Splunk Enterprise Security
by Cisco
Covered
15
controls
Partial
3
controls
Gaps
3
controls
Overview
Splunk Enterprise Security by Splunk is a siem & logging solution that covers 15 NIST 800-171 controls (14% total coverage). It addresses key requirements in the siem & logging domain for defense contractors pursuing CMMC compliance.
Controls Covered (15)
Implementation Notes
Deploy Splunk Enterprise Security with FIPS-validated configurations. Integrate with your SIEM for centralized audit logging. Review partial controls quarterly to identify supplementary tooling needs.
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Implementation Guidance for Splunk Enterprise Security
Configure Splunk Enterprise Security for NIST 800-171 compliance by implementing comprehensive logging across the AC (Access Control), AU (Audit), and IR (Incident Response) control families. For AC controls, configure user activity monitoring dashboards and correlation searches to detect unauthorized access attempts. Enable the Identity Investigation dashboard and configure authentication data models to track logon patterns and privilege escalations. For AU controls, implement the Security Posture dashboard with asset and identity correlation, ensuring log retention meets the 90-day minimum requirement through index configuration in indexes.conf. Configure notable event rules and threat intelligence frameworks to satisfy AU-6 requirements for audit review and analysis. For IR controls, deploy the Incident Review dashboard and configure adaptive response actions for automated incident handling workflows. Integrate with enterprise authentication systems via LDAP/SAML and configure the Splunk DB Connect app for pulling user account data. Generate assessment evidence through scheduled PDF reports of security dashboards, correlation search results, and incident investigation timelines. Integration with endpoint detection tools like CrowdStrike or SentinelOne provides comprehensive visibility across the security stack. Common misconfigurations include insufficient data source coverage, improper index retention policies, inadequate correlation search tuning leading to alert fatigue, and failure to configure proper role-based access controls for SOC analysts versus administrators.
Gap Analysis & Compensating Controls
Splunk Enterprise Security does not natively cover CM (Configuration Management), IA (Identification and Authentication), and SC (System and Communications Protection) controls, representing critical compliance gaps. The CM control family gap is significant as it includes baseline configuration management and vulnerability scanning requirements - compensate with tools like Nessus Tenable or Rapid7 for vulnerability management and configuration compliance scanning. Document in your SSP that Splunk provides audit trails for configuration changes but requires integration with SCCM or Ansible for actual configuration enforcement. For IA controls, while Splunk can monitor authentication events, it cannot enforce multi-factor authentication or password policies - integrate with enterprise identity providers like Active Directory or Okta. The SC control family requires network security controls like firewalls and intrusion prevention systems - compensate with Palo Alto Networks or Fortinet solutions. In your POA&M, prioritize closing the IA gaps first as these carry the highest CMMC assessment weight, followed by SC controls for network protection, then CM controls for configuration management. Document these compensating controls clearly in your SSP with explicit integration points showing how Splunk provides visibility into the security posture maintained by these additional tools.
Compliance Cost Estimate
Splunk Enterprise Security licensing ranges from $150-$300 per GB/day ingested, typically translating to $15,000-$50,000 annually for mid-sized defense contractors processing 50-200GB daily. Implementation costs include professional services ($20,000-$40,000) for initial configuration, correlation rule development, and dashboard customization. Ongoing costs include dedicated SOC analyst time ($80,000-$120,000 annually) and quarterly tuning engagements ($5,000-$10,000). Compared to competitors like IBM QRadar ($100,000-$200,000 total cost) or Microsoft Sentinel ($50-$200/GB), Splunk offers superior search capabilities and customization but at a premium price point. Factor in training costs ($3,000-$5,000 per analyst) and infrastructure requirements for high-availability deployments.
Compliance Cross-References
Splunk Enterprise Security directly satisfies DFARS 252.204-7012 requirements for security incident reporting and forensic analysis capabilities through its incident investigation workflows and timeline reconstruction features. For CMMC Level 2, it covers Assessment Objectives in AU.L2-3.3.1 (audit record creation), AU.L2-3.3.2 (audit record content), IR.L2-3.6.1 (incident handling), and IR.L2-3.6.2 (incident monitoring). The platform's correlation searches and threat intelligence integration support SI.L2-3.14.2 for malicious code protection through behavioral analysis. FedRAMP Moderate controls AU-2, AU-3, AU-6, IR-4, and IR-5 are satisfied through Splunk's native logging, correlation, and incident response capabilities. However, additional tools are required for AC-2 (account management), IA-2 (user identification and authentication), and SC-7 (boundary protection) to achieve full CMMC Level 2 compliance. Document in your CMMC assessment how Splunk's API integration enables automated compliance reporting and evidence collection for continuous monitoring requirements.
Frequently Asked Questions
How many NIST 800-171 controls does Splunk Enterprise Security cover?
Splunk Enterprise Security covers 15 of 110 NIST 800-171 controls (14%), with 3 partially covered and 3 gaps.
Can Splunk Enterprise Security alone satisfy CMMC Level 2?
No single tool covers all 110 NIST 800-171 controls. Splunk Enterprise Security covers 14% and should be part of a layered security stack addressing the remaining controls.
What controls does Splunk Enterprise Security not cover?
Splunk Enterprise Security does not cover controls mp-3-8-1, ia-3-5-1, pe-3-10-1. These require supplementary solutions such as physical security controls, additional access management, or media protection tools.
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