Applications using @fastify/passport
for user authentication, in combination with @fastify/session
as the underlying session management mechanism, are vulnerable to session fixation attacks from network and same-site attackers.
fastify applications rely on the @fastify/passport
library for user authentication. The login and user validation are performed by the authenticate
function. When executing this function, the sessionId
is preserved between the pre-login and the authenticated session. Network and same-site attackers can hijack the victim's session by tossing a valid sessionId
cookie in the victim's browser and waiting for the victim to log in on the website.
As a solution, newer versions of @fastify/passport
regenerate sessionId
upon login, preventing the attacker-controlled pre-session cookie from being upgraded to an authenticated session.
{ "nvd_published_at": "2023-04-21T23:15:20Z", "github_reviewed_at": "2023-04-21T22:33:30Z", "github_reviewed": true, "severity": "HIGH", "cwe_ids": [ "CWE-384" ] }