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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

      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
    2. 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
    3. 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
    4. 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
    5. 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
    6. Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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      Replying to @marshray @chort0 and

      I don't see how, describe the attack to me? We're on the same page here that this is a trusted process generating a per-machine certificate, right? If you have an attack against this that doesn't require Administrator, that would be huge - this is really common.

      1 reply 0 retweets 4 likes
    7. Marsh Ray‏ @marshray 21 Dec 2017
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      Replying to @taviso @chort0 and

      No, just looking at this as an opportunity to lessen privilege.

      1 reply 0 retweets 0 likes
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    9. Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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      Replying to @4Dgifts @marshray and

      It's not necessary, but as any attack against it would require Administrator, at which point the attacker just add their own CA certificate, or just nop out all certificate verification...what does it matter? Maybe it would be cleaner, but there's no security issue here.

      3 replies 0 retweets 2 likes
    10. Mitja Kolsek‏ @mkolsek 21 Dec 2017
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      Replying to @taviso @4Dgifts and

      Am I correct in understanding that the problem being solved here is HTTPS communication with localhost? Because if so, who is the would-be attacker?

      1 reply 0 retweets 0 likes
      Tavis Ormandy‏Verified account @taviso 21 Dec 2017
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      Replying to @mkolsek @4Dgifts and

      They want to avoid mixed-content warnings in browsers. There is no network attacker in the current implementation.

      5:01 PM - 21 Dec 2017
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        1. Mitja Kolsek‏ @mkolsek 21 Dec 2017
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          Replying to @taviso @4Dgifts and

          Okay, that makes sense.

          0 replies 0 retweets 0 likes
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