CVE-2021-29624 Lack of protection against cookie tossing attacks in fastify-csrf
Attackers can bypass CSRF protection in multi-subdomain deployments if developers fail to supply user-specific data during token generation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-29624?
CVE-2021-29624 is a medium-severity vulnerability in fastify-csrf, published on 19 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
fastify-csrf is an open-source plugin helps developers protect their Fastify server against CSRF attacks. Versions of fastify-csrf prior to 3.1.0 have a "double submit" mechanism using cookies with an application deployed across multiple subdomains, e.g. "heroku"-style platform as a service. Version 3.1.0 of the fastify-csrf fixes it. the vulnerability. 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.
Which versions are affected by CVE-2021-29624?
2 open source packages ship an affected version, including fastify-csrf. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
fastify-csrf npm | All versions | 3.1.0 |
fastify-csrf npm | All versions | 3.1.0 |
Products include Fastify Fastify-Csrf.
How do I fix CVE-2021-29624?
Upgrade fastify-csrf to 3.1.0 or later.
Is CVE-2021-29624 being exploited?
There is no known exploitation of CVE-2021-29624 in the wild and no public exploit code.
Other vulnerabilities in fastify-csrf
Sources
Also known as GHSA-rc4q-9m69-gqp8.