CVE-2023-29020: Cross site request forgery token fixation in fastify-passport
First published: Fri Apr 21 2023(Updated: )
@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`.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Passport.js | <1.1.0 | |
| Passport.js | >=2.0.0<2.3.0 |
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Reference Links
- 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://github.com/fastify/fastify-passport/security/advisories/GHSA-2ccf-ffrj-m4qw
- https://owasp.org/www-community/attacks/csrf
Frequently Asked Questions
What is CVE-2023-29020 vulnerability?
CVE-2023-29020 is a vulnerability in @fastify/passport that allows bypassing CSRF protection when used with @fastify/csrf-protection in certain versions.
How severe is CVE-2023-29020?
CVE-2023-29020 has a severity rating of 6.5 (medium).
Is Fastify Passport affected by CVE-2023-29020?
Fastify Passport versions up to 1.1.0 and between 2.0.0 and 2.3.0 are affected by CVE-2023-29020.
How can the CSRF protection bypass in Fastify Passport be exploited?
The CSRF protection bypass can be exploited by network and same-site attackers when @fastify/passport is combined with @fastify/csrf-protection in affected versions.
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