GNU bug report logs - #41619
[PATCH] Mark python-shell-virtualenv-root as safe local variable

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>, "Philip K." <philip <at> warpmail.net>
Cc: 41619 <at> debbugs.gnu.org, philip.kaludercic <at> fau.de
Subject: bug#41619: [PATCH] Mark python-shell-virtualenv-root as safe local variable
Date: Mon, 15 Jun 2020 21:53:50 +0300

> From: Glenn Morris <rgm <at> gnu.org>
> Date: Sat, 13 Jun 2020 13:20:29 -0400
> Cc: eliz <at> gnu.org, philip.kaludercic <at> fau.de
> 
> 
> I don't understand how python-shell-virtualenv-root can be considered a
> safe local variable. Surely it controls what "python" executable gets run.
> 
> As a test, I did:
> 
> python3 -m venv /tmp/foo
> 
> I then replaced /tmp/foo/bin/python with a shell-script:
> 
>  #!/bin/bash
>  echo oh-oh
> 
> I then ran:
> emacs -Q --eval '(setq python-shell-virtualenv-root "/tmp/foo")' -f python-mode
> C-c C-p
> 
> This gives an inferior Python buffer with contents:
> 
>   oh-oh
> 
>   Process Python finished
> 
> In other words, this looks like a recipe for arbitrary code execution.

Philip, could you please look into this?  TIA.

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