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Avoiding Interpreter Spoofing in bash
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Avoiding Interpreter Spoofing in bash

InfinityCoder February 21, 2017

You want to avoid certain kinds of setuid root spoofing attacks.

Pass a single trailing dash to the shell, as in: #!/bin/bash –

The first line of a script is a magic line (often called the shebang line) that tells the kernel what interpreter to use to process the rest of the file.

The kernel will also look for a single option to the specified interpreter.

There are some attacks that take advantage of this fact, but if you pass an argument along, they are avoided.

See http://www.faqs.org/faqs/unix-faq/faq/part4/section-7.html for details.

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