Show HN: GoBox – GO sandbox to run untrusted code

Show HN: GoBox – GO sandbox to run untrusted code(github.com)

6 points by nishit_nm 6 years ago | 2 comments

Stammon 6 years 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

Stammon 6 years 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