GPOs with deny ACE details should be retrievable
AD-GPOREP-08MediumActive DirectoryGroup Policy
Part of Active Directory · Active Directory · Group Policy · All checks
Invoke-Maester -TestId AD-GPOREP-08Overview
Section titled “Overview”Control Type
Section titled “Control Type”Detective
Test-MtAdGpoDenyAceDetails
Section titled “Test-MtAdGpoDenyAceDetails”Returns details of GPO reports that include a Deny ACE.
Why This Test Matters
Section titled “Why This Test Matters”- Detective control: lists GPO reports that contain a Deny ACE which could block legitimate policy application.
Security Recommendation
Section titled “Security Recommendation”- Review and minimize Deny ACE usage; remove unnecessary permissions to reduce risk.
How the Test Works
Section titled “How the Test Works”- Reads GPO state, selects reports where HasDenyAce is true, and outputs a Markdown table of such GPOs.
Related Tests
Section titled “Related Tests”Test-MtAdGpoDenyAceCount.
Related links
Section titled “Related links”- Microsoft Learn - Group Policy management
- ANSSI checkpoint: https://www.anssi.gouv.fr/
Details
Section titled “Details”Every attribute of this check
| Field | Value |
|---|---|
| Test ID | AD-GPOREP-08 |
| Severity | Medium |
| Suite | Active Directory |
| Product | Active Directory |
| Feature | Group Policy |
| Area | Access control |
| Resource type | GroupPolicy |
| User impact | Low |
| Implementation cost | Medium |
| MITRE ATT&CK | None |
| PowerShell test | Test-MtAdGpoDenyAceDetails |
| Services | ActiveDirectory |
| Permissions | ActiveDirectory:Ldap:groupPolicyContainer.gPCFileSysPath:ReadProperty, ActiveDirectory:File:SYSVOL:Read |
Source
Section titled “Source”- Test:
tests/ad/gpo-state/Test.AD-GPOREP-08.ps1 - Documentation:
tests/ad/gpo-state/Test.AD-GPOREP-08.md