Lack of protection against cookie tossing attacks in fastify-csrf
CVE-2021-29624 · GHSA-rc4q-9m69-gqp8
- Affected
- npm fastify-csrf < 3.1.0
- Fixed in
- 3.1.0· Vendor fix available
- Issue
- Impact Users that used fastify-csrf with the "double submit" mechanism using cookies with an application deployed across multiple subdomains, e.g. "heroku"-style platform as a service. Patches Version 3.1.0 of the fastify-csrf fixes it. See https://github.com/fastify/fastify-csrf/pull/51 and https://github.com/fastify/csrf/pull/2. The user of the module would need to supply a userInfo when generating the CSRF token to fully implement the protection on their end. This is needed only for applications hosted on different subdomains. Workarounds None available. References 1. https://cheatsheetseries.owasp.org/cheatsheets/Cross-SiteRequestForgeryPreventionCheatSheet.html 2. https://owasp.org/www-pdf-archive/DavidJohansson-DoubleDefeatofDouble-SubmitCookie.pdf Credits This vulnerability was found by Xhelal Likaj <xhelallikaj20@gmail.com. For more information If you have any questions or comments about this advisory: Open an issue in fastify-csrf Email us at hello@matteocollina.com
Recommended action: Upgrade to 3.1.0 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.