PCI DSS 11.5.1: Deploy Intrusion Detection and Prevention Systems
Intrusion detection and prevention systems (IDPS) are critical controls that monitor your network for suspicious activity and block threats before they cause damage. For payment card environments, PCI DSS 11.5.1 mandates these capabilities to detect and stop network intrusions. This guide shows SMBs how to implement and maintain effective IDPS controls.
What this means
PCI DSS 11.5.1 requires you to deploy technology that actively monitors network traffic for signs of intrusion attempts and malicious activity. This includes both detection (identifying threats) and prevention (blocking or stopping threats). The goal is to protect cardholder data environments from unauthorized access and network-based attacks by catching threats in real-time rather than after damage occurs.
How to comply
- 1.Select and deploy intrusion detection and/or intrusion prevention tools appropriate for your network architecture and traffic volume.
- 2.Configure IDPS to monitor all network traffic entering and exiting your cardholder data environment.
- 3.Define baseline traffic patterns and establish alerts for anomalies that may indicate intrusion attempts.
- 4.Regularly review and tune IDPS signatures and rules to reduce false positives while maintaining threat detection.
- 5.Log all intrusion detection and prevention events with timestamps for audit trails and forensic analysis.
- 6.Establish procedures for incident response when intrusion attempts are detected.
- 7.Conduct quarterly reviews of IDPS effectiveness and adjust configurations based on emerging threats.
Evidence auditors look for
- IDPS software or appliance deployment documentation with configuration details
- Network diagrams showing IDPS placement and monitoring scope
- IDPS rule sets, signatures, and tuning logs from the past 12 months
- Sample IDPS event logs showing detected intrusion attempts and prevention actions
- Incident response records triggered by IDPS alerts
- Maintenance and signature update logs demonstrating ongoing system management
- Network traffic baseline reports and anomaly detection thresholds
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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