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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-q5rwJSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1ocmZ2LW1xcDgtcTVyd84AA2oc
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 6 months ago
Updated: 5 months 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
Identifiers: GHSA-hrfv-mqp8-q5rw, CVE-2023-46136
References:
- https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw
- https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1
- https://nvd.nist.gov/vuln/detail/CVE-2023-46136
- https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2
- https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml
- https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9
- https://security.netapp.com/advisory/ntap-20231124-0008/
- https://github.com/advisories/GHSA-hrfv-mqp8-q5rw
Blast Radius: 27.4
Affected Packages
pypi:werkzeug
Dependent packages: 613Dependent repositories: 63,618
Downloads: 94,441,854 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