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Code Issues 32 Releases Wiki Activity

Fixed CVE-2023-23969 -- Prevented DoS with pathological values for Accept-Language.

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The parsed values of Accept-Language headers are cached in order to
avoid repetitive parsing. This leads to a potential denial-of-service
vector via excessive memory usage if the raw value of Accept-Language
headers is very large.

Accept-Language headers are now limited to a maximum length in order
to avoid this issue.
This commit is contained in:
Nick Pope
2023-01-25 12:21:48 +01:00
committed by Mariusz Felisiak
parent 110b3b8356
commit 8c660fb592
5 changed files with 72 additions and 5 deletions
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12
tests/i18n/tests.py
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@@ -1501,6 +1501,14 @@ class MiscTests(SimpleTestCase):
("de;q=0.", [("de", 0.0)]),
("en; q=1,", [("en", 1.0)]),
("en; q=1.0, * ; q=0.5", [("en", 1.0), ("*", 0.5)]),
(
"en" + "-x" * 20,
[("en-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x", 1.0)],
),
(
", ".join(["en; q=1.0"] * 20),
[("en", 1.0)] * 20,
),
# Bad headers
("en-gb;q=1.0000", []),
("en;q=0.1234", []),
@@ -1517,6 +1525,10 @@ class MiscTests(SimpleTestCase):
("", []),
("en;q=1e0", []),
("en-au;q=１.０", []),
# Invalid as language-range value too long.
("xxxxxxxx" + "-xxxxxxxx" * 500, []),
# Header value too long, only parse up to limit.
(", ".join(["en; q=1.0"] * 500), [("en", 1.0)] * 45),
]
for value, expected in tests:
with self.subTest(value=value):