Platform Security Maturity Model

Overview

The Platform Security Maturity Model (PSMM) is a structured framework designed to evaluate and enhance the security posture of computing platforms throughout their lifecycle. It helps organizations systematically identify gaps and implement improvements in platform security controls to reduce vulnerabilities and manage risks effectively.

Primary Objectives

• Enable consistent assessment and improvement of platform security capabilities across diverse environments
• Benefit executives by providing strategic visibility, auditors through standardized evaluation criteria, and engineers via actionable security requirements
• Support informed decision-making and accountability by defining clear maturity levels and control ownership

Scope & Applicability

• Applicable to organizations of various sizes and industries that develop, deploy, or manage computing platforms, including hardware, firmware, and software components
• Covers security domains such as platform integrity, secure boot, firmware protection, cryptographic services, and hardware trust anchors; excludes broader enterprise security domains like network or application security
• Requires foundational governance structures, comprehensive asset inventories, and data classification processes to contextualize platform security risks

Core Structure

• Composed of maturity levels that define progressive capabilities, grouped into domains such as hardware security, firmware security, and platform management
• Organized hierarchically from overarching security principles to detailed policies, specific controls, and verification tests
• Utilizes standardized terminology with control identifiers and categories facilitating mapping to other security frameworks

How It Is Used

• Typically adopted through phased rollouts starting with baseline assessments followed by targeted improvements and pilot implementations in critical platform areas
• Assessment workflows include gap analyses, formal audits, and attestation processes to validate maturity levels
• Supports engineering workflows by integrating security requirements into design reviews, software development lifecycle (SDLC) gates, and backlog prioritization

Implementation Artifacts

• Includes derived policies, standards, and procedures tailored to platform security objectives
• Maintains a control library with mappings to established frameworks such as NIST SP 800-193 and ISO/IEC 20246
• Collects evidence artifacts like configuration files, audit logs, change tickets, and screenshots to demonstrate control implementation and effectiveness

Measurement & Maturity

• Defines key performance indicators (KPIs) and key risk indicators (KRIs) focusing on control coverage, remediation timelines, and testing frequency
• Employs a maturity scoring approach with defined levels ranging from initial/ad hoc to optimized and continuously improving capabilities
• Establishes common baselines distinguishing minimum viable controls from advanced security practices for platform protection

Common Pitfalls

• Relying solely on checklist compliance without aligning controls to actual platform risk scenarios
• Overextending scope leading to framework sprawl or under-scoping that misses critical platform components
• Failing to assign control ownership, resulting in weak evidence collection and outdated documentation

Integration & Mapping

• Provides crosswalks to other frameworks and standards such as NIST Cybersecurity Framework, ISO/IEC 27001, and hardware security guidelines
• Integrates with governance, risk, and compliance (GRC) systems, security operations centers (SOC), incident response (IR) processes, SDLC workflows, and vendor risk management
• Supports tooling integration including GRC platforms and automated control testing solutions to streamline assessments and reporting

When Not to Use It

• May be unsuitable for organizations seeking lightweight or narrowly scoped security approaches due to its comprehensive and detailed nature
• Not ideal if regulatory requirements focus primarily on application or network security rather than platform-level controls
• Organizations may consider staged or simplified models when resources or maturity levels are limited

Standards & References

• Primary references include official Platform Security Maturity Model documentation and related standards such as NIST SP 800-193 (Platform Firmware Resiliency Guidelines)
• Companion materials often encompass implementation guides, control mapping documents, and maturity assessment templates