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jonasLyk's profile
Jonas L
Jonas L
Jonas L
@jonasLyk

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Jonas L

@jonasLyk

viking @the_secret_club

Joined February 2015

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    1. Kevin Beaumont‏Verified account @GossiTheDog Jul 26
      Replying to @gentilkiwi @msftsecurity

      bingo you can do some really problematic things with it

      1 reply 1 retweet 9 likes
    2. Mitja Kolsek‏ @mkolsek Jul 26
      Replying to @GossiTheDog @gentilkiwi @msftsecurity

      Accepting unauthenticated requests is clearly against the specification, but in a typical phishing scenario, the attacker always has credentials of the phished user. The thing is broken even if authentication was required.

      1 reply 0 retweets 4 likes
    3.  🥝 Benjamin Delpy‏Verified account @gentilkiwi Jul 26
      Replying to @mkolsek @GossiTheDog @msftsecurity

      Completely. But @msftsecurity focus on others subject and doesn't make statements about [MS-EFSR]

      1 reply 0 retweets 7 likes
    4. Mitja Kolsek‏ @mkolsek Jul 26
      Replying to @gentilkiwi @GossiTheDog @msftsecurity

      Yes, and a good catch too in their documentation. It will be hard to justify NOFIX in face of this.

      1 reply 0 retweets 3 likes
    5. Mitja Kolsek‏ @mkolsek Jul 26
      Replying to @mkolsek @gentilkiwi and

      I'm trying to understand the use case for the EfsRpcOpenFileRaw call. Who is supposed to make this call and on what kind of UNC path?

      1 reply 0 retweets 1 like
    6.  🥝 Benjamin Delpy‏Verified account @gentilkiwi Jul 26
      Replying to @mkolsek @GossiTheDog @msftsecurity

      Backups :)

      1 reply 0 retweets 2 likes
    7. Kevin Beaumont‏Verified account @GossiTheDog Jul 26
      Replying to @gentilkiwi @mkolsek @msftsecurity

      yep it's a backup feature ignores file locks, too

      1 reply 1 retweet 2 likes
    8. Mitja Kolsek‏ @mkolsek Jul 26
      Replying to @GossiTheDog @gentilkiwi @msftsecurity

      Thanks! So if we break this in any way, we break backup? Is this then completely broken by design then and literally couldn't be patched by MS?

      2 replies 0 retweets 1 like
    9. Kevin Beaumont‏Verified account @GossiTheDog Jul 26
      Replying to @mkolsek @gentilkiwi @msftsecurity

      You can retrieve files via that RPC call, unauthenticated. There's also a function to encrypt files... and remove decryption metadata.

      2 replies 1 retweet 4 likes
    10. Mitja Kolsek‏ @mkolsek Jul 26
      Replying to @GossiTheDog @gentilkiwi @msftsecurity

      So which user account is making this call in a legitimate scenario? Backup operator?

      1 reply 0 retweets 0 likes
      Jonas L‏ @jonasLyk Jul 26
      Replying to @mkolsek @GossiTheDog and

      Normal flow is that first NTFS connects to lsass through an ALPC port. LSASS Then impersonates the caller and open the file to operate on. It opens with only FILE_READ_ATTRIBUTTE though it will then do IOCTLS that read and write anyway. ifsutilx.dll will handle the requests and

      10:50 AM - 26 Jul 2021
      • 3 Likes
      • `Ivan Mitja Kolsek Kevin Beaumont
      2 replies 0 retweets 3 likes
        1. Jonas L‏ @jonasLyk Jul 26
          Replying to @jonasLyk @mkolsek and

          verify that the process of the calling thread have TCB . Unless of course encryption must be done and there is no private key assigned for the user.... Then lsass also generate that first

          0 replies 0 retweets 2 likes
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        1. New conversation
        2. Jonas L‏ @jonasLyk Jul 26
          Replying to @jonasLyk @mkolsek and

          i also stubled upon this... Ive alvays knew it was a lie https://support.microsoft.com/en-us/windows/how-reserved-storage-works-in-windows-10-5bc98443-0711-8038-4621-6a18ddc904f2 …

          1 reply 0 retweets 1 like
        3. Jonas L‏ @jonasLyk Jul 26
          Replying to @jonasLyk @mkolsek and

          to me it looks more like a place to stash the telemetric data- you cant submit data when bsod.....pic.twitter.com/PcHbK8LxgN

          0 replies 0 retweets 1 like
        4. End of conversation

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