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17d3a6d804
Thanks João Silva for reporting the problem and Tim Graham for finding the problematic RE and for review. This is a security fix; disclosure to follow shortly.
156 lines
6.6 KiB
Plaintext
156 lines
6.6 KiB
Plaintext
==========================
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Django 1.8.3 release notes
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==========================
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*July 8, 2015*
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Django 1.8.3 fixes several security issues and bugs in 1.8.2.
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Also, ``django.utils.deprecation.RemovedInDjango20Warning`` was renamed to
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``RemovedInDjango110Warning`` as the version roadmap was revised to 1.9, 1.10,
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1.11 (LTS), 2.0 (drops Python 2 support). For backwards compatibility,
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``RemovedInDjango20Warning`` remains as an importable alias.
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Denial-of-service possibility by filling session store
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======================================================
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In previous versions of Django, the session backends created a new empty record
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in the session storage anytime ``request.session`` was accessed and there was a
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session key provided in the request cookies that didn't already have a session
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record. This could allow an attacker to easily create many new session records
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simply by sending repeated requests with unknown session keys, potentially
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filling up the session store or causing other users' session records to be
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evicted.
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The built-in session backends now create a session record only if the session
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is actually modified; empty session records are not created. Thus this
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potential DoS is now only possible if the site chooses to expose a
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session-modifying view to anonymous users.
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As each built-in session backend was fixed separately (rather than a fix in the
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core sessions framework), maintainers of third-party session backends should
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check whether the same vulnerability is present in their backend and correct
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it if so.
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Header injection possibility since validators accept newlines in input
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======================================================================
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Some of Django's built-in validators
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(:class:`~django.core.validators.EmailValidator`, most seriously) didn't
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prohibit newline characters (due to the usage of ``$`` instead of ``\Z`` in the
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regular expressions). If you use values with newlines in HTTP response or email
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headers, you can suffer from header injection attacks. Django itself isn't
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vulnerable because :class:`~django.http.HttpResponse` and the mail sending
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utilities in :mod:`django.core.mail` prohibit newlines in HTTP and SMTP
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headers, respectively. While the validators have been fixed in Django, if
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you're creating HTTP responses or email messages in other ways, it's a good
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idea to ensure that those methods prohibit newlines as well. You might also
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want to validate that any existing data in your application doesn't contain
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unexpected newlines.
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:func:`~django.core.validators.validate_ipv4_address`,
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:func:`~django.core.validators.validate_slug`, and
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:class:`~django.core.validators.URLValidator` are also affected, however, as
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of Django 1.6 the ``GenericIPAddresseField``, ``IPAddressField``, ``SlugField``,
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and ``URLField`` form fields which use these validators all strip the input, so
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the possibility of newlines entering your data only exists if you are using
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these validators outside of the form fields.
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The undocumented, internally unused ``validate_integer()`` function is now
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stricter as it validates using a regular expression instead of simply casting
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the value using ``int()`` and checking if an exception was raised.
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Denial-of-service possibility in URL validation
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===============================================
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:class:`~django.core.validators.URLValidator` included a regular expression
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that was extremely slow to evaluate against certain invalid inputs. This regular
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expression has been simplified and optimized.
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Bugfixes
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========
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* Fixed ``BaseRangeField.prepare_value()`` to use each ``base_field``’s
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``prepare_value()`` method (:ticket:`24841`).
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* Fixed crash during :djadmin:`makemigrations` if a migrations module either
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is missing ``__init__.py`` or is a file (:ticket:`24848`).
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* Fixed ``QuerySet.exists()`` returning incorrect results after annotation with
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``Count()`` (:ticket:`24835`).
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* Corrected ``HStoreField.has_changed()`` (:ticket:`24844`).
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* Reverted an optimization to the CSRF template context processor which caused
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a regression (:ticket:`24836`).
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* Fixed a regression which caused template context processors to overwrite
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variables set on a ``RequestContext`` after it's created (:ticket:`24847`).
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* Prevented the loss of ``null``/``not null`` column properties during field
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renaming of MySQL databases (:ticket:`24817`).
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* Fixed a crash when using a reverse one-to-one relation in
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``ModelAdmin.list_display`` (:ticket:`24851`).
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* Fixed quoting of SQL when renaming a field to ``AutoField`` in PostgreSQL
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(:ticket:`24892`).
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* Fixed lack of unique constraint when changing a field from
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``primary_key=True`` to ``unique=True`` (:ticket:`24893`).
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* Fixed queryset pickling when using ``prefetch_related()`` after deleting
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objects (:ticket:`24831`).
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* Allowed using ``choices`` longer than 1 day with ``DurationField``
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(:ticket:`24897`).
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* Fixed a crash when loading squashed migrations from two apps with a
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dependency between them, where the dependent app's replaced migrations are
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partially applied (:ticket:`24895`).
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* Fixed recording of applied status for squashed (replacement) migrations
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(:ticket:`24628`).
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* Fixed queryset annotations when using ``Case`` expressions with ``exclude()``
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(:ticket:`24833`).
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* Corrected join promotion for multiple ``Case`` expressions. Annotating a
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query with multiple ``Case`` expressions could unexpectedly filter out
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results (:ticket:`24924`).
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* Fixed usage of transforms in subqueries (:ticket:`24744`).
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* Fixed ``SimpleTestCase.assertRaisesMessage()`` on Python 2.7.10
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(:ticket:`24903`).
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* Provided better backwards compatibility for the ``verbosity`` argument in
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``optparse`` management commands by casting it to an integer
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(:ticket:`24769`).
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* Fixed ``prefetch_related()`` on databases other than PostgreSQL for models
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using UUID primary keys (:ticket:`24912`).
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* Fixed removing ``unique_together`` constraints on MySQL (:ticket:`24972`).
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* Fixed crash when uploading images with MIME types that Pillow doesn't detect,
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such as bitmap, in ``forms.ImageField`` (:ticket:`24948`).
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* Fixed a regression when deleting a model through the admin that has a
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``GenericRelation`` with a ``related_query_name`` (:ticket:`24940`).
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* Reallowed non-ASCII values for ``ForeignKey.related_name`` on Python 3 by
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fixing the false positive system check (:ticket:`25016`).
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* Fixed inline forms that use a parent object that has a ``UUIDField`` primary
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key and a child object that has an ``AutoField`` primary key
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(:ticket:`24958`).
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* Fixed a regression in the ``unordered_list`` template filter on certain
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inputs (:ticket:`25031`).
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* Fixed a regression in ``URLValidator`` that invalidated Punycode TLDs
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(:ticket:`25059`).
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* Improved `pyinotify` ``runserver`` polling (:ticket:`23882`).
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