NIST 800-171 Control 3.1.4: Separation of Duties
Separation of duties is a foundational control that prevents single individuals from having excessive system access—reducing the risk of fraud, error, and malicious activity. For SMBs handling controlled unclassified information (CUI), implementing this control means structuring roles and access permissions so no one person can perform critical actions alone. This control is essential for earning and maintaining NIST 800-171 compliance.
What this means
Separation of duties requires your organization to divide system responsibilities and access rights among multiple people so that no single individual can circumvent security controls or execute sensitive transactions without oversight. This principle prevents both accidental mistakes and deliberate malicious activity that would require collusion between two or more people to succeed. Common examples include ensuring the person who requests a data export differs from the person who approves it, or that system administrators cannot create user accounts and assign themselves elevated privileges simultaneously.
How to comply
- 1.Map all critical business and system functions (user provisioning, data access, financial transactions, system configuration changes)
- 2.Define role-based access control (RBAC) policies that assign only necessary permissions to each role
- 3.Segregate conflicting duties so that authorization, approval, execution, and audit functions rest with different people
- 4.Document your segregation policy, listing which roles cannot be combined for single individuals
- 5.Implement technical controls (access management tools, workflow approvals) to enforce segregation automatically
- 6.Regularly audit user access and role assignments to verify no one person holds conflicting duties
- 7.Update role assignments whenever employees change positions or leave the organization
Evidence auditors look for
- Role-based access control (RBAC) configuration documentation showing separation between administrative, approval, and execution roles
- Access control matrix mapping users to system functions and confirming no conflicting duties are assigned
- User provisioning workflow screenshots showing multi-step approval chains
- Privileged access management (PAM) logs demonstrating approval requirements before sensitive actions
- Quarterly access review reports signed by managers confirming appropriateness of user-role assignments
- System configuration preventing simultaneous role assignment (e.g., user cannot be both requester and approver)
- Incident logs showing rejected or flagged transactions when duty segregation would be violated
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
GRCWatch automates separation of duties enforcement by tracking user-role assignments, flagging conflicting permissions in real time, and generating quarterly compliance reports—eliminating manual access reviews and reducing the overhead of NIST 800-171 audits.
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