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108 lines
4.8 KiB
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108 lines
4.8 KiB
Plaintext
==========================
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Django 1.9.3 release notes
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==========================
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*March 1, 2016*
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Django 1.9.3 fixes two security issues and several bugs in 1.9.2.
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CVE-2016-2512: Malicious redirect and possible XSS attack via user-supplied redirect URLs containing basic auth
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===============================================================================================================
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Django relies on user input in some cases (e.g.
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``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 check for these
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redirects (namely ``django.utils.http.is_safe_url()``) considered some URLs
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with basic authentication credentials "safe" when they shouldn't be.
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For example, a URL like ``http://mysite.example.com\@attacker.com`` would be
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considered safe if the request's host is ``http://mysite.example.com``, but
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redirecting to this URL sends the user to ``attacker.com``.
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Also, if a developer relies on ``is_safe_url()`` to provide safe redirect
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targets and puts such a URL into a link, they could suffer from an XSS attack.
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CVE-2016-2513: User enumeration through timing difference on password hasher work factor upgrade
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================================================================================================
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In each major version of Django since 1.6, the default number of iterations for
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the ``PBKDF2PasswordHasher`` and its subclasses has increased. This improves
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the security of the password as the speed of hardware increases, however, it
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also creates a timing difference between a login request for a user with a
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password encoded in an older number of iterations and login request for a
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nonexistent user (which runs the default hasher's default number of iterations
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since Django 1.6).
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This only affects users who haven't logged in since the iterations were
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increased. The first time a user logs in after an iterations increase, their
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password is updated with the new iterations and there is no longer a timing
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difference.
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The new ``BasePasswordHasher.harden_runtime()`` method allows hashers to bridge
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the runtime gap between the work factor (e.g. iterations) supplied in existing
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encoded passwords and the default work factor of the hasher. This method
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is implemented for ``PBKDF2PasswordHasher`` and ``BCryptPasswordHasher``.
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The number of rounds for the latter hasher hasn't changed since Django 1.4, but
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some projects may subclass it and increase the work factor as needed.
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A warning will be emitted for any :ref:`third-party password hashers that don't
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implement <write-your-own-password-hasher>` a ``harden_runtime()`` method.
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If you have different password hashes in your database (such as SHA1 hashes
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from users who haven't logged in since the default hasher switched to PBKDF2
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in Django 1.4), the timing difference on a login request for these users may be
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even greater and this fix doesn't remedy that difference (or any difference
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when changing hashers). You may be able to :ref:`upgrade those hashes
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<wrapping-password-hashers>` to prevent a timing attack for that case.
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Bugfixes
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========
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* Skipped URL checks (new in 1.9) if the ``ROOT_URLCONF`` setting isn't defined
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(:ticket:`26155`).
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* Fixed a crash on PostgreSQL that prevented using ``TIME_ZONE=None`` and
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``USE_TZ=False`` (:ticket:`26177`).
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* Added system checks for query name clashes of hidden relationships
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(:ticket:`26162`).
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* Fixed a regression for cases where
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``ForeignObject.get_extra_descriptor_filter()`` returned a ``Q`` object
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(:ticket:`26153`).
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* Fixed regression with an ``__in=qs`` lookup for a ``ForeignKey`` with
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``to_field`` set (:ticket:`26196`).
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* Made ``forms.FileField`` and ``utils.translation.lazy_number()`` picklable
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(:ticket:`26212`).
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* Fixed :class:`~django.contrib.postgres.fields.RangeField` and
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:class:`~django.contrib.postgres.fields.ArrayField` serialization with
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``None`` values (:ticket:`26215`).
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* Fixed a crash when filtering by a ``Decimal`` in ``RawQuery``
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(:ticket:`26219`).
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* Reallowed dashes in top-level domain names of URLs checked by
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``URLValidator`` to fix a regression in Django 1.8 (:ticket:`26204`).
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* Fixed some crashing deprecation shims in ``SimpleTemplateResponse`` that
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regressed in Django 1.9 (:ticket:`26253`).
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* Fixed ``BoundField`` to reallow slices of subwidgets (:ticket:`26267`).
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* Changed the admin's "permission denied" message in the login template to use
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``get_username`` instead of ``username`` to support custom user models
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(:ticket:`26231`).
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* Fixed a crash when passing a nonexistent template name to the cached template
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loader's ``load_template()`` method (:ticket:`26280`).
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* Prevented ``ContentTypeManager`` instances from sharing their cache
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(:ticket:`26286`).
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* Reverted a change in Django 1.9.2 (:ticket:`25858`) that prevented relative
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lazy relationships defined on abstract models to be resolved according to
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their concrete model's ``app_label`` (:ticket:`26186`).
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