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==========================
Django 4.0.1 release notes
==========================
*January 4, 2022*
Django 4.0.1 fixes one security issue with severity "medium", two security
issues with severity "low", and several bugs in 4.0.
CVE-2021-45115: Denial-of-service possibility in ``UserAttributeSimilarityValidator``
=====================================================================================
:class:`.UserAttributeSimilarityValidator` incurred significant overhead
evaluating submitted password that were artificially large in relative to the
comparison values. On the assumption that access to user registration was
unrestricted this provided a potential vector for a denial-of-service attack.
In order to mitigate this issue, relatively long values are now ignored by
``UserAttributeSimilarityValidator``.
This issue has severity "medium" according to the :ref:`Django security policy
<security-disclosure>`.
CVE-2021-45116: Potential information disclosure in ``dictsort`` template filter
================================================================================
Due to leveraging the Django Template Language's variable resolution logic, the
:tfilter:`dictsort` template filter was potentially vulnerable to information
disclosure or unintended method calls, if passed a suitably crafted key.
In order to avoid this possibility, ``dictsort`` now works with a restricted
resolution logic, that will not call methods, nor allow indexing on
dictionaries.
As a reminder, all untrusted user input should be validated before use.
This issue has severity "low" according to the :ref:`Django security policy
<security-disclosure>`.
CVE-2021-45452: Potential directory-traversal via ``Storage.save()``
====================================================================
``Storage.save()`` allowed directory-traversal if directly passed suitably
crafted file names.
This issue has severity "low" according to the :ref:`Django security policy
<security-disclosure>`.
Bugfixes
========
* Fixed a regression in Django 4.0 that caused a crash of
``assertFormsetError()`` on a formset named ``form`` (:ticket:`33346`).
* Fixed a bug in Django 4.0 that caused a crash on booleans with the
``RedisCache`` backend (:ticket:`33361`).
* Relaxed the check added in Django 4.0 to reallow use of a duck-typed
``HttpRequest`` in ``django.views.decorators.cache.cache_control()`` and
``never_cache()`` decorators (:ticket:`33350`).
* Fixed a regression in Django 4.0 that caused creating bogus migrations for
models that reference swappable models such as ``auth.User``
(:ticket:`33366`).
* Fixed a long standing bug in :ref:`geos-geometry-collections` and
:class:`~django.contrib.gis.geos.Polygon` that caused a crash on some
platforms (reported on macOS based on the ``ARM64`` architecture)
(:ticket:`32600`).
|
