Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS14ZzlmLWc3ZzctMjMyM84AAxpn

High resource usage when parsing multipart form data with many fields

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.

Permalink: https://github.com/advisories/GHSA-xg9f-g7g7-2323
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS14ZzlmLWc3ZzctMjMyM84AAxpn
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 1 year ago
Updated: 9 months ago

CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Identifiers: GHSA-xg9f-g7g7-2323, CVE-2023-25577
References:

• https://github.com/pallets/werkzeug/security/advisories/GHSA-xg9f-g7g7-2323
• https://nvd.nist.gov/vuln/detail/CVE-2023-25577
• https://github.com/pallets/werkzeug/commit/517cac5a804e8c4dc4ed038bb20dacd038e7a9f1
• https://github.com/pallets/werkzeug/releases/tag/2.2.3
• https://www.debian.org/security/2023/dsa-5470
• https://security.netapp.com/advisory/ntap-20230818-0003/
• https://github.com/advisories/GHSA-xg9f-g7g7-2323

Repository: https://github.com/pallets/werkzeug
Blast Radius: 36.0

Affected Packages