CVE-2022-24761 HTTP Request Smuggling in waitress

What is CVE-2022-24761?

CVE-2022-24761 is a high-severity vulnerability in Debian Debian Linux, published on 17 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Waitress is a Web Server Gateway Interface server for Python 2 and 3. 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. A workaround is available. When deploying a proxy in front of waitress, turning on any and all functionality to make sure that the request matches the RFC7230 standard. Certain proxy servers may not have this functionality though and users are encouraged to upgrade to the latest version of waitress instead.

Weakness: CWE-444

Which versions are affected by CVE-2022-24761?

3 open source packages ship an affected version, including waitress. It affects 2 products.

Products include Agendaless Waitress, Debian Debian Linux.

How do I fix CVE-2022-24761?

Upgrade waitress to 2.1.1 or later.

Is CVE-2022-24761 being exploited?

There is no known exploitation of CVE-2022-24761 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2024-49768 Waitress has request processing race condition in HTTP pipelining with invalid first request Critical 9.1
• CVE-2024-49769 Waitress has a denial of service leading to high CPU usage/resource exhaustion High 7.5
• CVE-2019-16792 HTTP Request Smuggling: Content-Length Sent Twice in Waitress High 7.1
• CVE-2019-16789 HTTP Request Smuggling in Waitress: Invalid whitespace characters in headers High 7.1
• CVE-2019-16785 HTTP Request Smuggling: LF vs CRLF handling in Waitress High 7.1

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-43984, AZL-45060, DEBIAN-CVE-2022-24761, DSA-5138-1, GHSA-4f7p-27jc-3c36, MGASA-2022-0182 and 11 more.