Werk #16830: Bruteforce protection for two factor authentication

Prior to this werk, Two Factor Authentication failures could not trigger account lockout. All three methods will now count towards failed login attempts against a user's account. As a result, an attacker could try to brute-force and therefore bypass user's two factor protections without triggering the lockout mechanism.

This vulnerability was identified in a commissioned penetration test conducted by PS Positive Security GmbH.

Affected Versions:

• 2.3.0

Indicators of Compromise:

Failed two factor authentication attempts can be identified within a Checkmk site's security log file (~/var/log/security.log).

Vulnerability Management:

We have rated the issue with a CVSS Score of 5.9 (Medium) with the following CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N and assigned CVE CVE-2024-28833.

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