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69 lines
2.8 KiB
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69 lines
2.8 KiB
Plaintext
==========================
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Django 1.1.4 release notes
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==========================
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Welcome to Django 1.1.4!
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This is the fourth "bugfix" release in the Django 1.1 series,
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improving the stability and performance of the Django 1.1 codebase.
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With one exception, Django 1.1.4 maintains backwards compatibility
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with Django 1.1.3. It also contains a number of fixes and other
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improvements. Django 1.1.4 is a recommended upgrade for any
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development or deployment currently using or targeting Django 1.1.
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For full details on the new features, backwards incompatibilities, and
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deprecated features in the 1.1 branch, see the :doc:`/releases/1.1`.
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Backwards incompatible changes
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==============================
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CSRF exception for AJAX requests
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--------------------------------
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Django includes a CSRF-protection mechanism, which makes use of a
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token inserted into outgoing forms. Middleware then checks for the
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token's presence on form submission, and validates it.
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Prior to Django 1.2.5, our CSRF protection made an exception for AJAX
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requests, on the following basis:
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* Many AJAX toolkits add an X-Requested-With header when using
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XMLHttpRequest.
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* Browsers have strict same-origin policies regarding
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XMLHttpRequest.
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* In the context of a browser, the only way that a custom header
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of this nature can be added is with XMLHttpRequest.
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Therefore, for ease of use, we did not apply CSRF checks to requests
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that appeared to be AJAX on the basis of the X-Requested-With header.
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The Ruby on Rails web framework had a similar exemption.
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Recently, engineers at Google made members of the Ruby on Rails
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development team aware of a combination of browser plugins and
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redirects which can allow an attacker to provide custom HTTP headers
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on a request to any website. This can allow a forged request to appear
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to be an AJAX request, thereby defeating CSRF protection which trusts
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the same-origin nature of AJAX requests.
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Michael Koziarski of the Rails team brought this to our attention, and
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we were able to produce a proof-of-concept demonstrating the same
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vulnerability in Django's CSRF handling.
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To remedy this, Django will now apply full CSRF validation to all
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requests, regardless of apparent AJAX origin. This is technically
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backwards-incompatible, but the security risks have been judged to
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outweigh the compatibility concerns in this case.
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Additionally, Django will now accept the CSRF token in the custom HTTP
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header X-CSRFTOKEN, as well as in the form submission itself, for ease
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of use with popular JavaScript toolkits which allow insertion of
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custom headers into all AJAX requests.
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Please see the :ref:`CSRF docs for example jQuery code <csrf-ajax>`
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that demonstrates this technique, ensuring that you are looking at the
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documentation for your version of Django, as the exact code necessary
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is different for some older versions of Django.
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