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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. Tom Van de Wiele‏ @0xtosh 13 Jul 2020

      Tom Van de Wiele Retweeted Jonas L

      Reminds me of the lock-up bug from the early 00s where specifying DOS era device names would lock up your system. This is still the reason you can't make directories on your Windows system called aux, con, lpt1 etc: https://www.helpndoc.com/documentation/html/Windowsreservedfilenames.html … Old school: https://packetstormsecurity.com/files/10178/SCX-SA-01.txt.html …https://twitter.com/jonasLyk/status/1282538733506568197 …

      Tom Van de Wiele added,

      Jonas L @jonasLyk
      Everybody knows that you can open a file. But did you know if you open the file: C:\$Secure:$ATTRIBUTE_LIST:$ATTRIBUTE_LIST with FILE_READ_ATTRIBUTES your system will lock totally up? The sharedFcb lock get aquired twice resulting in death of the system.
      Show this thread
      1 reply 0 retweets 1 like
      Show this thread
    2. Tom Van de Wiele‏ @0xtosh 13 Jul 2020

      Still kind of works to find DoS cases. If you have software that takes in data & allows the filename to be specified by the end-user, then when it gets written out to disk using one of those illegal names it can cause lock-ups if the author didn't do proper exception handling.

      1 reply 0 retweets 0 likes
      Show this thread
      Jonas L‏ @jonasLyk 13 Jul 2020
      Replying to @0xtosh

      Jonas L Retweeted Jonas L

      incredible not all have been found of this kinda bug... but- the old names are still very powerfull, like you can do this:https://twitter.com/jonasLyk/status/1261747345806499841 … or simply delete \GLOBAL??\nul and replace with what you want. now win32 path nul resolves to whatever :)

      Jonas L added,

      Jonas L @jonasLyk
      By creating a symbolic link \??\NUL -> \??\c:\windows\write.exe Opening NUL anywhere on your harddrive opens write.exe as your profile. pic.twitter.com/3CIQpeYAxi
      2:29 AM - 13 Jul 2020
      1 reply 0 retweets 0 likes
        1. Tom Van de Wiele‏ @0xtosh 13 Jul 2020
          Replying to @jonasLyk

          It gets sticky pretty fast. Filenames are still an Achilles heel for Windows because of its legacy. The fact that Microsoft Office still can't open two files with the same filename still baffles me.

          0 replies 0 retweets 0 likes
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