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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 3 Jan 2019
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      Anyway, if you rely on BitLocker in TPM mode (boot without PIN), you should know that anyone can steal your computer, sniff 32 bytes off of the LPC bus, stick them into libbde, and decrypt your disk. Yes, it's that easy. Solder 7 wires to $favorite_fpga_board, decrypt drive.

      29 replies 614 retweets 1,105 likes
      Show this thread
    2. Mickey‏ @HackingThings 3 Jan 2019
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      Replying to @marcan42 @depletionmode

      I wish chassis intrusion detection would wipe the tpm automatically

      5 replies 0 retweets 15 likes
    3. Paweł Lasek‏ @pawel_lasek 4 Jan 2019
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      Replying to @HackingThings @marcan42 @depletionmode

      Thinkpads do that, don't recall since which version but I think my X230 already had it

      1 reply 0 retweets 1 like
    4. Hector Martin‏ @marcan42 4 Jan 2019
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      Replying to @pawel_lasek @HackingThings @depletionmode

      Um, how? TPMs aren't HSMs, they are not battery-backed. How is the laptop going to detect a chassis intrusion without power? Using the CMOS battery? And then what, powering up the TPM and somehow issuing a wipe command all from that 3V cell? This all sounds implausible.

      1 reply 0 retweets 0 likes
    5. Paweł Lasek‏ @pawel_lasek 4 Jan 2019
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      Replying to @marcan42 @HackingThings @depletionmode

      Some TPM chips keep enough stored charge to act on chassis intrusion and wipe themselves

      0 replies 0 retweets 0 likes
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    7. Hector Martin‏ @marcan42 4 Jan 2019
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      Replying to @Serianox_ @pawel_lasek and

      Which TPM is this? All the ones I know of are EEPROM based and require no power.

      0 replies 0 retweets 0 likes
    8. This Tweet is unavailable.
    9. Hector Martin‏ @marcan42 4 Jan 2019
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      Replying to @Serianox_ @pawel_lasek and

      There is no mention of battery backup anywhere in the datasheet for SLB9635TT1.2 (typical Infineon TPM). The only mention of batteries in the TPM 1.2 specification is about timestamping/clock, and it's optional.

      0 replies 0 retweets 0 likes
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      Hector Martin‏ @marcan42 4 Jan 2019
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      Replying to @Serianox_ @pawel_lasek and

      You need a battery to do *anything* when powered off. Without a battery chassis intrusion detection is useless as a defense against hardware modification attacks like the one I described.

      4:53 AM - 4 Jan 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        1.  🏳️‍🌈JOHN WOLF CONNOR 🏳️‍🌈‏ @connorfgws 6 Jan 2019
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          Replying to @marcan42 @Serianox_ and

          So what a cmos battery to save the bios settings or do u mean now battery to reset the settings?

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 6 Jan 2019
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          Replying to @connorfgws @Serianox_ and

          Look, this isn't rocket science. A computer without a battery cannot possibly detect that you've opened the case while powered off (and do something about it like destroy encryption keys).

          1 reply 0 retweets 0 likes
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