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                             CERT-Renater

                 Note d'Information No. 2021/VULN259
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DATE                : 05/05/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Django versions prior to 3.2.1,
                                     3.1.9, 2.2.21.

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https://www.djangoproject.com/weblog/2021/may/04/security-releases/
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Django security releases issued: 3.2.1, 3.1.9, and 2.2.21
Posted by Carlton Gibson on mai 4, 2021

In accordance with our security release policy, the Django team is
issuing Django 3.2.1, Django 3.1.9, and Django 2.2.21. These release
addresses the security issue detailed below. We encourage all users of
Django to upgrade as soon as possible.


CVE-2021-31542: Potential directory-traversal via uploaded files

MultiPartParser, UploadedFile, and FieldFile allowed directory-traversal
via uploaded files with suitably crafted file names.

In order to mitigate this risk, stricter basename and path sanitation is
now applied. Specifically, empty file names and paths with dot segments
will be rejected.

This issue has low severity, according to the Django security policy.

Thank you to Jasu Viding for the report.


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 3.2.1 (download Django 3.2.1 | 3.2.1 checksums)
    Django 3.1.9 (download Django 3.1.9 | 3.1.9 checksums)
    Django 2.2.21 (download Django 2.2.21 | 2.2.21 checksums)

The PGP key ID used for these releases is Carlton Gibson:
E17DF5C82B4F9D00.


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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