Pallets Werkzeug up to 2.2.2 Cookie input validation

Summaryinfo

A vulnerability was found in Pallets Werkzeug up to 2.2.2. It has been classified as problematic. This impacts an unknown function of the component Cookie Handler. This manipulation causes input validation. This vulnerability is registered as CVE-2023-23934. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Pallets Werkzeug up to 2.2.2. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component Cookie Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published 02/15/2023 as GHSA-px8h-6qxv-m22q. The advisory is shared at github.com. This vulnerability is known as CVE-2023-23934 since 01/19/2023. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 264500 (Linux Distros Unpatched Vulnerability : CVE-2023-23934), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.2.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch cf275f42acad1b5950c50ffe8ef58fe62cdce028 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (264500). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Pallets

Name

• Werkzeug

Version

• 2.2.0
• 2.2.1
• 2.2.2

License

• open-source

Website

• Product: https://github.com/pallets/werkzeug/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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