Vulnerability · Published Apr 21, 2023 · Assigned by GitHub_M
CVE-2023-29020Cross site request forgery token fixation in fastify-passport
Medium 6.5
In plain English
A medium-severity session fixation in fastify-passport from fastify. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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`.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @fastify/passport | 1.1.0 | GHSA-2ccf-ffrj-m4qw |
| npm | @fastify/passport | 2.3.0 | GHSA-2ccf-ffrj-m4qw |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| fastify | fastify-passport | < 1.1.0>= 2.0.0, < 2.3.0 |
Weakness: CWE-384, CWE-352 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
References
- https://github.com/fastify/fastify-passport/security/advisories/GHSA-2ccf-ffrj-m4qw x_refsource_CONFIRM
- https://github.com/fastify/fastify-passport/commit/07c90feab9cba0dd4779e47cfb0717a7e2f01d3d x_refsource_MISC
- https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#synchronizer-token-pattern x_refsource_MISC
- https://owasp.org/www-community/attacks/csrf x_refsource_MISC