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Code Issues 32 Releases Wiki Activity

Fixed CVE-2018-7536 -- Fixed catastrophic backtracking in urlize and urlizetrunc template filters.

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Thanks Florian Apolloner for assisting with the patch.
This commit is contained in:
Tim Graham
2018-02-24 11:30:11 -05:00
parent 4d2a2c83c7
commit 8618271caa
5 changed files with 63 additions and 12 deletions
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11
docs/releases/1.8.19.txt
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@@ -5,3 +5,14 @@ Django 1.8.19 release notes
*March 6, 2018*
Django 1.8.19 fixes two security issues in 1.18.18.
CVE-2018-7536: Denial-of-service possibility in ``urlize`` and ``urlizetrunc`` template filters
===============================================================================================
The ``django.utils.html.urlize()`` function was extremely slow to evaluate
certain inputs due to a catastrophic backtracking vulnerability in a regular
expression. The ``urlize()`` function is used to implement the ``urlize`` and
``urlizetrunc`` template filters, which were thus vulnerable.
The problematic regular expression is replaced with parsing logic that behaves
similarly.