CVE-2021-23336 log

Source
Severity Medium
Remote Yes
Type Url request injection
Description
The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

The package python-django contains a copy of urllib.parse.parse_qsl() which was added to backport some security fixes. A further security fix has been issued in versions 3.1.7, 3.0.13 and 2.2.19 such that parse_qsl() no longer allows using ; as a query parameter separator by default.
Group Package Affected Fixed Severity Status Ticket
AVG-1597 python2 2.7.18-2 Medium Vulnerable FS#68063
AVG-1593 python-django 3.1.6-1 3.1.7-1 Medium Fixed
AVG-1465 python 3.9.1-2 3.9.2-1 Medium Fixed
Date Advisory Group Package Severity Type
20 Feb 2021 ASA-202102-28 AVG-1593 python-django Medium url request injection
References
https://snyk.io/vuln/SNYK-UPSTREAM-PYTHONCPYTHON-1074933
https://snyk.io/blog/cache-poisoning-in-popular-open-source-packages/
https://bugs.python.org/issue42967
https://github.com/python/cpython/pull/24297
https://github.com/python/cpython/commit/c9f07813ab8e664d8c34413c4fc2d4f86c061a92
https://www.djangoproject.com/weblog/2021/feb/19/security-releases/
https://github.com/django/django/commit/8f6d431b08cbb418d9144b976e7b972546607851