CVE-2022-24761

描述

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.

如何修補 CVE-2022-24761

要修補 CVE-2022-24761,請將受影響套件升級到下列已修補版本。

• —升級至 1.4.4-1.1+deb11u1 或更新版本
• —升級至 1.2.0~b2-2+deb10u1 或更新版本
• —升級至 2.1.1 或更新版本
• —升級至 9e0b8c801e4d505c2ffc91b891af4ba48af715e0 或更新版本

CVE-2022-24761 正在被利用嗎?

低 — EPSS 為 1.7%,目前沒有觀察到大規模利用活動。

受影響套件(4)

• from 0, < 1.4.4-1.1+deb11u1
• from 0, < 1.2.0~b2-2+deb10u1
• from 0, < 2.1.1
• from 0, < 9e0b8c801e4d505c2ffc91b891af4ba48af715e0 | from 0, < 2.1.1

CVSS 分數

參考連結(9)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2022-24761
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2022-24761
• PATCHgithub.com/Pylons/waitress
• WEBgithub.com/Pylons/waitress/commit/9e0b8c801e4d505c2ffc91b891af4ba48af715e0
• WEB