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AD-DCOMP-09: Computer DNS zone details should be investigated
ID AD-DCOMP-09
Severity Info
Suite Active Directory (on-premises)
Product Active Directory
Feature Computers
Security area Infrastructure hardening
Resource type DnsZone
Reads from On-premises Active Directory

What this checks and how to fix it

Section titled “What this checks and how to fix it”
  • Detailed analysis of DNS zone distribution provides visibility into Active Directory topology and helps identify potential configuration issues or security concerns related to DNS.

Security and Operational Value:

  • Topology Mapping: Understand how computers are distributed across DNS domains
  • Disjoint Namespace Detection: Identify computers in unexpected DNS zones
  • Configuration Validation: Verify computers are in appropriate zones
  • Compliance Verification: Ensure DNS configuration meets organizational standards

Potential Issues Identified:

  • Computers in incorrect DNS zones
  • Disjoint namespace misconfigurations
  • Orphaned computer accounts
  • DNS registration failures

Control Type

Section titled “Control Type”

Operational

Security Recommendation

Section titled “Security Recommendation”

  1. Zone Assignment Review:

    • Verify computers are in appropriate DNS zones
    • Investigate computers in unexpected zones
    • Document legitimate multi-zone scenarios

  2. DNS Configuration Audit:

    • Regular review of DNS zone configuration
    • Validate DNS delegation settings
    • Check for stale or orphaned records

  3. Remediation:

    • Move computers to correct zones if misconfigured
    • Delete stale computer accounts
    • Fix DNS registration issues

How the Test Works

Section titled “How the Test Works”

This test provides detailed analysis:

  • Breakdown of computers by DNS zone
  • Counts per zone with percentages
  • List of computers without DNS host names
  • Distribution statistics
Section titled “Related Tests”
  • Test-MtAdComputerDnsZoneCount - DNS zone count summary
  • Test-MtAdComputerDnsHostNameCount - DNS host name coverage
  • Test-MtAdAllowedDnsSuffixesCount - DNS suffix configuration

Mito check. Author: soulemike. Open-source licences.

Open-source licences. CIS Benchmark material © Center for Internet Security, Inc.; CISA SCuBA baselines are public domain (CC0).

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