Advisories » MGASA-2022-0182

Updated python-waitress packages fix security vulnerability

Publication date: 15 May 2022
Type: security
Affected Mageia releases : 8
CVE: CVE-2022-24761


When using Waitress versions 2.1.0 and prior behind a proxy that does not
properly validate the incoming HTTP request matches the RFC7230 standard,
Waitress and the frontend proxy may disagree on where one request starts
and where it ends. This would allow requests to be smuggled via the
front-end proxy to waitress and later behavior. There are two classes of
vulnerability that may lead to request smuggling that are addressed by
this advisory: The use of Python’s `int()` to parse strings into integers,
leading to `+10` to be parsed as `10`, or `0x01` to be parsed as `1`,
where as the standard specifies that the string should contain only digits
or hex digits; and Waitress does not support chunk extensions, however it
was discarding them without validating that they did not contain illegal
characters. This vulnerability has been patched in Waitress 2.1.1