9.8

CVE-2023-48228

Exploit

OAuth2: PKCE can be fully circumvented

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Goauthentik ≫ Authentik Version < 2023.8.5
Goauthentik ≫ Authentik Version >= 2023.10.0 < 2023.10.4
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.24% 0.652
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
security-advisories@github.com 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-287 Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

https://github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225
Product
https://github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6
Patch
https://github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5
Patch
https://github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14
Patch
https://github.com/goauthentik/authentik/pull/7666
Patch
https://github.com/goauthentik/authentik/pull/7668
Patch
https://github.com/goauthentik/authentik/pull/7669
Patch
https://github.com/goauthentik/authentik/releases/tag/version%2F2023.10.4
Release Notes
https://github.com/goauthentik/authentik/releases/tag/version%2F2023.8.5
Release Notes
https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3
Vendor Advisory
Exploit