CVE-2022-24761

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 Pythons 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.

Risk Information

Base Score

7.5

MODERATE

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Score

Exploitation Probability

0.258

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2022-24761 are fixed in Python-waitress 2.1.1	Windows
production-quality pure-Python WSGI server (documentation) (USN-5364-1) python3-waitress_1.4.1-1ubuntu0.1_all.deb	Linux
production-quality pure-Python WSGI server (documentation) (USN-5364-1) python3-waitress_1.4.4-1.1ubuntu0.1_all.deb	Linux
SUSE-SU-2022:3731-1(SUSE Linux Enterprise Module for Basesystem 15-SP3 ) python3-waitress-1.4.3-150000.3.6.1.noarch.rpm	Linux
SUSE-SU-2022:3731-1(SUSE Linux Enterprise Module for Basesystem 15-SP4 ) python3-waitress-1.4.3-150000.3.6.1.noarch_15_SP4.rpm	Linux
waitress security update(DSA-5138-1) python3-waitress_1.4.4-1.1+deb11u1_all.deb	Linux
waitress security update(DSA-5138-1) python3-waitress_1.2.0~b2-2+deb10u1_all.deb	Linux
waitress security update(DSA-5138-1) python-waitress-doc_1.4.4-1.1+deb11u1_all.deb	Linux
waitress security update(DSA-5138-1) python-waitress-doc_1.2.0~b2-2+deb10u1_all.deb	Linux
waitress security update(DSA-5138-1) python-waitress_1.2.0~b2-2+deb10u1_all.deb	Linux
Vulnerabilities CVE-2022-24761 are fixed in Python-waitress for linux 2.1.1	Linux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234