CUI Compliant
0 NIST 800-171 gaps detected. FedRAMP Moderate authorized. Industry-leading SIEM for audit logging and security monitoring. Essential for NIST 800-171 3.3.x audit controls.
Splunk Cloud for Government
by Cisco
FedRAMP Status
FedRAMP Authorized
Impact Level
Moderate
Category
Cybersecurity
Authorized: August 20, 2019
Overview
Splunk Cloud for Government is the FedRAMP Moderate authorized version of the industry-leading SIEM platform. It provides log aggregation, security monitoring, threat detection, and compliance reporting required by NIST 800-171 audit and accountability controls (3.3.x family).
CUI Risk Assessment
FedRAMP Moderate authorized. Industry-leading SIEM for audit logging and security monitoring. Essential for NIST 800-171 3.3.x audit controls.
Using Splunk Cloud for Government in a Defense Contractor Environment
Splunk Cloud for Government serves as the centralized log aggregation and SIEM platform for defense contractors handling CUI across multiple categories including technical data packages (TDP), financial performance reports, supply chain information, and personally identifiable information from security clearance processes. Within a CMMC Level 2 authorization boundary, Splunk Cloud for Government operates as a boundary-spanning service that ingests logs from all CUI-processing systems, network devices, and security tools, making it a critical component for audit and accountability controls. The platform's FedRAMP Moderate authorization provides inherent compensating controls including encryption in transit/at rest, multi-factor authentication, and incident response capabilities. However, contractors must implement additional controls including proper log retention policies aligned with NIST 800-171 AU-11, secure log transmission using TLS 1.2+, and role-based access controls limiting analyst access to CUI-derived logs. DCMA and DIBCAC assessors typically evaluate Splunk Cloud for Government deployments by examining log ingestion architecture, data retention configurations, user access controls, and integration with contractor's incident response procedures. Recent DCMA reviews have specifically scrutinized contractors' log forwarding configurations to ensure CUI-derived security events are properly captured and retained. The platform has generally received positive assessment outcomes when properly configured with appropriate data classification and access controls, though assessors have flagged insufficient log retention periods and overly permissive user access as common findings.
Deployment & Architecture
Deployment Model: Government Cloud (FedRAMP boundary)
Splunk Cloud for Government operates within a FedRAMP-authorized boundary. CUI can be processed within the authorization scope, but contractors must verify their specific use case falls within the system's security boundary as documented in the SSP.
Implementation Guide
For defense contractors implementing Splunk Cloud for Government for CUI environments, the deployment timeline spans 12-16 weeks across four phases: planning/design (3 weeks), infrastructure setup (4 weeks), data migration (6 weeks), and compliance validation (3 weeks). Initial implementation requires establishing secure log forwarding infrastructure using universal forwarders with TLS encryption, configuring data inputs for all CUI-processing systems, and establishing proper index segregation to separate CUI-derived logs from general IT logs. Data migration involves configuring log retention policies to meet NIST 800-171 AU-11 requirements (minimum 1 year for audit records), implementing role-based access controls limiting analyst access to CUI-derived security events, and establishing automated alerting for security incidents involving CUI data. User training requirements include 16 hours of platform-specific training for security analysts and 8 hours for system administrators, focusing on CUI handling procedures and incident response workflows. Compliance documentation updates must include SSP modifications to reflect Splunk Cloud for Government as an interconnected system, authorization boundary diagram updates showing log flow architecture, and POA&M entries for any temporary security measures during implementation. Implementation costs range from $150,000-$300,000 including platform licensing, professional services for initial configuration, staff training, and compliance documentation updates. No migration away from the platform is necessary given its FedRAMP authorization and strong compliance posture for CUI environments.
Configuration Checklist
- 1ISSO shall update the System Security Plan to include Splunk Cloud for Government as an interconnected system within the CUI authorization boundary per NIST 800-171 CA-3.
- 2System administrator must configure universal forwarders on all CUI-processing systems with TLS 1.2 encryption for secure log transmission to meet SC-8 requirements.
- 3ISSO shall establish index-level data segregation policies separating CUI-derived logs from general IT logs to support proper access control per AC-3.
- 4System administrator must configure audit log retention for minimum 1 year to satisfy NIST 800-171 AU-11 requirements for audit record retention.
- 5ISSO shall implement role-based access controls limiting security analyst access only to authorized CUI categories per their clearance level and need-to-know.
- 6System administrator must configure automated alerting rules for security events involving CUI data exfiltration, unauthorized access, or system modifications per IR-5.
- 7ISSO shall update authorization boundary diagrams to accurately reflect log flow architecture and network connections per NIST 800-171 CA-3.
- 8Contracts officer must verify Splunk Cloud for Government licensing terms include appropriate data sovereignty and government access provisions per DFARS 252.204-7012.
- 9System administrator must establish backup and recovery procedures for critical security logs stored in Splunk Cloud for Government per CP-9 requirements.
- 10ISSO shall conduct monthly compliance reviews of user access logs and data retention policies to ensure continued adherence to CUI handling requirements.
Compliance Cross-References
Splunk Cloud for Government's FedRAMP Moderate authorization directly supports NIST 800-171 Audit and Accountability (AU) control family requirements, particularly AU-2 (auditable events), AU-3 (audit record content), AU-6 (audit review), AU-11 (audit record retention), and AU-12 (audit generation). The platform's centralized logging capabilities enable compliance with System and Communications Protection (SC) controls including SC-7 (boundary protection) through log correlation and SC-8 (transmission confidentiality) via encrypted log forwarding. For Access Control (AC) family requirements, the platform supports AC-2 (account management) and AC-3 (access enforcement) through detailed user activity logging and role-based access controls. Under DFARS 252.204-7012, contractors must ensure adequate security for CUI, and Splunk Cloud for Government provides essential security monitoring capabilities to detect and respond to CUI-related incidents. The platform directly supports CMMC Level 2 assessment domains including Access Control (AC.L2), Audit and Accountability (AU.L2), and System and Information Integrity (SI.L2) through comprehensive security event logging and correlation. FedRAMP Moderate authorization ensures the platform meets security control baselines required for CUI processing environments, eliminating the need for additional security assessments when properly integrated into contractor authorization boundaries.
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Frequently Asked Questions
Do I need a SIEM for CMMC compliance?
NIST 800-171 requires audit log collection, review, and alerting (3.3.x controls). A SIEM like Splunk Government is the standard way to meet these requirements at scale.
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