CVE-2022-24761

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.
Configurations

Configuration 1 (hide)

cpe:2.3:a:agendaless:waitress:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

History

18 May 2022, 15:15

Type Values Removed Values Added
References
  • (DEBIAN) https://www.debian.org/security/2022/dsa-5138 -

13 May 2022, 01:15

Type Values Removed Values Added
References
  • (MLIST) https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html -

28 Mar 2022, 17:00

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown
v2 : 5.0
v3 : 7.5
References (CONFIRM) https://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36 - (CONFIRM) https://github.com/Pylons/waitress/security/advisories/GHSA-4f7p-27jc-3c36 - Third Party Advisory
References (MISC) https://github.com/Pylons/waitress/commit/9e0b8c801e4d505c2ffc91b891af4ba48af715e0 - (MISC) https://github.com/Pylons/waitress/commit/9e0b8c801e4d505c2ffc91b891af4ba48af715e0 - Patch, Release Notes, Third Party Advisory
References (MISC) https://github.com/Pylons/waitress/releases/tag/v2.1.1 - (MISC) https://github.com/Pylons/waitress/releases/tag/v2.1.1 - Release Notes, Third Party Advisory
CPE cpe:2.3:a:agendaless:waitress:*:*:*:*:*:*:*:*

17 Mar 2022, 13:39

Type Values Removed Values Added
New CVE

Information

Published : 2022-03-17 13:15

Updated : 2024-02-04 22:29


NVD link : CVE-2022-24761

Mitre link : CVE-2022-24761

CVE.ORG link : CVE-2022-24761


JSON object : View

Products Affected

debian

  • debian_linux

agendaless

  • waitress
CWE
CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')