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Message-ID: <85b3215f-530e-a698-ac60-57a03763fd3b@wichmann.us>
Date: Fri, 23 Jul 2021 14:39:33 -0600
From: Mats Wichmann <mats@...hmann.us>
To: oss-security@...ts.openwall.com
Subject: Re: ipython3 may execute code from the current working
directory
On 7/22/21 5:35 AM, Jakub Wilk wrote:
> * 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
normally (cpython), an empty string in sys.path doesn't mean "current
directory", it means "script directory", the directory the script you're
running is found in [1]. that only falls back to current directory in
case there is no script directory - which happens if you invoke the
interpreter interactively . So maybe ipython isn't interpreting this the
same way?
there have been more than one security concern about the way this makes
it possible for untrusted modules to get loaded.
[1] https://docs.python.org/3/library/sys.html#sys.path
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