CVE-2024-52289 Information

Description

authentik is an open-source identity provider. Redirect URIs in the OAuth2 provider in authentik are checked by RegEx comparison. When no Redirect URIs are configured in a provider authentik will automatically use the first redirect_uri value received as an allowed redirect URI without escaping characters that have a special meaning in RegEx. Similarly the documentation did not take this into consideration either. Given a provider with the Redirect URIs set to https://foo.example.com an attacker can register a domain fooaexample.com and it will correctly pass validation. authentik 2024.8.5 and 2024.10.3 fix this issue. As a workaround When configuring OAuth2 providers make sure to escape any wildcard characters that are not intended to function as a wildcard for example replace . with \..

Reference

https://github.com/goauthentik/authentik/commit/85bb638243c8d7ea42ddd3b15b3f51a90d2b8c54 https://github.com/goauthentik/authentik/security/advisories/GHSA-3q5w-6m3x-64gj