Show HN: GoBox – GO sandbox to run untrusted code

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	Show HN: GoBox – GO sandbox to run untrusted code (github.com)
	6 points by nishit_nm 2305 days ago

1 comments

Stammon 2304 days ago

I'm afraid this tool is very easy to circumvent. It only checks the first argument to a syscall for containing a forbidden path.

But for example openAt gets it's path as the second argument.

http://man7.org/linux/man-pages/man2/openat.2.html

This tool is a nice demo for how to use ptrace in golang. BUT PLEASE CHECK THE CODE BEFORE USING THIS FOR ANYTHING SECURITY RELATED

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Stammon 2304 days ago

Edit: OpenAt is not a valid counterexample since the program checks file descriptors. But e.g renameAt[0] allows to overwrite protected files. There are numerous other options to circumvent that tool too.

[0]: http://man7.org/linux/man-pages/man2/renameat.2.html

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