CVE-2023-29020 Information

Description

@fastify/passport is a port of passport authentication library for the Fastify ecosystem. The CSRF (Cross-Site Request Forger) protection enforced by the @fastify/csrf-protection library when combined with @fastify/passport in affected versions can be bypassed by network and same-site attackers. fastify/csrf-protection implements the synchronizer token pattern (using plugins @fastify/session and @fastify/secure-session) by storing a random value used for CSRF token generation in the _csrf attribute of a user’s session. The @fastify/passport library does not clear the session object upon authentication preserving the _csrf attribute between pre-login and authenticated sessions. Consequently CSRF tokens generated before authentication are still valid. Network and same-site attackers can thus obtain a CSRF token for their pre-session fixate that pre-session in the victim’s browser via cookie tossing and then perform a CSRF attack after the victim authenticates. As a solution newer versions of @fastify/passport include the configuration options: clearSessionOnLogin (default: true) and clearSessionIgnoreFields (default: ['passport' 'session']) to clear all the session attributes by default preserving those explicitly defined in clearSessionIgnoreFields.

Reference

https://github.com/fastify/fastify-passport/security/advisories/GHSA-2ccf-ffrj-m4qw https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#synchronizer-token-pattern https://github.com/fastify/fastify-passport/commit/07c90feab9cba0dd4779e47cfb0717a7e2f01d3d https://owasp.org/www-community/attacks/csrf