===========================

Django 1.4.22 release notes

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*August 18, 2015*

Django 1.4.22 fixes a security issue in 1.4.21.

It also fixes support with pip 7+ by disabling wheel support. Older versions

of 1.4 would silently build a broken wheel when installed with those versions

of pip.

Denial-of-service possibility in ``logout()`` view by filling session store

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Previously, a session could be created when anonymously accessing the

``django.contrib.auth.views.logout()`` view (provided it wasn't decorated

with :func:`~django.contrib.auth.decorators.login_required` as done in the

admin). This could allow an attacker to easily create many new session records

by sending repeated requests, potentially filling up the session store or

causing other users' session records to be evicted.

The :class:`~django.contrib.sessions.middleware.SessionMiddleware` has been

modified to no longer create empty session records, including when

:setting:`SESSION_SAVE_EVERY_REQUEST` is active.

Additionally, the ``contrib.sessions.backends.base.SessionBase.flush()`` and

``cache_db.SessionStore.flush()`` methods have been modified to avoid creating

a new empty session. Maintainers of third-party session backends should check

if the same vulnerability is present in their backend and correct it if so.