Audit and Accountability 3.3.2 (3.3.2)
Ensure that the actions of individual system users can be uniquely traced to those users, so they can be held accountable for their actions.
Get Full GuidanceWhat Is This CMMC Control?
This control requires organizations to ensure that audit logs contain enough information to identify which specific user performed each action. The goal is accountability - being able to trace system activities back to individual users so they can be held responsible for their actions. This means audit records must include user identifiers, timestamps, and sufficient detail to reconstruct who did what and when.
Control Intent
Enable accountability by ensuring audit records contain sufficient information to uniquely identify the individual user responsible for each auditable action, supporting investigation, deterrence, and enforcement of security policies.
Who This Control Applies To
- •All systems that process, store, or transmit CUI
- •All user accounts with access to CUI or systems containing CUI
- •All applications, databases, and infrastructure components where user actions are performed
- •Remote access systems and VPN connections
- •Privileged accounts and administrative access
- •Shared systems where multiple users may access the same resources
- •Cloud services and SaaS applications handling CUI
Not Applicable When
- •Systems that have no user interaction or are fully automated with no human access
- •Systems that only process public information and never handle CUI
- •Standalone systems with a single dedicated user and no network connectivity
- •Systems in environments where all users share a single generic account and individual traceability is technically impossible (this scenario typically indicates a control failure rather than legitimate non-applicability)
Key Objectives
- 1Audit records must contain information that uniquely identifies the individual user who performed each auditable action.
- 2The level of detail in audit records must be sufficient to trace actions back to specific users with reasonable certainty.
- 3Audit mechanisms must capture user identity information in a way that supports accountability and investigation of security incidents.
Sample Self-Assessment Questions (Partial)
Does your organization use unique user accounts for each person who accesses systems containing CUI?
Do your audit logs include the username or user ID for each action that is logged?
Implementation Approaches (High-Level)
Unique User Accounts with Username Logging
Each individual is assigned a unique user account, and all systems log the username or user ID for every auditable action. This is the most common and straightforward implementation.
Privileged Access Management with Session Recording
For privileged or administrative access, use a PAM solution that requires individual authentication before granting access to shared privileged accounts, and logs which individual used each privileged session.
Federated Identity with Centralized Audit Logging
Use SSO or federated identity systems to authenticate users, and ensure that the federated user identity is passed through to applications and logged in audit records.
Multi-Tier Application User Context Propagation
In multi-tier applications, ensure that the end user's identity is propagated through all application tiers and logged at each tier, not just the application service account.
Network Device and Security Appliance Individual Accounts
Configure network devices, firewalls, and security appliances to require individual user accounts for administrative access, and log all administrative actions with the individual user's identity.
Evidence & Assessment Notes
Expected Evidence
Organizations should maintain documentation and evidence demonstrating compliance with this control. This may include policy documentation, configuration records, audit logs, access reviews, and other relevant artifacts that show how the control is implemented and maintained.
Plan of Action & Milestones (POA&M)
If shared accounts are currently in use, develop a plan to migrate to unique user accounts with specific milestones and completion dates If audit logs do not currently include user identity, prioritize systems based on risk and CUI exposure, and develop a phased implementation plan For legacy systems that cannot log user identity, document compensating controls such as physical access restrictions, network segmentation, or enhanced monitoring If privileged access currently uses shared accounts, implement a PAM solution or other mechanism to trace privileged actions to individuals For multi-tier applications that currently log only service accounts, develop a plan to implement user context propagation with specific technical milestones If federated identity systems do not currently pass user identity to applications, work with application vendors or developers to implement proper identity propagation Document any technical limitations that prevent user traceability and the risk acceptance or mitigation strategy for those limitations Include specific technical tasks, responsible parties, and completion dates for each remediation activity Plan for testing and validation of user traceability after implementation changes Consider interim monitoring or manual processes to enhance user accountability while technical solutions are being implemented
Frequently Asked Questions
What if we use shared accounts for certain systems - does that automatically fail this control?
Using shared accounts makes it very difficult to meet this control because you cannot uniquely trace actions to individuals. However, if you have a compensating control such as a PAM system that logs which individual accessed the shared account and records session activity, you may still be able to demonstrate traceability. The key is proving that you can identify which specific person performed each action, even if the target system sees a shared account.
Do service accounts and automated processes need to be traced to individuals?
Service accounts and automated processes should be clearly distinguished from individual user actions in audit logs. While the service account itself doesn't need to be traced to an individual, any human who configures, starts, or modifies the automated process should be traceable. The audit logs should make it clear which actions were performed by automated processes versus individual users.
How detailed do audit logs need to be to satisfy this control?
Audit logs must contain enough information to identify which specific user performed each action. At minimum, this typically includes the username or user ID, timestamp, and description of the action. The level of detail should be sufficient that during an incident investigation, you can definitively say 'User X performed action Y at time Z.' If you cannot make that determination from your logs, they are likely insufficient.
What happens if our legacy systems cannot log individual user identity?
Legacy systems that cannot log user identity present a compliance challenge. You should document this limitation, assess the risk, and implement compensating controls such as restricting access to the legacy system, enhanced physical security, network segmentation, or additional monitoring. You may need to develop a POA&M to either upgrade the system, replace it, or implement technical controls that add user traceability (such as a PAM system or jump server that logs user identity).
How does this control apply to cloud services and SaaS applications?
Cloud services and SaaS applications must log which specific user in your organization performed each action. This typically means configuring SSO or federated identity so that your users authenticate with their unique organizational credentials, and ensuring that the cloud service logs those user identities in its audit logs. You should verify that the cloud provider's audit logs include your users' identities, not just generic tenant identifiers or API keys.
Can we use IP addresses or device identifiers instead of usernames for traceability?
No, IP addresses and device identifiers alone are not sufficient because multiple users may share the same IP address or device. User traceability requires logging the actual user identity (username, user ID, or other unique identifier) that can be definitively linked to a specific individual. IP addresses and device identifiers can supplement user identity information but cannot replace it.
How ConformatIQ Helps With CMMC Readiness
ConformatIQ is an AI-assisted CMMC readiness platform designed to help organizations prepare for assessments more efficiently. The platform supports document generation such as SSPs and POA&Ms, guided readiness workflows, centralized evidence tracking, and interview preparation for assessments.
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Request Full GuidanceInformation sourced from NIST SP 800-171 Rev. 2. See full disclaimer.