CVE-2023-48228
Last modified
CVE-2023-48228 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 1.24% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Goauthentik | Authentik | < 2023.8.5 |
| Goauthentik | Authentik | >= 2023.10.0, < 2023.10.4 |
References
- https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3Exploit, Vendor Advisory
- https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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