Fastify up to 3.29.3/4.10.1 Content-Type cross-site request forgery

Summaryinfo

A vulnerability classified as problematic was found in Fastify up to 3.29.3/4.10.1. This impacts an unknown function of the component Content-Type Handler. Such manipulation leads to cross-site request forgery. This vulnerability is documented as CVE-2022-41919. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Fastify up to 3.29.3/4.10.1. Affected by this issue is an unknown function of the component Content-Type Handler. The manipulation with an unknown input leads to a cross-site request forgery vulnerability. Using CWE to declare the problem leads to CWE-352. The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request. Impacted is integrity. CVE summarizes:

Fastify is a web framework with minimal overhead and plugin architecture. The attacker can use the incorrect `Content-Type` to bypass the `Pre-Flight` checking of `fetch`. `fetch()` requests with Content-Type’s essence as "application/x-www-form-urlencoded", "multipart/form-data", or "text/plain", could potentially be used to invoke routes that only accepts `application/json` content type, thus bypassing any CORS protection, and therefore they could lead to a Cross-Site Request Forgery attack. This issue has been patched in version 4.10.2 and 3.29.4. As a workaround, implement Cross-Site Request Forgery protection using `@fastify/csrf'.

The weakness was released 11/23/2022 as GHSA-3fjj-p79j-c9hh. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2022-41919 since 09/30/2022. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 3.29.4 or 4.10.2 eliminates this vulnerability. Applying the patch 62dde76f1f7aca76e38625fe8d983761f26e6fc9 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.

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Productinfo

Name

• Fastify

Version

• 3.29.0
• 3.29.1
• 3.29.2
• 3.29.3
• 4.10.0
• 4.10.1

License

• open-source

Website

• Product: https://github.com/fastify/fastify/

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