Windows Server 2025 must be configured for name-based strong mappings for certificates.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-278173 | WN25-DC-000406 | SV-278173r1182146_rule | CCI-000213 | medium |
| Description | ||||
| Weak mappings give rise to security vulnerabilities and demand hardening measures. Certificate names must be correctly mapped to the intended user account in Active Directory. A lack of strong name-based mappings allows certain weak certificate mappings, such as Issuer/Subject AltSecID and User Principal Names (UPN) mappings, to be treated as strong mappings. | ||||
| STIG | Date | |||
| Microsoft Windows Server 2025 Security Technical Implementation Guide | 2026-02-20 | |||
Details
Check Text (C-278173r1182146_chk)
This applies to domain controllers. This is not applicable for member servers.
Verify the effective setting in Local Group Policy Editor.
Run gpedit.msc.
Navigate to Local Computer Policy >> Computer Configuration >> Administrative Template >> System >> KDC >> Allow name-based strong mappings for certificates.
If "Allow name-based strong mappings for certificates" is not "Enabled", this is a finding.
Fix Text (F-82608r1181931_fix)
Configure the policy value for Computer Configuration >> Administrative Template >> System >> KDC >> Allow name-based strong mappings for certificates to "Enabled".
The policy must contain exactly one certificate thumbprint per rule, with each rule represented as a tuple. Thumbprints must be unique and cannot be repeated in multiple rules. The sections of each tuple that are separated by semi-colons must be in the stated order, while the fields separated by commas can be in any order. The rules themselves are separated by new lines.