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- ===========================
- Django 1.4.18 release notes
- ===========================
- *Under development*
- Django 1.4.18 fixes several security issues in 1.4.17 as well as a regression
- on Python 2.5 in the 1.4.17 release.
- WSGI header spoofing via underscore/dash conflation
- ===================================================
- When HTTP headers are placed into the WSGI environ, they are normalized by
- converting to uppercase, converting all dashes to underscores, and prepending
- `HTTP_`. For instance, a header ``X-Auth-User`` would become
- ``HTTP_X_AUTH_USER`` in the WSGI environ (and thus also in Django's
- ``request.META`` dictionary).
- Unfortunately, this means that the WSGI environ cannot distinguish between
- headers containing dashes and headers containing underscores: ``X-Auth-User``
- and ``X-Auth_User`` both become ``HTTP_X_AUTH_USER``. This means that if a
- header is used in a security-sensitive way (for instance, passing
- authentication information along from a front-end proxy), even if the proxy
- carefully strips any incoming value for ``X-Auth-User``, an attacker may be
- able to provide an ``X-Auth_User`` header (with underscore) and bypass this
- protection.
- In order to prevent such attacks, both Nginx and Apache 2.4+ strip all headers
- containing underscores from incoming requests by default. Django's built-in
- development server now does the same. Django's development server is not
- recommended for production use, but matching the behavior of common production
- servers reduces the surface area for behavior changes during deployment.
- Bugfixes
- ========
- * To maintain compatibility with Python 2.5, Django's vendored version of six,
- :mod:`django.utils.six`, has been downgraded to 1.8.0 which is the last
- version to support Python 2.5.
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