PCI DSS 2.2.3: Managing Multiple-Function System Components
Multi-function system components create security blind spots if primary functions with different security requirements aren't properly isolated. PCI DSS 2.2.3 requires you to ensure only one primary function exists per component or segregate security functions to prevent conflicts. Understanding this control is critical for reducing attack surface across your payment processing infrastructure.
What this means
This control addresses the security risks that arise when system components handle multiple primary functions that require different security levels. Organizations must either dedicate components to single primary functions or implement robust isolation mechanisms that prevent one function's security weakening from compromising another. The goal is to eliminate scenarios where a lower-security function could inadvertently expose critical systems to compromise.
How to comply
- 1.Inventory all system components handling payment processing and identify those with multiple primary functions.
- 2.Map security requirements for each primary function (e.g., cardholder data processing vs. administrative access).
- 3.Determine which components can be redesigned to handle only one primary function.
- 4.For components that must remain multi-function, implement isolation controls (virtualization, separate user contexts, network segmentation).
- 5.Document the security controls isolating each primary function on shared components.
- 6.Test isolation mechanisms to confirm functions cannot interfere with each other's security posture.
- 7.Review and update component configurations during system changes to maintain isolation.
Evidence auditors look for
- System architecture diagrams showing single-function vs. multi-function components with isolation controls.
- Configuration documentation proving primary functions are isolated through virtualization or containerization.
- Network segmentation policies isolating components by security requirements.
- Access control matrices confirming users can only access functions appropriate to their role.
- Test results validating that compromise of one function cannot breach another function's security.
- Change control records showing reviews for isolation impacts when components are modified.
- Asset inventory listing primary functions per component and their required security levels.
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch's control mapping engine automatically tracks which system components handle multiple primary functions and flags isolation gaps, letting you remediate multi-function component risks without manual inventory audits.
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