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Code Issues 32 Releases Wiki Activity

Fixed CVE-2021-33571 -- Prevented leading zeros in IPv4 addresses.

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validate_ipv4_address() was affected only on Python < 3.9.5, see [1].
URLValidator() uses a regular expressions and it was affected on all
Python versions.

[1] https://bugs.python.org/issue36384
This commit is contained in:
Mariusz Felisiak
2021-05-24 09:55:14 +02:00
committed by Carlton Gibson
parent 46572de2e9
commit e1d787f1b3
7 changed files with 87 additions and 1 deletions
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13
docs/releases/2.2.24.txt
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@@ -17,3 +17,16 @@ the existence but also the file contents would have been exposed.
As a mitigation, path sanitation is now applied and only files within the
template root directories can be loaded.
CVE-2021-33571: Possible indeterminate SSRF, RFI, and LFI attacks since validators accepted leading zeros in IPv4 addresses
===========================================================================================================================
:class:`~django.core.validators.URLValidator`,
:func:`~django.core.validators.validate_ipv4_address`, and
:func:`~django.core.validators.validate_ipv46_address` didn't prohibit leading
zeros in octal literals. If you used such values you could suffer from
indeterminate SSRF, RFI, and LFI attacks.
:func:`~django.core.validators.validate_ipv4_address` and
:func:`~django.core.validators.validate_ipv46_address` validators were not
affected on Python 3.9.5+.