CVE-2023-48228
Dashboard / Vulnerabilities / CVE-2023-48228
CVE-2023-48228
Summary: OAuth2: PKCE can be fully circumvented
Details: 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/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225, https://github.com/goauthentik/authentik/releases/tag/version%2F2023.10.4, https://github.com/goauthentik/authentik/releases/tag/version%2F2023.8.5, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/48xxx/CVE-2023-48228.json, https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3, https://nvd.nist.gov/vuln/detail/CVE-2023-48228, https://github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6, https://github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5, https://github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14, https://github.com/goauthentik/authentik/pull/7666, https://github.com/goauthentik/authentik/pull/7668, https://github.com/goauthentik/authentik/pull/7669
Affected packages
Package
Name:
Purl:
