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                             CERT-Renater

                 Note d'Information No. 2021/VULN264
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DATE                : 06/05/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Django versions prior to 3.2.2,
                                 3.1.10, 2.2.22.

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https://www.djangoproject.com/weblog/2021/may/06/security-releases/
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Django security releases issued: 3.2.2, 3.1.10, and 2.2.22
Posted by Mariusz Felisiak on mai 6, 2021

In accordance with our security release policy, the Django team is
issuing Django 3.2.2, Django 3.1.10, and Django 2.2.22. These releases
address the security issue with severity "moderate" detailed below. We
encourage all users of Django to upgrade as soon as possible.


CVE-2021-32052: Header injection possibility since URLValidator accepted
newlines in input on Python 3.9.5+

On Python 3.9.5+, URLValidator didn't prohibit newlines and tabs. If you
used values with newlines in HTTP response, you could suffer from header
injection attacks. Django itself wasn't vulnerable because HttpResponse
prohibits newlines in HTTP headers.

Moreover, the URLField form field which uses URLValidator silently
removes newlines and tabs on Python 3.9.5+, so the possibility of
newlines entering your data only existed if you are using this validator
outside of the form fields.

This issue was introduced by the bpo-43882 fix.


Affected supported versions

    Django main branch
    Django 3.2
    Django 3.1
    Django 2.2


Resolution

Patches to resolve the issue have been applied to Django's main branch
and to the 3.2, 3.1, and 2.2 release branches. The patches may be
obtained from the following changesets:

    On the main branch
    On the 3.2 release branch
    On the 3.1 release branch
    On the 2.2 release branch

The following releases have been issued:

    Django 3.2.2 (download Django 3.2.2 | 3.2.2 checksums)
    Django 3.1.10 (download Django 3.1.10 | 3.1.10 checksums)
    Django 2.2.22 (download Django 2.2.22 | 2.2.22 checksums)

The PGP key ID used for this release is Mariusz Felisiak:
2EF56372BA48CD1B.


General notes regarding security reporting

As always, we ask that potential security issues be reported via private
email to security@djangoproject.com, and not via Django's Trac instance
or the django-developers list. Please see our security policies for
further information.


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+ CERT-RENATER       |    tel : 01-53-94-20-44          +
+ 23/25 Rue Daviel   |    fax : 01-53-94-20-41          +
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