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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Matthew Green‏ @matthew_d_green Apr 12

      We live in a world where all phone device encryption is (inexpensively) broken, and yet the FBI is making a renewed push for crypto backdoors. What exactly are they thinking?https://motherboard.vice.com/en_us/article/vbxxxd/unlock-iphone-ios11-graykey-grayshift-police …

      9 replies 87 retweets 124 likes
      Show this thread
    2. Chad Loder  ❇️‏ @chadloder Apr 12
      Replying to @matthew_d_green

      Matt, is there any writeup on how GrayKey works? It’s interesting that they have an ex-Apple security engineer on staff.

      2 replies 1 retweet 5 likes
    3. Matthew Green‏ @matthew_d_green Apr 12
      Replying to @chadloder

      Nobody knows. It’s literally a black box. Obviously it uses some kind of Lightning exploit that disables throttling and security checks that the SEP is supposed to perform. But who knows.

      2 replies 1 retweet 6 likes
    4. Rich Felker‏ @RichFelker Apr 12
      Replying to @matthew_d_green @chadloder

      Someone should mod an iPhone (sw or physically) to log and exfiltrate the attack and leave if where some incompetent & overfunded local LE will plug it in one of these.

      1 reply 0 retweets 3 likes
    5. CopperheadOS‏ @CopperheadOS Apr 12
      Replying to @RichFelker @matthew_d_green @chadloder

      They might have other vulnerabilities stockpiled which would explain why they're being so brazen about it rather than trying to protect their exploit from getting leaked and fixed.

      2 replies 1 retweet 9 likes
    6. Rich Felker‏ @RichFelker Apr 12
      Replying to @CopperheadOS @matthew_d_green @chadloder

      Seems doubtful that they have more than one that works without even taking apart the phone. This one is really bad and Apple should be able to figure it out without seeing it...

      2 replies 0 retweets 4 likes
      Rich Felker‏ @RichFelker Apr 12
      Replying to @RichFelker @CopperheadOS and

      Of course they likely know they have an utterly wrong hardware topology in that the lightning port has any kind of access to the locked-down chips, but that's probably not easy for them to fix...

      4:26 PM - 12 Apr 2018
      • 2 Likes
      • Karel 3d Albert Lunde
      1 reply 0 retweets 2 likes
        1. New conversation
        2. CopperheadOS‏ @CopperheadOS Apr 12
          Replying to @RichFelker @matthew_d_green @chadloder

          It probably doesn't have direct access. They could be exploiting the OS and then escalating to SEP access with another exploit. It's impossible to know exactly what they're doing. SEP provides a lot more than the disk encryption hardware support so there's other attack surface.

          2 replies 0 retweets 4 likes
        3. Matthew Green‏ @matthew_d_green Apr 12
          Replying to @CopperheadOS @RichFelker @chadloder

          It’s almost certainly a chain of exploits. They must have reasonable confidence that they have diversity of options at each point, if they’re putting the box in the hands of state and local cops.

          1 reply 0 retweets 4 likes
        4. CopperheadOS‏ @CopperheadOS Apr 12
          Replying to @matthew_d_green @RichFelker @chadloder

          Google has a bigger version of this attack surface problem for the TEE which is part of why they started splitting it up. For example, they decided to support a separate HSM for the hardware-backed keystore in Android P:https://developer.android.com/preview/features/security.html#secure-key-import …

          1 reply 0 retweets 2 likes
        5. CopperheadOS‏ @CopperheadOS Apr 12
          Replying to @CopperheadOS @matthew_d_green and

          It's somewhat amusing. These hardware security features are usable for all kinds of things so they get feature creep and then there's a fairly big software stack running there with a lot of attack surface. Main reason they're useful is tiny attack surface compared to the OS.

          0 replies 0 retweets 2 likes
        6. End of conversation

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