CVE-2023-48228
authentik is an open-source identity provider.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.24% probability · 67th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- goauthentik/authentik
- Source
- security-advisories@github.com
References
- https://github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225Product
- https://github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6Patch
- https://github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5Patch
- https://github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14Patch
- https://github.com/goauthentik/authentik/pull/7666Patch
- https://github.com/goauthentik/authentik/pull/7668Patch
- https://github.com/goauthentik/authentik/pull/7669Patch
- https://github.com/goauthentik/authentik/releases/tag/version%2F2023.10.4Release Notes
- https://github.com/goauthentik/authentik/releases/tag/version%2F2023.8.5Release Notes
- https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3Exploit, Vendor Advisory
- https://github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225Product
- https://github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6Patch
- https://github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5Patch
- https://github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14Patch
- https://github.com/goauthentik/authentik/pull/7666Patch
- https://github.com/goauthentik/authentik/pull/7668Patch
- https://github.com/goauthentik/authentik/pull/7669Patch
- https://github.com/goauthentik/authentik/releases/tag/version%2F2023.10.4Release Notes
- https://github.com/goauthentik/authentik/releases/tag/version%2F2023.8.5Release Notes
- https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.