Skip to content
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

Tweets

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

Tweets

  • © 2018 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. 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
    2. 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
    3. 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
    4. 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
    5. 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
    6. 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...

      1 reply 0 retweets 2 likes
    7. 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
    8. Rich Felker‏ @RichFelker Apr 12
      Replying to @CopperheadOS @matthew_d_green @chadloder

      Seems like the port shouldn't even be active for data (charging only) when the phone is locked. Anyone wanna bet they enabled it for headphones since they removed the headphone jack? ;-)

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

      It definitely supports more than charging in that case, as do Android phones. The move to Lightning / USB C headphones does genuinely make it less convenient to do something like https://github.com/CopperheadOS/platform_frameworks_base/commit/7b811853c5d2b05ec5db11786ab3f4b6a079e1a1 … but there are a lot of other reasons for them using data at that point.

      1 reply 0 retweets 2 likes
    10. CopperheadOS‏ @CopperheadOS Apr 12
      Replying to @CopperheadOS @RichFelker and

      One simple example is supporting USB keyboards and various accessibility technology. Some of that may be needed by someone to unlock the screen. Accessibility support often ends up being a security problem, not familiar with how accessibility services work on iOS though.

      3 replies 0 retweets 1 like
      Rich Felker‏ @RichFelker Apr 12
      Replying to @CopperheadOS @matthew_d_green @chadloder

      Seems they could/should only support Bluetooth, and only devices that are already paired when unlocked. Lightning is a much much bigger attack surface.

      4:55 PM - 12 Apr 2018
      • 1 Like
      • John 🇺🇸🤓🤖💎💳✈️🖥💻📱🚙🔋
      1 reply 0 retweets 1 like
        1. New conversation
        2. Chad Loder  ❇️‏ @chadloder Apr 12
          Replying to @RichFelker @CopperheadOS @matthew_d_green

          This logic requires code to execute, and that is likely where the flaw lives.

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

          There's no reason the data lines couldn't be electronically gated to a dumb charging controller chip while locked. Would eliminate non-invasive physical attacks.

          2 replies 0 retweets 1 like
        4. Chad Loder  ❇️‏ @chadloder Apr 12
          Replying to @RichFelker @CopperheadOS @matthew_d_green

          I’ve seen USB driver code at both the OS and micro-controller level - it’s not pretty. You’d be surprised how many special cases are required just to negotiate charging.

          1 reply 5 retweets 21 likes
        5. Rich Felker‏ @RichFelker Apr 12
          Replying to @chadloder @CopperheadOS @matthew_d_green

          Yes but that logic has no need to interact with OS or security processor logic. Can be completely isolated.

          1 reply 0 retweets 1 like
        6. Chad Loder  ❇️‏ @chadloder Apr 12
          Replying to @RichFelker @CopperheadOS @matthew_d_green

          That would be interesting, and it would also be something not called USB.

          2 replies 0 retweets 1 like
        7. Rich Felker‏ @RichFelker Apr 12
          Replying to @chadloder @CopperheadOS @matthew_d_green

          Sure it's USB (or rather USB over lightning). It's just 2+ separate logical USB devices, and which is connected is gated by lock state of the phone.

          1 reply 0 retweets 0 likes
        8. Chad Loder  ❇️‏ @chadloder Apr 12
          Replying to @RichFelker @CopperheadOS @matthew_d_green

          This starts to become a highly specialized phone that is useless when locked. Might as well turn off bluetooth, wifi, and push notifications while locked. How is this isolated set of chips going to know when the phone is unlocked? Who is going to signal it?

          1 reply 0 retweets 2 likes
        9. Rich Felker‏ @RichFelker Apr 12
          Replying to @chadloder @CopperheadOS @matthew_d_green

          Software can switch it all when entering locked state. I've actually never used my phone's USB port for anything but charging & initial OS install so it hardly seems "useless" to me.

          2 replies 0 retweets 0 likes
        10. 9 more replies

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2018 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Cookies
        • Ads info