SA-15(5)—Attack Surface Reduction
>Control Description
>Cross-Framework Mappings
>Supplemental Guidance
Attack surface reduction is closely aligned with threat and vulnerability analyses and system architecture and design. Attack surface reduction is a means of reducing risk to organizations by giving attackers less opportunity to exploit weaknesses or deficiencies (i.e., potential vulnerabilities) within systems, system components, and system services. Attack surface reduction includes implementing the concept of layered defenses, applying the principles of least privilege and least functionality, applying secure software development practices, deprecating unsafe functions, reducing entry points available to unauthorized users, reducing the amount of code that executes, and eliminating application programming interfaces (APIs) that are vulnerable to attacks.
>Related Controls
>Assessment Interview Topics
Questions assessors commonly ask
Process & Governance:
- •What acquisition policies and procedures address the requirements of SA-15(5)?
- •How are security and privacy requirements integrated into the acquisition process?
- •Who is responsible for ensuring that acquisitions comply with SA-15(5)?
- •How is security integrated throughout your system development lifecycle (SDLC)?
Technical Implementation:
- •How are security requirements defined and documented in acquisition contracts?
- •What mechanisms ensure that acquired systems and services meet security requirements?
- •How do you validate that vendors and service providers comply with specified security controls?
- •What security practices are required at each phase of the SDLC?
- •What secure coding practices and standards are required for developers?
Evidence & Documentation:
- •Can you provide examples of acquisition documentation that includes security requirements?
- •What evidence demonstrates that acquired systems meet security specifications?
- •Where is acquisition security documentation maintained throughout the system lifecycle?
- •Can you show evidence of security activities performed during development?
- •Can you provide code review or static analysis results?
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