[2.2.x] Fixed #30530, CVE-2021-44420 -- Fixed potential bypass of an upstream access control based on URL paths.

Thanks Sjoerd Job Postmus and TengMA(@te3t123) for reports.

Backport of d4dcd5b9dd9e462fec8220e33e3e6c822b7e88a6 from main.

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/urlpatterns/tests.py b/tests/urlpatterns/tests.py
index f696cd531d..38b4392adc 100644
--- a/tests/urlpatterns/tests.py
+++ b/tests/urlpatterns/tests.py
@@ -116,6 +116,19 @@ class SimplifiedURLTests(SimpleTestCase):
         with self.assertRaisesMessage(ImproperlyConfigured, msg):
             path('foo/<nonexistent:var>/', empty_view)
 
+    def test_path_trailing_newlines(self):
+        tests = [
+            '/articles/2003/\n',
+            '/articles/2010/\n',
+            '/en/foo/\n',
+            '/included_urls/extra/\n',
+            '/regex/1/\n',
+            '/users/1/\n',
+        ]
+        for url in tests:
+            with self.subTest(url=url), self.assertRaises(Resolver404):
+                resolve(url)
+
 
 @override_settings(ROOT_URLCONF='urlpatterns.converter_urls')
 class ConverterTests(SimpleTestCase):