CVE-2023-35935 Information

Description

@fastify/oauth2 a wrapper around the simple-oauth2 library is vulnerable to cross site request forgery (CSRF) prior to version 7.2.0.. All versions of @fastify/oauth2 used a statically generated state parameter at startup time and were used across all requests for all users. The purpose of the Oauth2 state parameter is to prevent CSRF attacks. As such it should be unique per user and should be connected to the user’s session in some way that will allow the server to validate it. Version 7.2.0 changes the default behavior to store the state in a cookie with the http-only and same-site=lax attributes set. The state is now by default generated for every user. Note that this contains a breaking change in the checkStateFunction function which now accepts the full Request object. There are no known workarounds for the issue.

Reference

https://github.com/fastify/fastify-oauth2/commit/bff756b456cbb769080631af2beb85671ff4c79c https://github.com/fastify/fastify-oauth2/releases/tag/v7.2.0 https://auth0.com/docs/secure/attack-protection/state-parameters https://github.com/fastify/fastify-oauth2/security/advisories/GHSA-g8x5-p9qc-cf95