What must each entity ensure regarding processes and access to cardholder data environment under A.1.1?

What must each entity ensure regarding processes and access to cardholder data environment under A.1.1?

• A. Each entity runs all processes with access to the entire cardholder data environment.
• B. Each entity only runs processes that have access to that entity's cardholder data environment.
• C. All processes must be isolated from cardholder data completely.
• D. Processes may access data as needed without restrictions.

Answer: (B)

Access control and data segmentation within the cardholder data environment mean: each entity should run only those processes that have access to that entity’s own cardholder data environment. This follows the principle of least privilege and need-to-know, keeping each entity’s data isolated so that a process can access only what it absolutely needs. This is why the correct approach is to have each entity run processes that access only its own cardholder data environment. It minimizes exposure, limits the blast radius if a breach occurs, and makes it easier to manage and demonstrate proper separation between different data environments. It also helps reduce PCI DSS scope by clarifying which data and processes belong to which entity. Why the other options don’t fit: allowing a process to access the entire cardholder data environment increases risk because a compromise could affect all data. Requiring all processes to be completely isolated from cardholder data is impractical because legitimate processing often needs access to specific data within a controlled environment. Allowing unrestricted data access without restrictions directly contradicts the principle of least privilege and how access should be managed under PCI DSS.

Access control and data segmentation within the cardholder data environment mean: each entity should run only those processes that have access to that entity’s own cardholder data environment. This follows the principle of least privilege and need-to-know, keeping each entity’s data isolated so that a process can access only what it absolutely needs.

This is why the correct approach is to have each entity run processes that access only its own cardholder data environment. It minimizes exposure, limits the blast radius if a breach occurs, and makes it easier to manage and demonstrate proper separation between different data environments. It also helps reduce PCI DSS scope by clarifying which data and processes belong to which entity.

Why the other options don’t fit: allowing a process to access the entire cardholder data environment increases risk because a compromise could affect all data. Requiring all processes to be completely isolated from cardholder data is impractical because legitimate processing often needs access to specific data within a controlled environment. Allowing unrestricted data access without restrictions directly contradicts the principle of least privilege and how access should be managed under PCI DSS.