CMMC IA.L1-3.5.1 User Identification: Complete Compliance Guide
User identification is the foundation of access control in CMMC Level 1. This control requires you to uniquely identify every user, process, and device accessing your information systems. Without proper identification mechanisms, you cannot track who accessed what—a critical gap in any compliance audit.
What this means
IA.L1-3.5.1 mandates that your organization implement a system to uniquely identify information system users, automated processes acting on behalf of users, and devices connecting to your network. This means assigning unique identifiers (usernames, service accounts, device IDs) to all entities attempting system access, enabling you to log, monitor, and audit activity tied to specific users or devices rather than generic 'shared' accounts.
How to comply
- 1.Establish a unique user account naming convention and issue individual accounts to each user based on their role and access needs
- 2.Document all system users in an access inventory, including their names, roles, and assigned system access rights
- 3.Implement automated process and service account identification through dedicated service accounts rather than shared credentials
- 4.Configure device identification mechanisms (hostname, MAC address, asset tags) for all computers, servers, and network devices
- 5.Maintain an updated inventory of all devices accessing your systems, including employee and contractor equipment
- 6.Implement logging and monitoring to track actions performed by each identified user and device
- 7.Review and validate user and device identities quarterly to ensure accuracy and remove terminated users
Evidence auditors look for
- Active Directory or similar user account management system showing individual user accounts with unique identifiers
- System access logs demonstrating user login records tied to individual accounts, not shared credentials
- Service account inventory documenting automated process identifiers separate from human user accounts
- Device inventory listing all systems accessing the network with unique device identifiers
- Access control lists (ACLs) showing permissions assigned by individual user or device identity
- User access reviews conducted quarterly with documented evidence of identity verification
- Configuration screenshots showing audit logging enabled and tracking user/device-level activity
- Asset management records correlating device identities to physical or virtual assets
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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