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CVE-2023-25577— Werkzeug may allow high resource usage when parsing multipart form data with many fields

Quick assessment

Affected
pallets werkzeug
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pallets Werkzeug是一款WSGI Web应用程序库。 Pallets Werkzeug 2.2.3之前版本存在安全漏洞，该漏洞源于Werkzeug multipart表单数据解析器可以解析无限数量的文件、字节部分，但每个部分都需要 CPU 时间来解析，并且可能会使用更多内存，如果向 、 、 或 的端点发出请求，则可能会导致意外

CVSS 7.5 · High EPSS 1.42% · P72

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-25577

Vulnerability Information
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Vulnerability Title
Werkzeug may allow high resource usage when parsing multipart form data with many fields
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Pallets Werkzeug 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pallets Werkzeug是一款WSGI Web应用程序库。 Pallets Werkzeug 2.2.3之前版本存在安全漏洞，该漏洞源于Werkzeug multipart表单数据解析器可以解析无限数量的文件、字节部分，但每个部分都需要 CPU 时间来解析，并且可能会使用更多内存，如果向 `request.data`、`request.form`、`request.files` 或 `request.get_data(parse_form_data=False)` 的端点发出请求，则可能会导致意外
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pallets werkzeug < 2.2.3 -

II. Public POCs for CVE-2023-25577

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III. Intelligence Information for CVE-2023-25577

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Patches & Fixes for CVE-2023-25577 (1)

Vendor Advisories for CVE-2023-25577 (3)

Other References for CVE-2023-25577 (1)

IV. Related Vulnerabilities

Same product: werkzeug
Same vendor: pallets
Same weakness: CWE-770

V. Comments for CVE-2023-25577

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