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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 11 Jun 2020
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      TIL that on windows, cmd.exe /c implements a CVE for you by default, by automagically interpreting any passed *command line* as a *filename with spaces*. You need to pass /s to turn off the free CVE. So cmd /c "ping http://evil.‌com/../../../../../../windows/calc.exe" pops calc.

      8 replies 40 retweets 159 likes
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    2. Hector Martin‏ @marcan42 11 Jun 2020
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      Wine implements it too, here's the pile of automagic nonsense that you need to explicitly turn off: https://github.com/wine-mirror/wine/blob/master/programs/cmd/wcmdmain.c#L2586 … Yes it literally is taking the entire command, spaces and all, and trying it as a single space-containing file path before actually trying it as a command

      1 reply 3 retweets 27 likes
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    3. Hector Martin‏ @marcan42 11 Jun 2020
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      Here are the MS docs on this behavior, which are almost incomprehensible:https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/cmd …

      4 replies 1 retweet 21 likes
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    4. Random832‏ @Random832 11 Jun 2020
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      Replying to @marcan42

      Well, to be *perfectly* fair, quotes around the command line aren't required, so I think it's assuming you meant this [which also opens calc]. Still, being able to do it with a nonexistent path is a bit shocking. And it goes against how most programs process arguments.pic.twitter.com/19mEFrPpYC

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @Random832

      But it's inconsistent. You can put quotes around a command line with space separated arguments and it'll interpret it as a command line, if an executable of the same name as the whole doesn't exist. Its different from how the normal interactive parsing works.

      1 reply 0 retweets 0 likes
    6. Random832‏ @Random832 11 Jun 2020
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      Replying to @marcan42

      sure, but those cases are it allowing unnecessary quotes. as far as I can tell there aren't any cases where quotes that aren't meant as part of the command are helpful.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 11 Jun 2020
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      Replying to @Random832

      But what if the quotes *are* necessary then, and you want to start a program with spaces in the filename? Then if that file does not exist it'll fall back to potentially running something else. Either way you look at it, this automagic behavior is wrong.

      7:17 PM - 11 Jun 2020
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