From Infoblox 7.x DNS Security Technical Implementation Guide
Part of SRG-APP-000516-DNS-000112
Associated with: CCI-000366
The private keys in the KSK and ZSK key pairs must be protected from unauthorized access. If possible, the private keys should be stored off-line (with respect to the Internet-facing, DNSSEC-aware name server) in a physically secure, non-network-accessible machine along with the zone file master copy.
Note: For Infoblox DNS systems on a Classified network, this requirement is Not Applicable. By default KSK and ZSK private keys are stored on the Grid Master within the Infoblox database. No clients should be permitted to utilize the Grid Master DNS service. Navigate to Data Management >> DNS >> Zones Review each zone by selecting the zone and clicking "Edit", and selecting the "Name Servers" tab. If the Grid Master is a listed name server and not marked "Stealth", this is a finding. If a Hardware Security Module (HSM) is configured, KSK and ZSK private keys are encrypted and stored on the HSM, this is not a finding.
For each zone that is not in compliance reconfigure the "Name Servers" tab and modify the Grid Master by selecting "Stealth". When complete, click "Save & Close" to save the changes and exit the "Properties" screen. Perform a service restart if necessary.
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