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Code Issues 32 Releases Wiki Activity

Fixed CVE-2023-46695 -- Fixed potential DoS in UsernameField on Windows.

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Thanks MProgrammer (https://hackerone.com/mprogrammer) for the report.
This commit is contained in:
Mariusz Felisiak
2023-10-17 11:48:32 +02:00
parent 40b3975e7d
commit 05ba4130ee
5 changed files with 50 additions and 3 deletions
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12
docs/releases/4.2.7.txt
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@@ -7,6 +7,18 @@ Django 4.2.7 release notes
Django 4.2.7 fixes a security issue with severity "moderate" and several bugs
in 4.2.6.
CVE-2023-46695: Potential denial of service vulnerability in ``UsernameField`` on Windows
=========================================================================================
The :func:`NFKC normalization <python:unicodedata.normalize>` is slow on
Windows. As a consequence, ``django.contrib.auth.forms.UsernameField`` was
subject to a potential denial of service attack via certain inputs with a very
large number of Unicode characters.
In order to avoid the vulnerability, invalid values longer than
``UsernameField.max_length`` are no longer normalized, since they cannot pass
validation anyway.
Bugfixes
========