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CVE-2023-23934— Wrkzeug's incorrect parsing of nameless cookies leads to __Host- cookies bypass

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，该漏洞源于浏览器可能允许看起来像“=value”而不是“key=value”的“无名”cookie。

CVSS 2.6 · Low EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process
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I. Basic Information for CVE-2023-23934

Vulnerability Information
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Vulnerability Title
Wrkzeug's incorrect parsing of nameless cookies leads to __Host- cookies bypass
Source: CVE Program / CVE List V5
Vulnerability Description
Werkzeug is a comprehensive WSGI web application library. Browsers may allow "nameless" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key. The issue is fixed in Werkzeug 2.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Pallets Werkzeug 输入验证错误漏洞
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，该漏洞源于浏览器可能允许看起来像“=value”而不是“key=value”的“无名”cookie。
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-2023-23934

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III. Intelligence Information for CVE-2023-23934

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Patches & Fixes for CVE-2023-23934 (1)

Vendor Advisories for CVE-2023-23934 (3)

Other References for CVE-2023-23934 (1)

IV. Related Vulnerabilities

Same product: werkzeug
Same vendor: pallets
Same weakness: CWE-20

V. Comments for CVE-2023-23934

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