Arch Linux Security Advisory ASA-201907-3
========================================
Severity: High
Date    : 2019-07-06
CVE-ID  : CVE-2019-12781
Package : python2-django
Type    : silent downgrade
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1001

Summary
======
The package python2-django before version 1.11.22-1 is vulnerable to
silent downgrade.

Resolution
=========
Upgrade to 1.11.22-1.

# pacman -Syu "python2-django>=1.11.22-1"

The problem has been fixed upstream in version 1.11.22.

Workaround
=========
None.

Description
==========
An HTTP request is not redirected to HTTPS when the
SECURE_PROXY_SSL_HEADER and SECURE_SSL_REDIRECT settings are used, and
the proxy connects to Django via HTTPS. In other words,
django.http.HttpRequest.scheme has incorrect behavior when a client
uses HTTP.

Impact
=====
A remote attacker is able to perform a man-in-the-middle attack if a
HTTP request is not redirected to HTTPS.

References
=========
https://docs.djangoproject.com/en/2.2/releases/2.2.3/
https://www.openwall.com/lists/oss-security/2019/07/01/3
https://github.com/django/django/commit/77706a3e4766da5d5fb75c4db22a0a59a28e6cd6
https://security.archlinux.org/CVE-2019-12781