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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. chort  ↙️ ↙️ ↙️ Abolish ICE‏ @chort0 21 Dec 2017
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      Replying to @taviso @sraub and

      Because they create a CA that is installed in your trusted root and set to fully-trusted for certificates of any purpose. It can generate MITM certs for any site, sign any binary, etc. Why not just a self-signed non-CA?

      1 reply 0 retweets 2 likes
    2. Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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      Replying to @chort0 @sraub and

      It's per-machine though right? What is the attack you're thinking of? If an attacker requires Administrator, then they can already insert new roots.

      1 reply 0 retweets 5 likes
    3. chort  ↙️ ↙️ ↙️ Abolish ICE‏ @chort0 21 Dec 2017
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      Replying to @taviso @sraub and

      Same as AV that does this. I don't want to trust their with MITM capability. Again, why not just create a per-machine self-signed cert with subjectAlternativeName that matches http://localbattle.net  and set that as trusted in normal cert store?

      1 reply 0 retweets 2 likes
    4. Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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      Replying to @chort0 @sraub and

      I guess I'm confused, you already trust them by running setup.exe. I understand if there was additional attack surface (that would be the AV complaint), but what attack surface does adding a locally generated CA add?

      1 reply 0 retweets 1 like
    5. Marsh Ray‏ @marshray 21 Dec 2017
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      Replying to @taviso @chort0 and

      Why does a hotel mind if you make a duplicate copy of the room keys? They trust you with the room already.

      2 replies 0 retweets 0 likes
    6. Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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      Replying to @marshray @chort0 and

      I suppose they mind because they don't want you to have access after you've checked out. Are you saying they might maliciously upload the key, then use it as a backdoor later? If they're malicious, there are so many better ways once you've given them Admin, no?

      1 reply 0 retweets 3 likes
    7. Marsh Ray‏ @marshray 21 Dec 2017
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      Replying to @taviso @chort0 and

      It adds a (literal) key trust/management problem to the easier 'clean the room after checkout' problem.

      2 replies 0 retweets 1 like
    8. Jeffrey Goldberg‏ @jpgoldberg 21 Dec 2017
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      Replying to @marshray @taviso and

      I’ve seen lots of people thinking that public key encryption solves a problem that it doesn’t. They end up storing/exposing a private key kinda near where the public key is used.

      1 reply 0 retweets 1 like
    9. Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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      Replying to @jpgoldberg @marshray and

      So the attack is a well-meaning but incompetent administrator clicks through all the warnings to export private keys, then gives it to an attacker? How do you deal with this attack, an incompetent user clicking through warnings and sharing passwords with an attacker?

      1 reply 0 retweets 0 likes
    10. Jeffrey Goldberg‏ @jpgoldberg 21 Dec 2017
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      Replying to @taviso @marshray and

      I was talking about developer embedding private keys in binaries or local configuration files. You’d be surprised at how many times vet the years people suggested that we just give 1Password’s localhost web socket a server certificate.

      2 replies 0 retweets 1 like
      Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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      Replying to @jpgoldberg @marshray and

      Hmm, but that is the problem Blizzard are trying to solve. They generate a per-machine certificate, so do not have to embed a static private key. That is the correct solution, no?

      5:03 PM - 21 Dec 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Jeffrey Goldberg‏ @jpgoldberg 21 Dec 2017
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          Replying to @taviso @marshray and

          Where is the private key for that certificate supposedly held? I thought it was local to the client (which was the error I was talking about).

          1 reply 0 retweets 0 likes
        3. Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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          Replying to @jpgoldberg @marshray and

          Yes, it's local to the client and only applicable to the machine it's hosted on (it can't be used to attack other machines). If you're compromised an attacker could steal it, but why would they?

          0 replies 0 retweets 0 likes
        4. End of conversation

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