Azure Key Vault
by Microsoft
Covered
9
controls
Partial
2
controls
Gaps
2
controls
Overview
Azure Key Vault by Microsoft is an encryption & key management solution that covers 9 NIST 800-171 controls (8% total coverage). It addresses key requirements in the encryption & key management domain for defense contractors pursuing CMMC compliance.
Controls Covered (9)
Implementation Notes
Deploy Azure Key Vault with FIPS-validated configurations. Integrate with your SIEM for centralized audit logging. Review partial controls quarterly to identify supplementary tooling needs.
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Implementation Guidance for Azure Key Vault
Configure Azure Key Vault for NIST 800-171 compliance by implementing proper access controls and encryption key management. For SC-12 (Cryptographic Key Establishment), enable Azure Key Vault's Hardware Security Module (HSM) backing and configure key rotation policies with 90-day intervals. Set up proper RBAC permissions limiting key access to essential personnel only. For SC-13 (Cryptographic Protection), configure Key Vault to generate FIPS 140-2 Level 2 validated keys and implement separate key vaults for different classification levels. For AC-3 (Access Enforcement), integrate with Azure AD and enable Privileged Identity Management (PIM) for just-in-time access to sensitive keys. Configure diagnostic logging to Azure Monitor and enable Key Vault access policies with principle of least privilege. Generate assessment evidence through Key Vault audit logs, access reports, and key usage analytics available in Azure Security Center. Integrate with Azure Information Protection for document encryption, Azure Disk Encryption for storage protection, and Azure SQL TDE for database encryption. Common misconfigurations include overly permissive access policies, disabled audit logging, software-only key protection instead of HSM backing, and failure to implement proper key rotation schedules. Ensure purge protection is enabled and configure proper backup policies to prevent data loss during CMMC assessments.
Gap Analysis & Compensating Controls
Azure Key Vault's 8% coverage leaves significant gaps in NIST 800-171 compliance, particularly in access control (AC) and system protection (SC) families beyond cryptographic controls. The tool doesn't address AC-2 (Account Management) or AC-7 (Unsuccessful Logon Attempts), requiring additional identity management solutions like Azure AD Premium with conditional access policies and sign-in risk detection. SC-7 (Boundary Protection) gaps need network security tools such as Azure Firewall or third-party NGFW solutions. Compensating controls should include Azure Sentinel for security monitoring, Microsoft Defender for endpoint protection, and Azure Policy for configuration management. Document these gaps in your System Security Plan (SSP) by clearly delineating Key Vault's cryptographic responsibilities versus other security domains. In your Plan of Action and Milestones (POA&M), prioritize identity and access management gaps first, as these carry higher CMMC assessment weight. Network boundary protection should follow, then endpoint security controls. Key Vault serves as a foundational component but requires integration with a comprehensive security stack including SIEM, endpoint detection, and network monitoring tools to achieve meaningful NIST 800-171 compliance coverage.
Compliance Cost Estimate
Azure Key Vault pricing ranges from $0.03-$1.00 per transaction for standard operations, with HSM-protected keys costing $1.00-$5.00 per key per month. For defense contractors, expect $2,000-$8,000 annually for small implementations (100-500 keys) and $15,000-$50,000 for enterprise deployments with HSM backing and high transaction volumes. Implementation costs include 20-40 hours of security architect time ($3,000-$8,000) for proper RBAC configuration and integration setup. Ongoing monitoring requires Azure Security Center Premium ($15/server/month) for compliance dashboards. Compared to competitors like HashiCorp Vault ($7,000-$25,000/year) or AWS KMS ($1.00-$3.00/key/month), Azure Key Vault offers competitive pricing with strong NIST 800-171 alignment. Total cost of ownership typically 15-25% lower than on-premises HSM solutions while providing better audit capabilities for CMMC assessments.
Compliance Cross-References
Azure Key Vault directly satisfies DFARS 252.204-7012 encryption requirements by providing FIPS 140-2 validated cryptographic key management for protecting Controlled Unclassified Information (CUI). For CMMC Level 2, Key Vault addresses SC.L2-3.13.11 (cryptographic key establishment) and SC.L2-3.13.16 (data-at-rest protection), representing approximately 10% of required assessment objectives. FedRAMP controls SC-12, SC-13, and portions of SC-8 are satisfied through Key Vault's encrypted key storage and transmission capabilities. However, CMMC domains like Access Control (AC), Audit and Accountability (AU), and System and Communications Protection (SC) beyond encryption require additional tools. Key Vault integration with Azure AD satisfies some IA.L2-3.5.7 requirements for authenticator management, but complete CMMC Level 2 compliance requires supplementary solutions for asset management (AM), configuration management (CM), and incident response (IR). Document Key Vault's role in your CMMC assessment as the cryptographic foundation, with clear boundaries showing where additional security controls begin. This targeted approach demonstrates mature security architecture understanding to C3PAOs while avoiding scope creep in Key Vault's specific compliance domain.
Frequently Asked Questions
How many NIST 800-171 controls does Azure Key Vault cover?
Azure Key Vault covers 9 of 110 NIST 800-171 controls (8%), with 2 partially covered and 2 gaps.
Can Azure Key Vault alone satisfy CMMC Level 2?
No single tool covers all 110 NIST 800-171 controls. Azure Key Vault covers 8% and should be part of a layered security stack addressing the remaining controls.
What controls does Azure Key Vault not cover?
Azure Key Vault does not cover controls pe-3-10-1, si-3-14-1. These require supplementary solutions such as physical security controls, additional access management, or media protection tools.
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