1Overview
AU.L2-3.3.9 closes the Audit and Accountability family by restricting who can manage the logging. It requires that management of audit logging functionality be limited to a subset of privileged users, so that the ability to change, disable, or clear the audit machinery rests with a small, trusted few rather than every administrator. It is a one-point requirement and may be deferred on a plan of action.
Protecting the audit trail means protecting the controls over it. If every administrator can reconfigure or disable logging, then any compromised administrator account can silence the audit trail, and the protection of 3.3.8 is undermined from the inside. This control narrows that power: only a defined subset of privileged users may manage audit logging, which limits the number of accounts whose compromise could turn off the recording and separates ordinary administration from control over the audit machinery. It is the natural companion to protecting the records themselves.
Limit management of audit logging functionality to a subset of privileged users.
The phrase "a subset of privileged users" is deliberate. Not every administrator needs the ability to manage logging, and giving it to all of them widens the group whose compromise could disable auditing. The control asks the organization to define a smaller set of privileged users who may manage the logging, and to limit that management to them, so that control over the audit trail is held narrowly. It reduces both the insider risk and the attack surface around the auditing itself.
2The Assessment Objectives
NIST SP 800-171A frames 3.3.9 around two objectives: define the subset, and limit management to it.
A subset of privileged users granted access to manage audit logging functionality is defined. The organization has decided which privileged users may manage logging.
Management of audit logging functionality is limited to the defined subset of privileged users. Only that subset can actually manage the logging.
The two objectives are defining the subset and enforcing the limit. The common gap is at objective [b], where a subset is named but nothing technically prevents other administrators from managing the logging. The assessor looks for enforcement that actually confines audit management to the defined few.
3Failure Patterns
The failures are about audit management spread across every administrator and limits that exist only on paper.
Every administrator can manage logging
Where all administrators can change or disable logging, any one compromised administrator account can silence the audit trail. Narrowing audit management to a subset reduces the number of accounts whose compromise carries that power.
A subset named but not enforced
Defining a subset without technically restricting management to it leaves objective [b] unmet, because the limit is only a statement. Enforcement through permissions is what makes the subset real.
No separation from general administration
When audit management is bundled with general administrative rights, it cannot be limited to a subset, since anyone with admin rights holds it. Separating audit management as a distinct permission is what allows the restriction.
The subset that is not actually smaller
A subset that includes every privileged user is not a subset in substance, and does not reduce the risk the control targets. The defined group has to be genuinely narrower than the full set of administrators.
4Ownership
This is an IT-owned technical control, closely tied to how privileged access is structured.
| Role | Responsibility for this control |
|---|---|
| IT and system administrator | Defines the subset permitted to manage logging and enforces the restriction through permissions. Owns the technical evidence. |
| Security or compliance lead | Confirms the subset is genuinely narrower than general administration and that the limit is enforced. |
| Program lead | Reviews the subset periodically as staff change and retains the evidence. |
5Tooling
The control is delivered by permissions that separate audit management from general administration and confine it to the defined subset.
| Objectives | Tooling | What it provides |
|---|---|---|
| [a] | Defined audit management role or group | The named subset of privileged users permitted to manage logging. |
| [b] enforcement | Role-based permissions, restricted audit privileges | Technical restriction of logging management to the defined subset. |
| Separation | Separate audit management from general admin rights | Audit management held as a distinct permission rather than bundled with all administration. |
The caveat is that the subset has to be both genuinely smaller and technically enforced. A named group that still includes every administrator, or a limit that permissions do not enforce, does not meet the control. The assessor examines who can actually manage the logging, so the enforced permissions have to confine it to the defined few.
6Evidence
The satisfied version of 3.3.9 shows a defined, narrower subset and enforcement confining audit management to it.
| Evidence | What it demonstrates |
|---|---|
| Defined audit management subset | Objective [a]. The named privileged users permitted to manage logging. |
| Permission configuration | Objective [b]. Enforcement confining audit management to the subset. |
| Access review | Objectives [a], [b]. Confirmation that the subset is narrower than general administration. |
The evidence should show that only a defined, smaller subset can manage the logging and that permissions enforce it. The defined subset paired with the enforcing configuration is the clearest demonstration of the control.
If every admin can turn off logging, every admin can blind it
Control over the audit trail is only as narrow as the group that can disable it, and where that group is every administrator, any compromised admin account can silence the record. Narrowing audit management to a small, enforced subset is part of the onsite readiness work this practice does.
Start CMMC Readiness or call 802-335-26627Sources
- NIST Special Publication 800-171 Rev 2, Protecting Controlled Unclassified Information in Nonfederal Systems and Organizations, requirement 3.3.9. csrc.nist.gov
- NIST Special Publication 800-171A, Assessing Security Requirements for Controlled Unclassified Information, assessment objectives 3.3.9[a] and 3.3.9[b]. csrc.nist.gov
- 32 CFR 170.21, Plan of Action and Milestones Requirements, governing which requirements may remain open at a Level 2 assessment. ecfr.gov