog 26 Oct 2018
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      Replying to @_meliot @taviso @x0rz

      I disagree, it’s remote code execution because it allows remote code execution. But peeps can call it whatever they want, it’s all just noise.

      1 reply 0 retweets 0 likes
    3. Tavis Ormandy‏Verified account @taviso 26 Oct 2018
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      Replying to @GossiTheDog @_meliot @x0rz

      Hmm, I'm not trying to be argumentative, I respect your opinion, just trying to understand your reasoning. We agree that "psexec" is not an RCE vuln, right?

      4 replies 0 retweets 10 likes
    4. Tavis Ormandy‏Verified account @taviso 26 Oct 2018
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      Replying to @taviso @GossiTheDog and

      My understanding is that you would effectively need psexec access to exploit this, do we agree on that?

      1 reply 0 retweets 0 likes
    5. Kevin Beaumont‏Verified account @GossiTheDog 26 Oct 2018
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      Replying to @taviso @_meliot @x0rz

      Nope. Nmap exploit module is here: https://svn.nmap.org/nmap/scripts/smb-webexec-exploit.nse …

      2 replies 0 retweets 1 like
    6. Tavis Ormandy‏Verified account @taviso 26 Oct 2018
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      Replying to @GossiTheDog @_meliot @x0rz

      I read it, but I can't get past this "Given a Windows account (local or domain), this will start an arbitrary executable" , that requirement means it misses the bar for RCE for me.

      2 replies 0 retweets 7 likes
    7. Tavis Ormandy‏Verified account @taviso 26 Oct 2018
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      Replying to @taviso @GossiTheDog and

      /cc @iagox86 who can maybe educate me! 🤓

      1 reply 0 retweets 1 like
    8. Ron Bowes‏ @iagox86 26 Oct 2018
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      Replying to @taviso @GossiTheDog and

      My understanding (not being a Windows guy) is that with an unprivileged local / domain account, you can't do much against Windows (other than log in at a console). This gives you the ability to run code against a remote system that you otherwise couldn't.

      2 replies 0 retweets 1 like
    9. Tavis Ormandy‏Verified account @taviso 26 Oct 2018
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      Replying to @iagox86 @GossiTheDog and

      AFAIK, it uses svcctl, which is also enough for psexec, no? If you consider psexec a vulnerability, then that would explain our terminology difference!

      2 replies 0 retweets 2 likes
    10. Ron Bowes‏ @iagox86 26 Oct 2018
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      Replying to @taviso @GossiTheDog and

      Psexec requires you to install a service, which means running OpenSCManager with SC_MANAGER_ALL_ACCESS. Webexec only requires you to start a service, which is a very small set of permissions (SC_MANAGER_CONNECT) - *any* local/domain user can do it with no special groups

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 26 Oct 2018
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      Replying to @iagox86 @GossiTheDog and

      Right, psexec needs an administrator to turn it on before it can be used. If it didn't, you would consider it an RCE?

      2:57 PM - 26 Oct 2018
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      1 reply 0 retweets 1 like
        1. New conversation
        2. Ron Bowes‏ @iagox86 26 Oct 2018
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          Replying to @taviso @GossiTheDog and

          Good question. I think intent is what makes the difference here - psexec means using the remote service service the way it's meant (which is why it's admin-only), whereas webexec is the result of a coding oversight.

          1 reply 0 retweets 1 like
        3. Ron Bowes‏ @iagox86 26 Oct 2018
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          Replying to @iagox86 @taviso and

          I think if psexec worked for any local/domain user, it probably would be considered a vulnerability.

          1 reply 0 retweets 0 likes
        4. 2 more replies

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