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Fixed CVE-2019-12781 -- Made HttpRequest always trust SECURE_PROXY_SSL_HEADER if set.

An HTTP request would not be redirected to HTTPS when the
SECURE_PROXY_SSL_HEADER and SECURE_SSL_REDIRECT settings were used if
the proxy connected to Django via HTTPS.

HttpRequest.scheme will now always trust the SECURE_PROXY_SSL_HEADER if
set, rather than falling back to the request scheme when the
SECURE_PROXY_SSL_HEADER did not have the secure value.

Thanks to Gavin Wahl for the report and initial patch suggestion, and
Shai Berger for review.
This commit is contained in:
Carlton Gibson 2019-06-13 10:57:29 +02:00 committed by Mariusz Felisiak
parent 30b3ee9d0b
commit 54d0f5e62f
6 changed files with 85 additions and 9 deletions

View File

@ -226,13 +226,14 @@ class HttpRequest:
def scheme(self):
if settings.SECURE_PROXY_SSL_HEADER:
try:
header, value = settings.SECURE_PROXY_SSL_HEADER
header, secure_value = settings.SECURE_PROXY_SSL_HEADER
except ValueError:
raise ImproperlyConfigured(
'The SECURE_PROXY_SSL_HEADER setting must be a tuple containing two values.'
)
if self.META.get(header) == value:
return 'https'
header_value = self.META.get(header)
if header_value is not None:
return 'https' if header_value == secure_value else 'http'
return self._get_scheme()
def is_secure(self):

View File

@ -2253,10 +2253,13 @@ By default, ``is_secure()`` determines if a request is secure by confirming
that a requested URL uses ``https://``. This method is important for Django's
CSRF protection, and it may be used by your own code or third-party apps.
If your Django app is behind a proxy, though, the proxy may be "swallowing" the
fact that a request is HTTPS, using a non-HTTPS connection between the proxy
and Django. In this case, ``is_secure()`` would always return ``False`` -- even
for requests that were made via HTTPS by the end user.
If your Django app is behind a proxy, though, the proxy may be "swallowing"
whether the original request uses HTTPS or not. If there is a non-HTTPS
connection between the proxy and Django then ``is_secure()`` would always
return ``False`` -- even for requests that were made via HTTPS by the end user.
In contrast, if there is an HTTPS connection between the proxy and Django then
``is_secure()`` would always return ``True`` -- even for requests that were
made originally via HTTP.
In this situation, configure your proxy to set a custom HTTP header that tells
Django whether the request came in via HTTPS, and set

View File

@ -5,3 +5,23 @@ Django 1.11.22 release notes
*July 1, 2019*
Django 1.11.22 fixes a security issue in 1.11.21.
CVE-2019-12781: Incorrect HTTP detection with reverse-proxy connecting via HTTPS
--------------------------------------------------------------------------------
When deployed behind a reverse-proxy connecting to Django via HTTPS,
:attr:`django.http.HttpRequest.scheme` would incorrectly detect client
requests made via HTTP as using HTTPS. This entails incorrect results for
:meth:`~django.http.HttpRequest.is_secure`, and
:meth:`~django.http.HttpRequest.build_absolute_uri`, and that HTTP
requests would not be redirected to HTTPS in accordance with
:setting:`SECURE_SSL_REDIRECT`.
``HttpRequest.scheme`` now respects :setting:`SECURE_PROXY_SSL_HEADER`, if it
is configured, and the appropriate header is set on the request, for both HTTP
and HTTPS requests.
If you deploy Django behind a reverse-proxy that forwards HTTP requests, and
that connects to Django via HTTPS, be sure to verify that your application
correctly handles code paths relying on ``scheme``, ``is_secure()``,
``build_absolute_uri()``, and ``SECURE_SSL_REDIRECT``.

View File

@ -5,3 +5,23 @@ Django 2.1.10 release notes
*July 1, 2019*
Django 2.1.10 fixes a security issue in 2.1.9.
CVE-2019-12781: Incorrect HTTP detection with reverse-proxy connecting via HTTPS
--------------------------------------------------------------------------------
When deployed behind a reverse-proxy connecting to Django via HTTPS,
:attr:`django.http.HttpRequest.scheme` would incorrectly detect client
requests made via HTTP as using HTTPS. This entails incorrect results for
:meth:`~django.http.HttpRequest.is_secure`, and
:meth:`~django.http.HttpRequest.build_absolute_uri`, and that HTTP
requests would not be redirected to HTTPS in accordance with
:setting:`SECURE_SSL_REDIRECT`.
``HttpRequest.scheme`` now respects :setting:`SECURE_PROXY_SSL_HEADER`, if it
is configured, and the appropriate header is set on the request, for both HTTP
and HTTPS requests.
If you deploy Django behind a reverse-proxy that forwards HTTP requests, and
that connects to Django via HTTPS, be sure to verify that your application
correctly handles code paths relying on ``scheme``, ``is_secure()``,
``build_absolute_uri()``, and ``SECURE_SSL_REDIRECT``.

View File

@ -4,8 +4,28 @@ Django 2.2.3 release notes
*Expected July 1, 2019*
Django 2.2.3 fixes several bugs in 2.2.2. Also, the latest string translations
from Transifex are incorporated.
Django 2.2.3 fixes a security issue and several bugs in 2.2.2. Also, the latest
string translations from Transifex are incorporated.
CVE-2019-12781: Incorrect HTTP detection with reverse-proxy connecting via HTTPS
--------------------------------------------------------------------------------
When deployed behind a reverse-proxy connecting to Django via HTTPS,
:attr:`django.http.HttpRequest.scheme` would incorrectly detect client
requests made via HTTP as using HTTPS. This entails incorrect results for
:meth:`~django.http.HttpRequest.is_secure`, and
:meth:`~django.http.HttpRequest.build_absolute_uri`, and that HTTP
requests would not be redirected to HTTPS in accordance with
:setting:`SECURE_SSL_REDIRECT`.
``HttpRequest.scheme`` now respects :setting:`SECURE_PROXY_SSL_HEADER`, if it is
configured, and the appropriate header is set on the request, for both HTTP and
HTTPS requests.
If you deploy Django behind a reverse-proxy that forwards HTTP requests, and
that connects to Django via HTTPS, be sure to verify that your application
correctly handles code paths relying on ``scheme``, ``is_secure()``,
``build_absolute_uri()``, and ``SECURE_SSL_REDIRECT``.
Bugfixes
========

View File

@ -378,6 +378,18 @@ class SecureProxySslHeaderTest(SimpleTestCase):
req.META['HTTP_X_FORWARDED_PROTOCOL'] = 'https'
self.assertIs(req.is_secure(), True)
@override_settings(SECURE_PROXY_SSL_HEADER=('HTTP_X_FORWARDED_PROTOCOL', 'https'))
def test_xheader_preferred_to_underlying_request(self):
class ProxyRequest(HttpRequest):
def _get_scheme(self):
"""Proxy always connecting via HTTPS"""
return 'https'
# Client connects via HTTP.
req = ProxyRequest()
req.META['HTTP_X_FORWARDED_PROTOCOL'] = 'http'
self.assertIs(req.is_secure(), False)
class IsOverriddenTest(SimpleTestCase):
def test_configure(self):