Vulnerability CVE-2021-29624
Published: 2021-05-19   Modified: 2021-05-20

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.

Type:

CWE-565

 (Reliance on Cookies without Validation and Integrity Checking)

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Fastify -> Fastify-csrf 

 References:
https://github.com/fastify/fastify-csrf/releases/tag/v3.1.0
https://owasp.org/www-pdf-archive/David_Johansson-Double_Defeat_of_Double-Submit_Cookie.pdf
https://github.com/fastify/csrf/pull/2
https://github.com/fastify/fastify-csrf/security/advisories/GHSA-rc4q-9m69-gqp8
https://cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html
https://github.com/fastify/fastify-csrf/pull/51
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