NIST 800-171 Control 3.3.1: System Audit Logging
System audit logging is your organization's digital witness—capturing every access, change, and suspicious activity across your IT infrastructure. NIST SP 800-171 Control 3.3.1 requires you to create and retain audit logs sufficient to detect, investigate, and report unauthorized system activity. Without proper logging, you're operating blind to compliance violations and security threats.
What this means
Control 3.3.1 mandates that you establish comprehensive audit logging across all systems handling controlled unclassified information (CUI). This means recording system events—logins, file access, configuration changes, and security events—with sufficient detail and retention to support monitoring, forensic analysis, and incident reporting. The logs must capture enough information to reconstruct events and identify who did what, when, and from where.
How to comply
- 1.Configure audit logging on all systems and network devices that process, transmit, or store CUI
- 2.Define audit log parameters including event types, data fields, and timestamps for each system
- 3.Establish centralized log collection to aggregate logs from all sources into a single repository
- 4.Implement log retention policies based on organizational needs and regulatory requirements (typically 1-3 years minimum)
- 5.Regularly review and analyze logs for suspicious patterns, failed access attempts, and unauthorized activities
- 6.Protect log integrity through access controls, encryption, and write-once storage where feasible
- 7.Document your audit logging policy, including scope, retention periods, and review procedures
Evidence auditors look for
- System audit logging configuration documentation showing enabled events across all applicable systems
- Log retention policy specifying minimum retention periods aligned with compliance requirements
- Centralized log management solution deployment (SIEM) with evidence of active log collection
- Sample audit logs showing timestamps, user identifiers, event types, and outcomes
- Log review procedures and evidence of periodic analysis for unauthorized activity
- Access control policies restricting who can view, modify, or delete audit logs
- Backup and archival procedures protecting log integrity and availability
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch automates audit log collection from all your systems, centralizes them in a compliant repository, and generates NIST 800-171 audit trail evidence—eliminating manual log management and proving 3.3.1 compliance in minutes, not weeks.
See how GRCWatch handles this control automatically
Start free trial