Red Hat OpenShift: CVE-2023-25577: python-werkzeug: high resource usage when parsing multipart form data with many fields

Red Hat OpenShift: CVE-2023-25577: python-werkzeug: high resource usage when parsing multipart form data with many fields

Severity

8

CVSS

(AV:N/AC:L/Au:N/C:N/I:N/A:C)

Published

02/14/2023

Created

05/05/2023

Added

04/06/2023

Modified

01/30/2025

Description

Werkzeug is a comprehensive WSGI web application library. Prior to version 2.2.3, Werkzeug's multipart form data parser will parse an unlimited number of parts, including file parts. Parts can be a small amount of bytes, but each requires CPU time to parse and may use more memory as Python data. If a request can be made to an endpoint that accesses `request.data`, `request.form`, `request.files`, or `request.get_data(parse_form_data=False)`, it can cause unexpectedly high resource usage. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. Unlimited file parts can use up memory and file handles. If many concurrent requests are sent continuously, this can exhaust or kill all available workers. Version 2.2.3 contains a patch for this issue.

Solution(s)

• linuxrpm-upgrade-python-werkzeug

References

• https://attackerkb.com/topics/cve-2023-25577
• CVE - 2023-25577
• RHSA-2023:1018
• RHSA-2023:1281
• RHSA-2023:1325
• RHSA-2023:7341
• RHSA-2023:7473