CVE-2023-48228
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
44.8%
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.
Affected configurations
| Vendor | Product | Version | CPE |
|---|---|---|---|
| goauthentik | authentik | * | cpe:2.3:a:goauthentik:authentik:*:*:*:*:*:*:*:* |
References
github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225
github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6
github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5
github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14
github.com/goauthentik/authentik/pull/7666
github.com/goauthentik/authentik/pull/7668
github.com/goauthentik/authentik/pull/7669
github.com/goauthentik/authentik/releases/tag/version%2F2023.10.4
github.com/goauthentik/authentik/releases/tag/version%2F2023.8.5
github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3
Related
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
44.8%