django/docs/releases/1.4.13.txt

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===========================
Django 1.4.13 release notes
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===========================
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*May 14, 2014*
Django 1.4.13 fixes two security issues in 1.4.12.
Caches may incorrectly be allowed to store and serve private data
=================================================================
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In certain situations, Django may allow caches to store private data
related to a particular session and then serve that data to requests
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with a different session, or no session at all. This can lead to
information disclosure and can be a vector for cache poisoning.
When using Django sessions, Django will set a ``Vary: Cookie`` header to
ensure caches do not serve cached data to requests from other sessions.
However, older versions of Internet Explorer (most likely only Internet
Explorer 6, and Internet Explorer 7 if run on Windows XP or Windows Server
2003) are unable to handle the ``Vary`` header in combination with many content
types. Therefore, Django would remove the header if the request was made by
Internet Explorer.
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To remedy this, the special behavior for these older Internet Explorer versions
has been removed, and the ``Vary`` header is no longer stripped from the response.
In addition, modifications to the ``Cache-Control`` header for all Internet Explorer
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requests with a ``Content-Disposition`` header have also been removed as they
were found to have similar issues.
Malformed redirect URLs from user input not correctly validated
===============================================================
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The validation for redirects did not correctly validate some malformed URLs,
which are accepted by some browsers. This allows a user to be redirected to
an unsafe URL unexpectedly.
Django relies on user input in some cases (e.g.
:func:`django.contrib.auth.views.login`, ``django.contrib.comments``, and
:doc:`i18n </topics/i18n/index>`) to redirect the user to an "on success" URL.
The security checks for these redirects (namely
``django.util.http.is_safe_url()``) did not correctly validate some malformed
URLs, such as `http:\\\\\\djangoproject.com`, which are accepted by some browsers
with more liberal URL parsing.
To remedy this, the validation in ``is_safe_url()`` has been tightened to be able
to handle and correctly validate these malformed URLs.