AD-GPOREP-08: GPOs with deny ACE details should be retrievable
| ID | AD-GPOREP-08 |
| Severity | Medium |
| Suite | Active Directory (on-premises) |
| Product | Active Directory |
| Feature | Group Policy |
| Security area | Access control |
| Resource type | GroupPolicy |
| User impact of fixing | Low |
| Effort to fix | Medium |
| Reads from | On-premises Active Directory |
What this checks and how to fix it
Section titled “What this checks and how to fix it”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/
Mito check. Author: soulemike. Open-source licences.
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