IA.L1-3.5.2: User Authentication in CMMC Level 1
User authentication is a foundational security control that verifies the identity of anyone—or anything—requesting access to your systems. Under CMMC Level 1, you must establish and enforce authentication before granting access to organizational information. This control prevents unauthorized users and compromised devices from infiltrating your network.
What this means
This control requires you to authenticate (verify the identity of) users, processes, and devices before they can access your organizational information systems. Authentication confirms that a person is who they claim to be, a software process is legitimate, or a device is authorized—serving as a prerequisite gate to all system access. It's not about permissions or what they can do; it's about confirming their identity first.
How to comply
- 1.Implement authentication mechanisms (passwords, multifactor authentication, certificates) for all user accounts accessing organizational systems
- 2.Require strong password policies (minimum length, complexity, expiration) and enforce them across all systems
- 3.Enable multifactor authentication (MFA) for sensitive systems or remote access where feasible
- 4.Apply authentication controls to service accounts and automated processes, not just human users
- 5.Verify device identities before allowing them to connect to network resources
- 6.Document and maintain records of all authentication methods in use across your environment
- 7.Test authentication mechanisms regularly to ensure they function as intended
- 8.Train employees on authentication best practices and the importance of protecting credentials
Evidence auditors look for
- Password policy documentation showing minimum length, complexity, and expiration requirements
- Active Directory or identity management system logs showing authentication enforcement
- Multifactor authentication configurations for critical systems or VPN access
- Device enrollment and certificate management records
- Screenshots of login prompts requiring credentials before system access
- Service account documentation with authentication method details
- Network access control (NAC) logs showing device authentication
- System audit logs demonstrating authentication events and failed login attempts
Frequently asked questions
When will FAQs be available?
The FAQ for this control is currently being prepared.
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