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Date: Sat, 24 Jul 2021 12:32:34 -0400
From: Michael Orlitzky <>
Subject: Re: Potential symlink attack in python3 __pycache__

On Sat, 2021-07-24 at 18:33 +0300, Georgi Guninski wrote:
> Not sure if this is vulnerability, but it looks like
> classical symlink attack.
> In python3, if a script in directory DIR1 does "import another",
> then python3 creates directory __pycache__ in DIR1 and puts
> some files in __pycache__.
> According to our tests, if DIR1/__pycache__ is symlink to something,
> then python3 follows the symlink.

When subdirectories of DIR1 are writable by anyone other than the
person running the script, you have a bunch of problems:

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