CVE-2023-36456
Vulnérabilité élevée dans authentik (goauthentik)
Description
authentik is an open-source Identity Provider. Prior to versions 2023.4.3 and 2023.5.5, authentik does not verify the source of the X-Forwarded-For and X-Real-IP headers, both in the Python code and the go code. Only authentik setups that are directly accessible by users without a reverse proxy are susceptible to this. Possible spoofing of IP addresses in logs, downstream applications proxied by (built in) outpost, IP bypassing in custom flows if used. This poses a possible security risk when someone has flows or policies that check the user's IP address, e.g. when they want to ignore the user's 2 factor authentication when the user is connected to the company network. A second security risk is that the IP addresses in the logfiles and user sessions are not reliable anymore. Anybody can spoof this address and one cannot verify that the user has logged in from the IP address that is in their account's log. A third risk is that this header is passed on to the proxied application behind an outpost. The application may do any kind of verification, logging, blocking or rate limiting based on the IP address, and this IP address can be overridden by anybody that want to. Versions 2023.4.3 and 2023.5.5 contain a patch for this issue.
Gravité et risque d'exploitation
CVE-2023-36456 obtient un score CVSS de 8.3/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.79 %, ce qui la place devant 55.6 % des CVE référencées.
Que faire ?
- Vérifiez si authentik (versions < 2023.4.3, >= 2023.5.0, < 2023.5.5) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://github.com/goauthentik/authentik/security/advisories/GHSA-cmxp-jcw7-jjjv
- https://github.com/goauthentik/authentik/commit/15026748d19d490eb2baf9a9566ead4f805f7dff
- https://github.com/goauthentik/authentik/commit/c07a48a3eccbd7b23026f72136d3392bbc6f795a
- https://goauthentik.io/docs/releases/2023.4#fixed-in-202343
- https://goauthentik.io/docs/releases/2023.5#fixed-in-202355
