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Security Advisories: GSA_kwCzR0hTQS1ocmZ2LW1xcDgtcTVyd84AA2oc

Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning

Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.

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. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.

Permalink: https://github.com/advisories/GHSA-hrfv-mqp8-q5rw
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1ocmZ2LW1xcDgtcTVyd84AA2oc
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: about 1 year ago
Updated: 15 days ago


CVSS Score: 5.7
CVSS vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Percentage: 0.00104
EPSS Percentile: 0.44064

Identifiers: GHSA-hrfv-mqp8-q5rw, CVE-2023-46136
References: Repository: https://github.com/pallets/werkzeug
Blast Radius: 27.4

Affected Packages

pypi:werkzeug
Dependent packages: 711
Dependent repositories: 63,618
Downloads: 139,627,470 last month
Affected Version Ranges: < 2.3.8, >= 3.0.0, < 3.0.1
Fixed in: 2.3.8, 3.0.1
All affected versions: 0.3.1, 0.4.1, 0.5.1, 0.6.1, 0.6.2, 0.7.1, 0.7.2, 0.8.1, 0.8.2, 0.8.3, 0.9.1, 0.9.2, 0.9.3, 0.9.4, 0.9.5, 0.9.6, 0.10.1, 0.10.2, 0.10.3, 0.10.4, 0.11.1, 0.11.2, 0.11.3, 0.11.4, 0.11.5, 0.11.6, 0.11.7, 0.11.8, 0.11.9, 0.11.10, 0.11.11, 0.11.12, 0.11.13, 0.11.14, 0.11.15, 0.12.1, 0.12.2, 0.14.1, 0.15.0, 0.15.1, 0.15.2, 0.15.3, 0.15.4, 0.15.5, 0.15.6, 0.16.0, 0.16.1, 1.0.0, 1.0.1, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.1.0, 2.1.1, 2.1.2, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.3.6, 2.3.7, 3.0.0
All unaffected versions: 2.3.8, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.1.0, 3.1.1, 3.1.2, 3.1.3