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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 16 Jan 2020
      • Report Tweet
      • Report NetzDG Violation

      To clarify the Windows crypto fail: The problem isn't in signature validation. The problem is the *root store/cache*. CryptoAPI considers an (attacker-supplied) root CA to be in the trust store if its public key and serial match a cert in the root store, Ignoring curve params.

      11 replies 203 retweets 528 likes
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    2. Hector Martin‏ @marcan42 16 Jan 2020
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      So it's not that Windows uses the wrong curve parameters or anything like that, it's that at some point the key used to index into a validated cert cache is (serial, pub) when it should be (serial, pub, params). As they say, one of the hardest problems in CS is caching.

      10 replies 37 retweets 172 likes
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    3. Tavian Barnes‏ @tavianator 16 Jan 2020
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      Replying to @marcan42

      Why are the params not part of the serial?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 16 Jan 2020
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      Replying to @tavianator

      What do the params have to do with the serial? The serial is just an arbitrary serial number.

      7:51 AM - 16 Jan 2020
      1 reply 0 retweets 0 likes
        1. Tavian Barnes‏ @tavianator 16 Jan 2020
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          Replying to @marcan42

          Oh I figured it was some kind of hash

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