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Date: Wed, 18 Dec 2019 10:28:40 +0100
From: Mariusz Felisiak <felisiak.mariusz@...il.com>
To: oss-security@...ts.openwall.com
Subject: Django: CVE-2019-19844: Potential account hijack via password reset
form
https://www.djangoproject.com/weblog/2019/dec/18/security-releases/
In accordance with `our security release policy
<https://docs.djangoproject.com/en/dev/internals/security/>`_, the
Django team is issuing `Django 3.0.1
<https://docs.djangoproject.com/en/dev/releases/3.0.1/>`_, `Django 2.2.9
<https://docs.djangoproject.com/en/dev/releases/2.2.9/>`_ and `Django
1.11.27 <https://docs.djangoproject.com/en/dev/releases/1.11.27/>`_.
These release addresses the security issue detailed below. We encourage
all users of Django to upgrade as soon as possible.
CVE-2019-19844: Potential account hijack via password reset form
================================================================
By submitting a suitably crafted email address making use of Unicode
characters, that compared equal to an existing user email when
lower-cased for
comparison, an attacker could be sent a password reset token for the matched
account.
In order to avoid this vulnerability, password reset requests now
compare the
submitted email using the stricter, recommended algorithm for
case-insensitive
comparison of two identifiers from `Unicode Technical Report 36, section
2.11.2(B)(2)`__. Upon a match, the email containing the reset token will be
sent to the email address on record rather than the submitted address.
.. __: https://www.unicode.org/reports/tr36/#Recommendations_General
Affected supported versions
===========================
* Django master branch
* Django 3.0
* Django 2.2
* Django 2.1
Resolution
==========
Patches to resolve the issue have been applied to Django's master branch and
the 3.0, 2.2, and 1.11 release branches. The patches may be obtained
from the following changesets:
* On the `master branch
<https://github.com/django/django/commit/5b1fbcef7a8bec991ebe7b2a18b5d5a95d72cb70>`__
* On the `3.0 release branch
<https://github.com/django/django/commit/302a4ff1e8b1c798aab97673909c7a3dfda42c26>`__
* On the `2.2 release branch
<https://github.com/django/django/commit/4d334bea06cac63dc1272abcec545b85136cca0e>`__
* On the `1.11 release branch
<https://github.com/django/django/commit/f4cff43bf921fcea6a29b726eb66767f67753fa2>`__
The following releases have been issued:
* Django 3.0.1 (`download Django 3.0.1
<https://www.djangoproject.com/m/releases/3.0/Django-3.0.1.tar.gz>`_ |
`3.0.1 checksums
<https://www.djangoproject.com/m/pgp/Django-3.0.1.checksum.txt>`_)
* Django 2.2.9 (`download Django 2.2.9
<https://www.djangoproject.com/m/releases/2.2/Django-2.2.9.tar.gz>`_ |
`2.2.9 checksums
<https://www.djangoproject.com/m/pgp/Django-2.2.9.checksum.txt>`_)
* Django 1.11.27 (`download Django 1.11.27
<https://www.djangoproject.com/m/releases/1.11/Django-1.11.27.tar.gz>`_
| `1.11.27 checksums
<https://www.djangoproject.com/m/pgp/Django-1.11.27.checksum.txt>`_)
The PGP key ID used for these releases is Mariusz Felisiak:
2EF56372BA48CD1B.
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.
This issue was known publicly, therefore we fixed the issue as soon as
possible without the usual `prenotification process
<https://docs.djangoproject.com/en/dev/internals/security/#how-django-discloses-security-issues>`_.
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