Date: Wed, 1 Nov 2023 08:04:37 +0100 From: Mariusz Felisiak <felisiak.mariusz@...il.com> To: oss-security@...ts.openwall.com Subject: Django: CVE-2023-46695: Potential denial of service vulnerability in UsernameField on Windows https://www.djangoproject.com/weblog/2023/nov/01/security-releases/ In accordance with `our security release policy <https://docs.djangoproject.com/en/dev/internals/security/>`_, the Django team is issuing `Django 4.2.7 <https://docs.djangoproject.com/en/dev/releases/4.2.7/>`_, `Django 4.1.13 <https://docs.djangoproject.com/en/dev/releases/4.1.13/>`_, and `Django 3.2.23 <https://docs.djangoproject.com/en/dev/releases/3.2.23/>`_. These releases addresses the security issue detailed below. We encourage all users of Django to upgrade as soon as possible. CVE-2023-46695: Potential denial of service vulnerability in ``UsernameField`` on Windows ========================================================================================= The NFKC normalization 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. Thanks `MProgrammer <https://hackerone.com/mprogrammer>`_ for the report. This issue has severity "moderate" according to the Django security policy. Affected supported versions =========================== * Django main branch * Django 5.0 (currently at beta status) * Django 4.2 * Django 4.1 * Django 3.2 Resolution ========== Patches to resolve the issue have been applied to Django's main branch and the 5.0, 4.2, 4.1, and 3.2 release branches. The patches may be obtained from the following changesets: * On the `main branch <https://github.com/django/django/commit/05ba4130ee878c4f520b5d34bb11eaad794623be>`__ * On the `5.0 release branch <https://github.com/django/django/commit/bb71d34551207b2472c493655d0d7f3b2975d686>`__ * On the `4.2 release branch <https://github.com/django/django/commit/048a9ebb6ea468426cb4e57c71572cbbd975517f>`__ * On the `4.1 release branch <https://github.com/django/django/commit/4965bfdde2e5a5c883685019e57d123a3368a75e>`__ * On the `3.2 release branch <https://github.com/django/django/commit/f9a7fb8466a7ba4857eaf930099b5258f3eafb2b>`__ The following releases have been issued: * Django 4.2.7 (`download Django 4.2.7 <https://www.djangoproject.com/m/releases/4.2/Django-4.2.7.tar.gz>`_ | `4.2.7 checksums <https://www.djangoproject.com/m/pgp/Django-4.2.7.checksum.txt>`_) * Django 4.1.13 (`download Django 4.1.13 <https://www.djangoproject.com/m/releases/4.1/Django-4.1.13.tar.gz>`_ | `4.1.13 checksums <https://www.djangoproject.com/m/pgp/Django-4.1.13.checksum.txt>`_) * Django 3.2.23 (`download Django 3.2.23 <https://www.djangoproject.com/m/releases/3.2/Django-3.2.23.tar.gz>`_ | `3.2.23 checksums <https://www.djangoproject.com/m/pgp/Django-3.2.23.checksum.txt>`_) The PGP key ID used for this release is Mariusz Felisiak: `2EF56372BA48CD1B <https://github.com/felixxm.gpg>`_. General notes regarding security reporting ========================================== As always, we ask that potential security issues be reported via private email to ``security@...ngoproject.com``, and not via Django's Trac instance or the django-developers list. Please see `our security policies <https://www.djangoproject.com/security/>`_ for further information.
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