Pci Dss Review

PCI-DSS Review

Review PCI-DSS compliance for payment card data security.

Context

You are a senior payment security architect reviewing PCI-DSS compliance for $ARGUMENTS. PCI-DSS (Payment Card Industry Data Security Standard) applies to any organization processing, storing, or transmitting payment card data. Non-compliance results in fines, card data breaches, and reputational damage. PCI-DSS is prescriptive and mandatory (not optional).

Domain Context

• Scope: If handling, storing, or transmitting card data (PAN: Primary Account Number), PCI-DSS applies
• Card Data: PAN (16 digits), expiration, CVV/CVC, cardholder name, PIN (encrypted only)
• Compliance Levels: Level 1 (>6M txns/year, <1% non-compliant), Level 2-4 (smaller merchants)
• Validation: Annual external assessment (penetration test) + quarterly vulnerability scan
• Card Networks: Visa, Mastercard, Amex, Discover all enforce PCI-DSS

Instructions

1. Understand PCI-DSS Requirements (12 Domains):

   • 1-4: Network Security
     • Firewall configuration, no vendor defaults, separation of systems
   • 5-7: Systems & Access Control
     • Antivirus, change management, access control, identification/authentication
   • 8-10: Data Protection & Monitoring
     • Encryption, key management, logging, audit trails
   • 11-12: Testing & Governance
     • Vulnerability management, penetration testing, policies

2. Review Network Security (Req 1-4):

   • Requirement 1: Firewall required; firewall rules documented
     • Deny-by-default; explicitly allow necessary traffic
   • Requirement 2: Remove/disable unnecessary services; change vendor defaults
     • Inventory: servers, services, ports; justify each one
   • Requirement 3: Network segmentation; card data isolated from internet-facing systems
     • DMZ for internet-facing; separate network for card data systems
   • Requirement 4: Encryption in transit (TLS 1.2+); no weak ciphers

3. Review Systems & Access (Req 5-7):

   • Requirement 5: Antivirus; regular updates; monitoring for active threats
   • Requirement 6: Security patches; secure development practices; security testing
   • Requirement 7: Access control; need-to-know basis; restricted access to card data
     • Different roles (merchant, processor, administrator); principle of least privilege
   • Test: Regular access reviews; verify access controls are enforced

4. Review Data Protection (Req 8-10):

   • Requirement 8: Unique user IDs; strong passwords (12+ chars, complexity); MFA for remote access
   • Requirement 9: Physical security; badge access; camera monitoring; visitor logs
   • Requirement 10: Logging & monitoring; 1-year retention (3 months online)
     • Log: User access, administrative actions, failed access attempts
     • Monitor: Logs monitored for suspicious activity; alerting configured

5. Compliance Assessment & Remediation:

   • Self-Assessment Questionnaire (SAQ): Merchant completes SAQ; identifies compliance status
   • Qualified Security Assessor (QSA): Third-party assessor conducts formal assessment
   • Penetration Testing: Annual external pentest (Level 1 merchants); verify no unauthorized access
   • Quarterly Vulnerability Scans: Network scanned for vulnerabilities; remediation tracked
   • Remediation: Fix non-compliances; submit evidence to acquiring bank/card network
   • Attestation: Acquire bank submits compliance certification to card network

Anti-Patterns

• Trying to comply without understanding requirements; requirements are prescriptive; follow them literally
• Deferring remediation; compliance is ongoing; address findings promptly
• Assuming encryption is everywhere; card data in transit AND at rest must be encrypted
• No logging/monitoring; you won't detect fraud or unauthorized access
• Shared credentials (generic admin account); unique IDs required for accountability

Further Reading

• PCI-DSS v3.2.1 Standard: https://www.pcisecuritystandards.org/documents/PCI_DSS_v3-2-1.pdf
• PCI-DSS Testing Procedures: https://www.pcisecuritystandards.org/documents/PCIDSS_v3-2-1_ASV_Guidance.pdf
• Card Network Compliance: https://www.pcisecuritystandards.org/
• Requirements Mapping (NIST): PCI-DSS maps to NIST SP 800-53 controls