STIGQter STIGQter: STIG Summary: Infoblox 8.x DNS Security Technical Implementation Guide Version: 1 Release: 3 Benchmark Date: 01 Jul 2026:

In a split DNS configuration, where separate DNS service members are used between the external and internal networks, the external DNS service member must be configured to not be reachable from inside resolvers.

DISA Rule

SV-233869r1082632_rule

Vulnerability Number

V-233869

Group Title

SRG-APP-000516-DNS-000092

Rule Version

IDNS-8X-400011

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Navigate to Data Management >> DNS >> Members tab.

For External DNS resolvers in a Split DNS configuration:
1. Select the Grid member(s) identified as running the External DNS service and click "Edit".
2. Under the Queries tab, enable and configure either an Access Control List (ACL) or set of Access Control Entries (ACE) allowing external clients and denying internal clients.
3. When complete, click "Save & Close" to save the changes and exit the "Properties" screen.
4. Perform a service restart if necessary.

ACLs for External members should end with "Any" allow at the end after denying internal networks.

Check Contents

Validation of this configuration item requires review of the network architecture and security configuration in addition to DNS service member configuration to verify that external DNS service members are not accessible from the internal network when a split DNS configuration is implemented.

1. Navigate to Data Management >> DNS >> Members tab.
2. Review the network configuration and access control of each Infoblox member that has the DNS service running.
3. Select each grid member and click "Edit". Review the "Queries" tab to verify that both queries and recursion options are enabled and allowed only from the respective client networks.

If a split DNS configuration is not used, this is not a finding.

If there is no access control configured or access control does not restrict queries and recursion to the respective client network, this is a finding.

Vulnerability Number

V-233869

Documentable

False

Rule Version

IDNS-8X-400011

Severity Override Guidance

Validation of this configuration item requires review of the network architecture and security configuration in addition to DNS service member configuration to verify that external DNS service members are not accessible from the internal network when a split DNS configuration is implemented.

1. Navigate to Data Management >> DNS >> Members tab.
2. Review the network configuration and access control of each Infoblox member that has the DNS service running.
3. Select each grid member and click "Edit". Review the "Queries" tab to verify that both queries and recursion options are enabled and allowed only from the respective client networks.

If a split DNS configuration is not used, this is not a finding.

If there is no access control configured or access control does not restrict queries and recursion to the respective client network, this is a finding.

Check Content Reference

M

Target Key

5251