oss-security - Re: ipython3 may execute code from the current working directory

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Message-ID: <20210722113545.hewzinrjmy7jon6c@jwilk.net>
Date: Thu, 22 Jul 2021 13:35:45 +0200
From: Jakub Wilk <jwilk@...lk.net>
To: <oss-security@...ts.openwall.com>
Subject: Re: ipython3 may execute code from the current
 working directory

* Georgi Guninski <gguninski@...il.com>, 2021-07-22, 11:52:
>Summary: under certain circumstances, ipython3 may execute code from 
>the current working directory.

Looks like this might be intentional? Or at least there's an option to 
turn off this behavior:

https://github.com/ipython/ipython/blob/7.25.0/IPython/core/shellapp.py#L219
https://ipython.readthedocs.io/en/stable/config/options/kernel.html#configtrait-InteractiveShellApp.ignore_cwd

However, in some Debian packages (at least 5.8.0-1 from Debian buster), 
even --ignore-cwd doesn't help, because /usr/bin/python3 looks like 
this:

   VERSION="3"
   if [ ! -f /usr/bin/python$VERSION ]
   then
           echo "Please install the python$VERSION package." >&2
           exit 1
   else
           exec python$VERSION -c "import sys; sys.argv[0] = '/usr/bin/ipython$VERSION'; from IPython.terminal.ipapp import launch_new_instance; launch_new_instance()" "$@"
   fi

But "python3 -c" adds cwd to sys.path.

-- 
Jakub Wilk

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