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Version: 2.2.1-preview

AD-DCOMP-09 - Computer DNS zone details should be retrievable

Michael SouleMerill Fernando
Contributed by Michael Soule with Merill FernandoAll contributors →

Overview​

  • 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

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​

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
  • Test-MtAdComputerDnsZoneCount - DNS zone count summary
  • Test-MtAdComputerDnsHostNameCount - DNS host name coverage
  • Test-MtAdAllowedDnsSuffixesCount - DNS suffix configuration

Test Metadata​

FieldValue
Test IDAD-DCOMP-09
SeverityInfo
SuiteActive Directory
CategoryAD.Security
PowerShell testTest-MtAdComputerDnsZoneDetails
TagsAD, AD-DCOMP-09, AD.Security

Source​

  • Pester test: tests/ad/security/Test-MtAdComputerDnsZoneDetails.Tests.ps1
  • PowerShell source: powershell/public/ad/security/Test-MtAdComputerDnsZoneDetails.ps1