CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
EPSS
Percentile
30.5%
@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
.
cheatsheetseries.owasp.org/cheatsheets/Cross-Site_Request_Forgery_Prevention_Cheat_Sheet.html#synchronizer-token-pattern
github.com/fastify/fastify-passport/commit/07c90feab9cba0dd4779e47cfb0717a7e2f01d3d
github.com/fastify/fastify-passport/security/advisories/GHSA-2ccf-ffrj-m4qw
owasp.org/www-community/attacks/csrf