oss-security - Django: CVE-2021-44420: Potential bypass of an upstream access control based on URL paths

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Date: Tue, 7 Dec 2021 08:44:56 +0100
From: Mariusz Felisiak <felisiak.mariusz@...il.com>
To: oss-security@...ts.openwall.com
Subject: Django: CVE-2021-44420: Potential bypass of an upstream access
 control based on URL paths

https://www.djangoproject.com/weblog/2021/dec/07/security-releases/

In accordance with `our security release policy
<https://docs.djangoproject.com/en/dev/internals/security/>`_, the 
Django team
is issuing
`Django 3.2.10 <https://docs.djangoproject.com/en/dev/releases/3.2.10/>`_,
`Django 3.1.14 
<https://docs.djangoproject.com/en/dev/releases/3.1.14/>`_, and
`Django 2.2.25 <https://docs.djangoproject.com/en/dev/releases/2.2.25/>`_.
These release addresses the security issue detailed below. We encourage all
users of Django to upgrade as soon as possible.

CVE-2021-44420: Potential bypass of an upstream access control based on 
URL paths
=================================================================================

HTTP requests for URLs with trailing newlines could bypass an upstream 
access
control based on URL paths.

This issue has low severity, according to the Django security policy.

Thanks to Sjoerd Job Postmus and TengMA(@te3t123) for the report.

Affected supported versions
===========================

* Django main branch
* Django 4.0 (which will be released in a separate blog post later today)
* Django 3.2
* Django 3.1
* Django 2.2

Resolution
==========

Patches to resolve the issue have been applied to Django's main branch and
the 4.0, 3.2, 3.1, and 2.2 release branches. The patches may be obtained 
from the following changesets:

* On the `main branch 
<https://github.com/django/django/commit/d4dcd5b9dd9e462fec8220e33e3e6c822b7e88a6>`__
* On the `4.0 release branch 
<https://github.com/django/django/commit/20b9ad36ff0558b819659a10a9734262367750be>`__
* On the `3.2 release branch 
<https://github.com/django/django/commit/333c65603032c377e682cdbd7388657a5463a05a>`__
* On the `3.1 release branch 
<https://github.com/django/django/commit/22bd17488159601bf0741b70ae7932bffea8eced>`__
* On the `2.2 release branch 
<https://github.com/django/django/commit/7cf7d74e8a754446eeb85cacf2fef1247e0cb6d7>`__

The following releases have been issued:

* Django 3.2.10 (`download Django 3.2.10 
<https://www.djangoproject.com/m/releases/3.2/Django-3.2.10.tar.gz>`_ | 
`3.2.10 checksums 
<https://www.djangoproject.com/m/pgp/Django-3.2.10.checksum.txt>`_)
* Django 3.1.14 (`download Django 3.1.14 
<https://www.djangoproject.com/m/releases/3.1/Django-3.1.14.tar.gz>`_ | 
`3.1.14 checksums 
<https://www.djangoproject.com/m/pgp/Django-3.1.14.checksum.txt>`_)
* Django 2.2.25 (`download Django 2.2.25 
<https://www.djangoproject.com/m/releases/2.2/Django-2.2.25.tar.gz>`_ | 
`2.2.25 checksums 
<https://www.djangoproject.com/m/pgp/Django-2.2.25.checksum.txt>`_)

The PGP key ID used for this release is Mariusz Felisiak: 
`2EF56372BA48CD1B <https://github.com/felixxm.gpg>`_.

General notes regarding security reporting
==========================================

As always, we ask that potential security issues be reported via
private email to ``security@...ngoproject.com``, and not via Django's
Trac instance or the django-developers list. Please see `our security
policies <https://www.djangoproject.com/security/>`_ for further
information.

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

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