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e1e81aa1c4
In Python 3.9.5+ urllib.parse() automatically removes ASCII newlines
and tabs from URLs [1, 2]. Unfortunately it created an issue in
the URLValidator. URLValidator uses urllib.urlsplit() and
urllib.urlunsplit() for creating a URL variant with Punycode which no
longer contains newlines and tabs in Python 3.9.5+. As a consequence,
the regular expression matched the URL (without unsafe characters) and
the source value (with unsafe characters) was considered valid.
[1] https://bugs.python.org/issue43882 and
[2] 76cd81d603
23 lines
978 B
Plaintext
23 lines
978 B
Plaintext
===========================
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Django 2.2.22 release notes
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===========================
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*May 6, 2021*
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Django 2.2.22 fixes a security issue in 2.2.21.
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CVE-2021-32052: Header injection possibility since ``URLValidator`` accepted newlines in input on Python 3.9.5+
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===============================================================================================================
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On Python 3.9.5+, :class:`~django.core.validators.URLValidator` didn't prohibit
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newlines and tabs. If you used values with newlines in HTTP response, you could
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suffer from header injection attacks. Django itself wasn't vulnerable because
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:class:`~django.http.HttpResponse` prohibits newlines in HTTP headers.
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Moreover, the ``URLField`` form field which uses ``URLValidator`` silently
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removes newlines and tabs on Python 3.9.5+, so the possibility of newlines
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entering your data only existed if you are using this validator outside of the
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form fields.
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This issue was introduced by the :bpo:`43882` fix.
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