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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. gweeperx‏ @gweeperx 19 Feb 2020

      I have a bug where a user can create a file anywhere. This file: 1.can have any name/ext 2.will be empty 3.must not exist. E.g you can't create c:\windows\win.ini 4. You can't edit it I can DOS.Other ideas you would like to share? /cc: @SandboxBear , @decoder_it , @tiraniddo

      11 replies 0 retweets 8 likes
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    3. Jonas L‏ @jonasLyk 19 Feb 2020
      Replying to @SandboxBear @gweeperx and

      https://docs.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-redirection … The contents of a redirection file are ignored, but its presence causes Windows to check the application directory first whenever it loads a DLL, regardless of the path specified to LoadLibrary or LoadLibraryEx.

      2 replies 0 retweets 3 likes
    4. Jonas L‏ @jonasLyk 19 Feb 2020
      Replying to @jonasLyk @SandboxBear and

      That is the only case where I can see an not content controllable file creation vulnerability being usefull. Remember, a file creation vuln is also a directory creation vuln. Just append ::$INDEX_ALLOCATION

      1 reply 0 retweets 2 likes
    5. Jonas L‏ @jonasLyk 19 Feb 2020
      Replying to @jonasLyk @SandboxBear and

      I Just got an idea.... You can create an alternative data stream on the primary hard drive root C:\:stream:$data - then afterwards you can open the file with FILE_APPEND_DATA because of FILE_APPEND_DATA S-1-5-11 (NT AUTHORITY\Authenticated Users)

      2 replies 0 retweets 3 likes
    6. James Forshaw‏ @tiraniddo 19 Feb 2020
      Replying to @jonasLyk @SandboxBear and

      That would certainly work assuming it's not setting some super restrictive ACL explictly though. Of course you'd still need to find something useful to do with that primitive :-(

      2 replies 0 retweets 0 likes
    7. Jonas L‏ @jonasLyk 19 Feb 2020
      Replying to @tiraniddo @SandboxBear and

      Wait...help me think here :) If ACL in createfile call- nothing will happen, as we are not creating a new file- right? If a SetSecurity call on the Handle, then we may have a vuln exploitable by: hardlink c:\windows\target.exe -> c:\folder\file make folder inheret good acl to fil

      1 reply 0 retweets 1 like
      Jonas L‏ @jonasLyk 19 Feb 2020
      Replying to @jonasLyk @tiraniddo and

      then redirect the privelegied filecreatecall to c:\folder\file:stream:$data When setsecurity is called on stream the file will inherit from holder- refelecting to target file.....right?

      4:38 PM - 19 Feb 2020
      • 1 Like
      • Terry Thibault
      0 replies 0 retweets 1 like

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