Detections
Analytics
CVE-2023-48228
critical
Description
authentik is an open-source identity provider. When initialising a oauth2 flow with a `code_challenge` and `code_method` (thus requesting PKCE), the single sign-on provider (authentik) must check if there is a matching and existing `code_verifier` during the token step. Prior to versions 2023.10.4 and 2023.8.5, authentik checks if the contents of `code_verifier` is matching only when it is provided. When it is left out completely, authentik simply accepts the token request with out it; even when the flow was started with a `code_challenge`. authentik 2023.8.5 and 2023.10.4 fix this issue.
References
https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3
https://github.com/goauthentik/authentik/releases/tag/version%2F2023.8.5
https://github.com/goauthentik/authentik/releases/tag/version%2F2023.10.4
https://github.com/goauthentik/authentik/pull/7669
https://github.com/goauthentik/authentik/pull/7668
https://github.com/goauthentik/authentik/pull/7666
https://github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14
https://github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5
https://github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6