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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 14 May 2018
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      GPZ> So we found these vulns related to CPU specula- Academia> ME ME ME TOO ALSO HERE'S A NAME AND A LOGO THE WORLD IS ENDING!!! Cure53> So Enigmail has some issue- Academia> OMG PGP IS DEAD EVERYONE STOP USING IT NOW ALSO NAME AND A LOGO!!! Starting to notice a pattern here.

      6 replies 64 retweets 181 likes
    2. Matthew Green‏ @matthew_d_green 17 May 2018
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      Replying to @marcan42

      Did Cure53 get arbitrary plaintext exfiltration across many clients? Serious question. I missed this result. Link?

      1 reply 0 retweets 6 likes
    3. Hector Martin‏ @marcan42 17 May 2018
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      Replying to @matthew_d_green

      "Arbitrary" is, er, rather generous. But sure, Cure53 didn't get the automated exfiltration, but did set the stage with the partial decryption story. My point is rather about the FUD that academic security teams seem to be rather prone to lately.

      2 replies 0 retweets 7 likes
    4. Matthew Green‏ @matthew_d_green 17 May 2018
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      Replying to @marcan42

      I would go further: the fact that you can maul encrypted PGP emails in various ways was known well before Cure53. It’s been known since the late 1990s. But nobody has ever taken it seriously enough to comprehensively address it across all clients. Guess why?

      2 replies 1 retweet 7 likes
    5. Hector Martin‏ @marcan42 17 May 2018
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      Replying to @matthew_d_green

      IMO, because active content in e-mails is an ancient horse that has been beaten to death and the fact that this is *still* a problem just demonstrates a pervasive failure of email clients to take privacy seriously, PGP completely aside.

      1 reply 0 retweets 8 likes
    6. Matthew Green‏ @matthew_d_green 17 May 2018
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      Replying to @marcan42

      This isn’t just about active content. It’s about the fact that active content can be subtly and comprehensively inserted into encrypted emails using very sophisticated cryptographic techniques, AND that content can be made to exfiltrate other encrypted portions of the data.

      2 replies 0 retweets 9 likes
    7. Matthew Green‏ @matthew_d_green 17 May 2018
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      Replying to @matthew_d_green @marcan42

      When you simplify it to “active content” you do a disservice to both the cryptographic sophistication of the attack AND the severity of the vuln (particularly for S/MIME). This is why things don’t ever get fixed.

      1 reply 1 retweet 2 likes
      Hector Martin‏ @marcan42 17 May 2018
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      Replying to @matthew_d_green

      I'm not considering S/MIME here at all since most of the FUD seems to be about PGP. I couldn't care less about S/MIME and have not analyzed that vector.

      5:05 AM - 17 May 2018
      1 reply 0 retweets 0 likes
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        2. Matthew Green‏ @matthew_d_green 17 May 2018
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          Replying to @marcan42

          The PGP vector is bad enough.

          1 reply 0 retweets 1 like
        3. Matthew Green‏ @matthew_d_green 17 May 2018
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          Replying to @matthew_d_green @marcan42

          Also: let me be clear. “I can fully decrypt your encrypted PGP emails with almost no user interaction” is not FUD. If you doubt the vuln exists, say so. But don’t say it’s not extremely serious for a crypto vuln.

          1 reply 0 retweets 3 likes
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