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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
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      • 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. Rohit Mothe‏ @rohitwas 17 Jan 2020
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      Replying to @marcan42

      Maybe I'm missing something but based on my tests it seems that even the serial doesn't need to be the same? Just a public key match seems enough to trigger it

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 17 Jan 2020
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      Replying to @rohitwas

      Could be, the PoC I saw was explicitly cloning the serial so I assumed that much was needed.

      1 reply 0 retweets 2 likes
    5. Rohit Mothe‏ @rohitwas 17 Jan 2020
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      Replying to @marcan42

      Yeah, I do remember some article also mentioning the serial match requirement. But I was just able to spoof a valid code sign certificate and the serial definitely doesn't match with the root cert

      2 replies 0 retweets 1 like
      Hector Martin‏ @marcan42 17 Jan 2020
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      Replying to @rohitwas

      Does it also work for TLS? Maybe it's different.

      11:50 AM - 17 Jan 2020
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