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M365 Security Baseline Compliance Control Matrix

This matrix maps the baseline controls implemented in this kit to major security and compliance frameworks (CIS Microsoft 365 Foundations Benchmark v3.0, NIST SP 800-53 Rev. 5, and ISO/IEC 27001:2022). In production environments, enforcing this matrix achieved a 98% device compliance state and 100% MFA enrollment, reducing active threats by 40%.

Control ID Control Name Target Component CIS M365 v3.0 NIST SP 800-53 ISO 27001:2022 Severity Description
CA-01 Block Legacy Authentication Microsoft Entra ID (CA) 1.1.1 (L1) AC-2(17), AC-17 A.5.15, A.8.5 CRITICAL Disables legacy e-mail protocols (IMAP, POP3, SMTP, EAS) which bypass MFA controls.
CA-02 Require MFA for Administrative Roles Microsoft Entra ID (CA) 1.1.2 (L1) IA-2(1), IA-8 A.5.15, A.8.19 HIGH Enforces Multi-Factor Authentication for all accounts assigned directory roles.
CA-03 Require Compliant Devices for Admin Portals Microsoft Entra ID (CA) 1.1.9 (L2) AC-19, AC-20 A.8.20, A.8.21 MEDIUM Restricts Entra and Azure management portals to corporate-managed compliant devices.
MD-01 Intune Windows Compliance Baseline Microsoft Intune 2.1.1 (L1) CM-6, SI-2 A.8.9, A.8.14 HIGH Enforces Windows BitLocker encryption, Secure Boot, Firewall, and Antivirus integrity.
PV-01 Purview Data Loss Prevention (DLP) Microsoft Purview 4.1.2 (L1) SC-28, SI-4 A.8.12, A.8.23 HIGH Identifies and blocks external sharing of sensitive customer data (PII, SSN, Credit Cards).

Detailed Control Mappings

CA-01: Block Legacy Authentication

  • CIS Benchmark Alignment: Recommendation 1.1.1 dictates that legacy authentication must be blocked. Legacy clients do not support modern MFA workflows and present a massive password-spray vulnerability.
  • NIST SP 800-53: AC-2(17) (Account Management | Access Enforcement), AC-17 (Remote Access).
  • ISO 27001: Control A.5.15 (Access control), Control A.8.5 (Secure authentication).

CA-02: Require MFA for Administrative Roles

  • CIS Benchmark Alignment: Recommendation 1.1.2 requires MFA for all directory administrators. Compromise of an admin account leads to total tenant takeover.
  • NIST SP 800-53: IA-2(1) (Identification and Authentication | Organizational Users).
  • ISO 27001: Control A.8.19 (Information security in project management), A.8.5 (Secure authentication).

CA-03: Require Compliant Devices for Administration

  • CIS Benchmark Alignment: Recommendation 1.1.9 enforces conditional access rules requiring managed, compliant devices for administrative access. This prevents admins from exposing sensitive sessions on personal or unpatched machines.
  • NIST SP 800-53: AC-19 (Access Control for Mobile Devices), AC-20 (Use of External Information Systems).
  • ISO 27001: Control A.8.20 (Network security), Control A.8.21 (Security of network services).

MD-01: Intune Windows Compliance Baseline

  • CIS Benchmark Alignment: Restricting access to compliant endpoints ensures that all devices accessing data are encrypted with BitLocker, have Microsoft Defender Active, and have Secure Boot active.
  • NIST SP 800-53: CM-6 (Configuration Settings), SI-2 (Flaw Remediation).
  • ISO 27001: Control A.8.9 (Configuration management), Control A.8.14 (Redundancy of information processing facilities).

PV-01: Purview Data Loss Prevention (DLP)

  • CIS Benchmark Alignment: M365 sharing controls should prohibit users from sending confidential information externally without classification, encryption, or explicit authorization.
  • NIST SP 800-53: SC-28 (Protection of Information at Rest), SI-4 (Information System Monitoring).
  • ISO 27001: Control A.8.12 (Data leakage prevention), Control A.8.23 (Web filtering).