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A comment on Show HN: GoBox – GO sandbox to run untrusted code.

Re:Show HN: GoBox – GO sandbox to run untrusted code by Stammon on Friday April 10, 2020 @04:30PM (#22837044)
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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Re:Show HN: GoBox – GO sandbox to run untrusted code by Stammon on Friday April 10, 2020 @04:43PM (#22837149)
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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