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Code Issues 32 Releases Wiki Activity

Fixed CVE-2023-43665 -- Mitigated potential DoS in django.utils.text.Truncator when truncating HTML text.

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Thanks Wenchao Li of Alibaba Group for the report.
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Natalia
2023-09-19 09:51:48 -03:00
parent 1dae65dc63
commit 17b51094d7
6 changed files with 115 additions and 13 deletions
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docs/releases/4.2.6.txt
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@@ -7,6 +7,24 @@ Django 4.2.6 release notes
Django 4.2.6 fixes a security issue with severity "moderate" and several bugs
in 4.2.5.
CVE-2023-43665: Denial-of-service possibility in ``django.utils.text.Truncator``
================================================================================
Following the fix for :cve:`2019-14232`, the regular expressions used in the
implementation of ``django.utils.text.Truncator``'s ``chars()`` and ``words()``
methods (with ``html=True``) were revised and improved. However, these regular
expressions still exhibited linear backtracking complexity, so when given a
very long, potentially malformed HTML input, the evaluation would still be
slow, leading to a potential denial of service vulnerability.
The ``chars()`` and ``words()`` methods are used to implement the
:tfilter:`truncatechars_html` and :tfilter:`truncatewords_html` template
filters, which were thus also vulnerable.
The input processed by ``Truncator``, when operating in HTML mode, has been
limited to the first five million characters in order to avoid potential
performance and memory issues.
Bugfixes
========