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27 lines
1.2 KiB
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27 lines
1.2 KiB
Plaintext
===========================
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Django 1.4.20 release notes
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===========================
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*March 18, 2015*
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Django 1.4.20 fixes one security issue in 1.4.19.
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Mitigated possible XSS attack via user-supplied redirect URLs
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=============================================================
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Django relies on user input in some cases (e.g.
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:func:`django.contrib.auth.views.login` and :doc:`i18n </topics/i18n/index>`)
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to redirect the user to an "on success" URL. The security checks for these
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redirects (namely ``django.utils.http.is_safe_url()``) accepted URLs with
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leading control characters and so considered URLs like ``\x08javascript:...``
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safe. This issue doesn't affect Django currently, since we only put this URL
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into the ``Location`` response header and browsers seem to ignore JavaScript
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there. Browsers we tested also treat URLs prefixed with control characters such
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as ``%08//example.com`` as relative paths so redirection to an unsafe target
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isn't a problem either.
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However, if a developer relies on ``is_safe_url()`` to
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provide safe redirect targets and puts such a URL into a link, they could
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suffer from an XSS attack as some browsers such as Google Chrome ignore control
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characters at the start of a URL in an anchor ``href``.
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