CVE-2024-47070: authentik vulnerable to password authentication bypass via X-Forwarded-For HTTP header

Vulnerability summary

CVE-2024-47070 is a critical (CVSS 9.1) Improper Authentication vulnerability in goauthentik authentik. EPSS estimates a 0.56% chance of exploitation in the next 30 days, higher than 46.8% of scored vulnerabilities.

Timeline

1. 27-09-2024
   PublishedVulnerability first disclosed.
2. 27-09-2024
   Last modifiedVulnerability information updated.

Description

authentik is an open-source identity provider. A vulnerability that exists in versions prior to 2024.8.3 and 2024.6.5 allows bypassing password login by adding X-Forwarded-For header with an unparsable IP address, e.g. `a`. This results in a possibility of logging into any account with a known login or email address. The vulnerability requires the authentik instance to trust X-Forwarded-For header provided by the attacker, thus it is not reproducible from external hosts on a properly configured environment. The issue occurs due to the password stage having a policy bound to it, which skips the password stage if the Identification stage is setup to also contain a password stage. Due to the invalid X-Forwarded-For header, which does not get validated to be an IP Address early enough, the exception happens later and the policy fails. The default blueprint doesn't correctly set `failure_result` to `True` on the policy binding meaning that due to this exception the policy returns false and the password stage is skipped. Versions 2024.8.3 and 2024.6.5 fix this issue.

• CWE-287Improper AuthenticationWhen an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.