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58 lines
2.6 KiB
Plaintext
58 lines
2.6 KiB
Plaintext
==========================
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Django 2.2.4 release notes
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==========================
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*August 1, 2019*
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Django 2.2.4 fixes security issues and several bugs in 2.2.3.
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CVE-2019-14232: Denial-of-service possibility in ``django.utils.text.Truncator``
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================================================================================
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If ``django.utils.text.Truncator``'s ``chars()`` and ``words()`` methods
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were passed the ``html=True`` argument, they were extremely slow to evaluate
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certain inputs due to a catastrophic backtracking vulnerability in a regular
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expression. The ``chars()`` and ``words()`` methods are used to implement the
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:tfilter:`truncatechars_html` and :tfilter:`truncatewords_html` template
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filters, which were thus vulnerable.
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The regular expressions used by ``Truncator`` have been simplified in order to
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avoid potential backtracking issues. As a consequence, trailing punctuation may
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now at times be included in the truncated output.
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CVE-2019-14233: Denial-of-service possibility in ``strip_tags()``
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=================================================================
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Due to the behavior of the underlying ``HTMLParser``,
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:func:`django.utils.html.strip_tags` would be extremely slow to evaluate
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certain inputs containing large sequences of nested incomplete HTML entities.
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The ``strip_tags()`` method is used to implement the corresponding
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:tfilter:`striptags` template filter, which was thus also vulnerable.
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``strip_tags()`` now avoids recursive calls to ``HTMLParser`` when progress
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removing tags, but necessarily incomplete HTML entities, stops being made.
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Remember that absolutely NO guarantee is provided about the results of
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``strip_tags()`` being HTML safe. So NEVER mark safe the result of a
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``strip_tags()`` call without escaping it first, for example with
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:func:`django.utils.html.escape`.
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Bugfixes
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========
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* Fixed a regression in Django 2.2 when ordering a ``QuerySet.union()``,
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``intersection()``, or ``difference()`` by a field type present more than
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once results in the wrong ordering being used (:ticket:`30628`).
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* Fixed a migration crash on PostgreSQL when adding a check constraint
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with a ``contains`` lookup on
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:class:`~django.contrib.postgres.fields.DateRangeField` or
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:class:`~django.contrib.postgres.fields.DateTimeRangeField`, if the right
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hand side of an expression is the same type (:ticket:`30621`).
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* Fixed a regression in Django 2.2 where auto-reloader crashes if a file path
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contains nulls characters (``'\x00'``) (:ticket:`30506`).
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* Fixed a regression in Django 2.2 where auto-reloader crashes if a translation
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directory cannot be resolved (:ticket:`30647`).
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