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dguido's profile
Dan Guido
Dan Guido
Dan Guido
@dguido

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Dan Guido

@dguido

CEO @trailofbits, organizer @EmpireHacking, director @hack_secure. Open DMs.

Brooklyn, NY
trailofbits.com
Joined April 2008

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    1. Dan Guido‏ @dguido Mar 13

      So this http://AMDflaws.com  business... CTS Labs asked us to review their research last week, and sent us a full technical report with PoC exploit code for each set of bugs.

      35 replies 153 retweets 169 likes
      Show this thread
    2. Dan Guido‏ @dguido Mar 13

      Regardless of the hype around the release, the bugs are real, accurately described in their technical report (which is not public afaik), and their exploit code works.

      21 replies 61 retweets 77 likes
      Show this thread
    3. Dan Guido‏ @dguido Mar 13

      I initially responded to their request out of curiosity -- "Hey, do you want to see our new processor bugs before we release them?" "hell yes I do" -- but after their asks continued to grow billed them our week rate for the work.

      7 replies 5 retweets 17 likes
      Show this thread
    4. Dan Guido‏ @dguido Mar 13

      Dan Guido Retweeted Arrigo Triulzi

      I spent all morning talking to reporters, mostly to correct twitter hot takes. Yes, all the flaws require admin privs but all are _flaws_ not expected functionality.https://twitter.com/cynicalsecurity/status/973595697902706688 …

      Dan Guido added,

      Arrigo Triulzi @cynicalsecurity
      Now onto the “vulnerabilities”: 1) MASTERKEY: if you allow unauthorised BIOS updates you are screwed. Threat level: No shit, Sherlock! 2) RYZENFALL: again, loading unauthorised code on the Secure Processor as admin. Threat level: No shit, Sherlock!
      Show this thread
      13 replies 19 retweets 45 likes
      Show this thread
      Dan Guido‏ @dguido Mar 13

      You can find a measured take that includes my commentary on these vulnerabilities from @lorenzoFB @motherboard:https://motherboard.vice.com/en_us/article/kzpm5x/amd-secure-processor-ryzen-epyc-vulnerabilities-and-backdoors …

      11:54 AM - 13 Mar 2018
      • 48 Retweets
      • 61 Likes
      • Craig Arendt Francisco Silva NodePoint 🏆Award Winning🏆🍥 Drizzt Rich Seymour birdlingPlane Adrian Rueegsegger Anthony Shaw
      7 replies 48 retweets 61 likes
        1. New conversation
        2. Dan Guido‏ @dguido Mar 14

          Dan Guido Retweeted Dan Guido

          Adding a FAQ based on the last 24 hours: - "Tell me more about how you were paid"https://twitter.com/dguido/status/973687926692466689 …

          Dan Guido added,

          Dan Guido @dguido
          Replying to @IanCutress
          It was driven by curiosity first and a favor. However, once we received the technical report and fielded their first set of questions, we realized it went beyond a favor. We anticipated 1 bug, not 13, so we asked to get paid.
          2 replies 0 retweets 0 likes
          Show this thread
        3. Dan Guido‏ @dguido Mar 14

          "In a situation like this, would it be common for your firm to discuss disclosure with the vendor?" Yes, and we did. I discussed pros/cons of various options with them and recommended that they report the vulnerabilities to a CERT.

          1 reply 0 retweets 0 likes
          Show this thread
        4. Dan Guido‏ @dguido Mar 14

          Dan Guido Retweeted Dan Guido

          "Were you made aware of the plans to go public?" No.https://twitter.com/dguido/status/973633990639878144 …

          Dan Guido added,

          Dan Guido @dguido
          Replying to @chronic
          I did not see the whitepaper, video, media release, or anything else until a reporter sent it to me. Unlike everyone else, I only had the technical report and none of the media info.
          1 reply 1 retweet 1 like
          Show this thread
        5. Dan Guido‏ @dguido Mar 14

          Dan Guido Retweeted Dan Guido

          "How did CTS Labs find you? What is your relationship to them?" Mutual friend. No ongoing relationship.https://twitter.com/dguido/status/973675763319885825 …

          Dan Guido added,

          Dan Guido @dguido
          Replying to @IanCutress
          They found us through a mutual friend. I had never spoken to them before, and I have no ongoing relationship with them. They sought us out because they were concerned about the validity of their findings.
          3 replies 0 retweets 0 likes
          Show this thread
        6. Dan Guido‏ @dguido Mar 14

          Dan Guido Retweeted Dan Guido

          "Do you have any financial position or interest in AMD or Intel stock?" No.https://twitter.com/dguido/status/973986464789868547 …

          Dan Guido added,

          Dan Guido @dguido
          Replying to @audiemmm
          No, I do all my investing with an automated portfolio from @Betterment. I have no positions on AMD stock, and I have no arrangement to benefit with a 3rd party. Thanks for asking.
          3 replies 1 retweet 4 likes
          Show this thread
        7. Dan Guido‏ @dguido Mar 15

          Dan Guido Retweeted Trail of Bits

          If you're looking for clear, technical information about the flaws then see the blog we just published:https://twitter.com/trailofbits/status/974345028498804737 …

          Dan Guido added,

          Trail of Bits @trailofbits
          We published a technical summary of the "AMD Flaws" so they can be of use to the security community without the distraction of the surrounding disclosure issues. https://blog.trailofbits.com/2018/03/15/amd-flaws-technical-summary/ …
          Show this thread
          1 reply 8 retweets 8 likes
          Show this thread
        8. Dan Guido‏ @dguido Mar 15

          Dan Guido Retweeted OSTIF Official

          This is my favorite take on the AMD Flaws. They are effectively a "jailbreak" for AMD CPUs.https://twitter.com/OSTIFofficial/status/974348788163928064 …

          Dan Guido added,

          OSTIF Official @OSTIFofficial
          Replying to @trailofbits
          Wait, back up for a second... Does this mean that MasterKey provides a way to disable the AMD PSP? Is this the way to @coreboot_org and @libreboot that we have been waiting for?
          4 replies 18 retweets 35 likes
          Show this thread
        9. Dan Guido‏ @dguido Mar 15

          Dan Guido Retweeted

          This is the truest comment anyone has made about my week so far: https://twitter.com/wildcardNP/status/973921044170989568 …

          Dan Guido added,

          This Tweet is unavailable.
          3 replies 1 retweet 7 likes
          Show this thread
        10. Dan Guido‏ @dguido Mar 20

          AMD published an initial technical assessment of the flaws from CTS and, by all indications, it agrees with our own. They even linked to our blog post! https://community.amd.com/community/amd-corporate/blog/2018/03/20/initial-amd-technical-assessment-of-cts-labs-research …

          2 replies 11 retweets 12 likes
          Show this thread
        11. End of conversation
        1. New conversation
        2. Ryan Shrout‏Verified account @ryanshrout Mar 13
          Replying to @dguido @lorenzofb @motherboard

          How would you compare what you saw to Spectre/Meltdown? Is this more or less difficult to address?

          2 replies 0 retweets 0 likes
        3. Dan Guido‏ @dguido Mar 13
          Replying to @ryanshrout @lorenzofb @motherboard

          Meltdown and Spectre required novel research advances. In contrast, all of these latest flaws have been well understood since the 90s. They are not new foundational issues, they are well understood programming flaws.

          0 replies 1 retweet 5 likes
        4. End of conversation
        1. New conversation
        2. Kenn White‏Verified account @kennwhite Mar 13
          Replying to @dguido @lorenzofb

          when they speak of "local machine elevated admin" they mean that in Windows privilege sense, not as in “I have physical possession of your machine", yes?

          1 reply 0 retweets 2 likes
        3. Lorenzo Franceschi-Bicchierai‏Verified account @lorenzofb Mar 13
          Replying to @kennwhite @dguido

          Yes. Researchers told me there's no need for physical access.

          1 reply 0 retweets 5 likes
        4. Kenn White‏Verified account @kennwhite Mar 13
          Replying to @lorenzofb @dguido

          thanks. Yeah, that was a pretty awful white paper.

          0 replies 1 retweet 3 likes
        5. End of conversation
        1. New conversation
        2. Collin Mulliner‏Verified account @collinrm Mar 13
          Replying to @dguido @lorenzofb @motherboard

          It would be awesome if cpu manufacturers would allow turning off all those extra features or sell a version that is just a cpu. Same for chipset features.

          2 replies 3 retweets 8 likes
        3. Amper Sine‏ @ampersine Mar 13
          Replying to @collinrm @dguido and

          Whichever one of them supplies DOD must sell something without all the bells and whistles, I figure

          1 reply 0 retweets 0 likes
        4. Collin Mulliner‏Verified account @collinrm Mar 13
          Replying to @ampersine @dguido and

          Well it’s documented that ME can be turned off for them.

          1 reply 0 retweets 1 like
        5. Hamid Kashfi‏ @hkashfi Mar 13
          Replying to @collinrm @ampersine and

          Intel ships non ME versions (usually in form of K series that lack vPro). I'm not sure though that's only for i-series or Xeon processors also are available in ME-free models.

          1 reply 0 retweets 2 likes
        6. olle@nxs.se‏ @nxsolle Mar 13
          Replying to @hkashfi @collinrm and

          Are you confusing ME and AMT? As I understood it all intel processors have ME (used for fan control, etc.) but only vPro-branded ones run AMT?

          2 replies 0 retweets 0 likes
        7. Collin Mulliner‏Verified account @collinrm Mar 13
          Replying to @nxsolle @hkashfi and

          I bet

          0 replies 0 retweets 0 likes
        8. End of conversation

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