GHSA-2ccf-ffrj-m4qw

The [CSRF](https://owasp.org/www-community/attacks/csrf) protection enforced by the `@fastify/csrf-protection` library, when combined with `@fastify/passport`, can be bypassed by network and same-site attackers.

## Details `fastify/csrf-protection` implements the [synchronizer token pattern](https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#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](https://canitakeyoursubdomain.name/) 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.

## Fix As a solution, newer versions of `@fastify/passport` include the configuration options

* `clearSessionOnLogin (default: true)` and * `clearSessionIgnoreFields (default: ['session'])`

to clear all the session attributes by default, preserving those explicitly defined in `clearSessionIgnoreFields`.

## Credits * Pedro Adão (@pedromigueladao), [Instituto Superior Técnico, University of Lisbon](https://tecnico.ulisboa.pt/) * Marco Squarcina (@lavish), [Security & Privacy Research Unit, TU Wien](https://secpriv.wien/)