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39 lines
1.8 KiB
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39 lines
1.8 KiB
Plaintext
===========================
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Django 2.1.11 release notes
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===========================
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*August 1, 2019*
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Django 2.1.11 fixes security issues in 2.1.10.
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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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