STIGQter STIGQter: STIG Summary: Microsoft Windows Server Domain Name System (DNS) Security Technical Implementation Guide Version: 2 Release: 5 Benchmark Date: 01 Jul 2026:

In a split DNS configuration between the external and internal networks, the external name server must be configured to not be reachable from inside resolvers.

DISA Rule

SV-259353r961863_rule

Vulnerability Number

V-259353

Group Title

SRG-APP-000516-DNS-000092

Rule Version

WDNS-22-000022

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure the external DNS server's firewall policy, or the network firewall, to block queries from internal hosts.

Check Contents

Consult with the system administrator to review the external Windows DNS Server's DOD approved firewall policy.

The inbound TCP and UDP ports 53 rule should be configured to only restrict IP addresses from the internal network.

If the DOD-approved firewall policy is not configured with the restriction, consult with the network firewall administrator to confirm the restriction on the network firewall.

If neither the DNS server's DOD approved firewall policy nor the network firewall is configured to block internal hosts from querying the external DNS server, this is a finding.

Vulnerability Number

V-259353

Documentable

False

Rule Version

WDNS-22-000022

Severity Override Guidance

Consult with the system administrator to review the external Windows DNS Server's DOD approved firewall policy.

The inbound TCP and UDP ports 53 rule should be configured to only restrict IP addresses from the internal network.

If the DOD-approved firewall policy is not configured with the restriction, consult with the network firewall administrator to confirm the restriction on the network firewall.

If neither the DNS server's DOD approved firewall policy nor the network firewall is configured to block internal hosts from querying the external DNS server, this is a finding.

Check Content Reference

M

Target Key

5576