Description
There is a LOW severity vulnerability affecting CPython, specifically the 'http.cookies' standard library module. When parsing cookies that contained backslashes for quoted characters in the cookie value, the parser would use an algorithm with quadratic complexity, resulting in excess CPU resources being used while parsing the value.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- Python Software Foundation / CPython0 – 3.8.20
- Python Software Foundation / CPython3.9.0 – 3.9.20
- Python Software Foundation / CPython3.10.0 – 3.10.15
- Python Software Foundation / CPython3.11.0 – 3.11.10
- Python Software Foundation / CPython3.12.0 – 3.12.6
- Python Software Foundation / CPython3.13.0a1 – 3.13.0rc2
References
- PATCHhttps://github.com/python/cpython/pull/123075
- MISChttps://github.com/python/cpython/issues/123067
- MISChttps://mail.python.org/archives/list/security-announce@python.org/thread/HXJAAAALNUNGCQUS2W7WR6GFIZIHFOOK/
- PATCHhttps://github.com/python/cpython/commit/391e5626e3ee5af267b97e37abc7475732e67621
- PATCHhttps://github.com/python/cpython/commit/dcc3eaef98cd94d6cb6cb0f44bd1c903d04f33b1
- PATCHhttps://github.com/python/cpython/commit/a77ab24427a18bff817025adb03ca920dc3f1a06
- PATCHhttps://github.com/python/cpython/commit/b2f11ca7667e4d57c71c1c88b255115f16042d9a
- PATCHhttps://github.com/python/cpython/commit/d4ac921a4b081f7f996a5d2b101684b67ba0ed7f
- PATCHhttps://github.com/python/cpython/commit/d662e2db2605515a767f88ad48096b8ac623c774
- PATCHhttps://github.com/python/cpython/commit/44e458357fca05ca0ae2658d62c8c595b048b5ef