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CVE-2024-47077

Reported by @quentinmit

Insufficient cross-provider token validation during introspection​

Summary​

Access tokens issued to one application can be stolen by that application and used to impersonate the user against any other proxy provider. Also, a user can steal an access token they were legitimately issued for one application and use it to access another application that they aren't allowed to access.

Details​

The proxy provider uses /application/o/introspect/ to validate bearer tokens provided in the Authorization header:

The implementation of this endpoint separately validates the client_id and client_secret (which are that of the proxy provider) and the token without validating that they correspond to the same provider.

Patches​

authentik 2024.6.5 and 2024.8.3 fix this issue.

For more information​

If you have any questions or comments about this advisory: