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