Infoblox DNS servers must be configured to protect the authenticity of communications sessions for dynamic updates.

DNS is a fundamental network service that is prone to various attacks, such as cache poisoning and man-in-the middle attacks. If communication sessions are not provided appropriate validity protections, such as the employment of DNSSEC, the authenticity of the data cannot be guaranteed.

Note: For Infoblox DNS systems on a Classified network, this requirement is Not Applicable.

Infoblox Systems can be configured in two ways to limit DDNS client updates.

For clients that support GSS-TSIG, navigate to Data Management >> DNS >> Members/Servers tab.

Review each server with the DNS service enabled. Select each server, click "Edit", toggle Advanced Mode and select GSS-TSIG. Verify that "Enable GSS-TSIG authentication of clients" is enabled.

For clients that do not support GSS-TSIG, navigate to Data Management >> DNS >> Members/Servers tab.

Review each server with the DNS service enabled. Select each server, click "Edit". Select the "Updates" tab.

Verify that either a Named ACL or Set of ACEs are defined to limit client DDNS. When complete, click "Cancel" to exit the "Properties" screen.

If clients that support GSS-TSIG do not have "Enable GSS-TSIG authentication of clients" set or a named ACL or set of ACEs for clients that do not support GSS-TSIG, this is a finding.

Infoblox Systems can be configured in two ways to limit DDNS client updates.

For clients that support GSS-TSIG, navigate to Data Management >> DNS >> Members/Servers tab.

Review each server with the DNS service enabled. Select each server, click "Edit", toggle Advanced Mode and select GSS-TSIG. Configure the option "Enable GSS-TSIG authentication of clients". Upload the required keys. Refer to the Administration Guide for detailed instructions.

For clients that do not support GSS-TSIG, navigate to Data Management >> DNS >> Members/Servers tab.

Review each server with the DNS service enabled. Select each server, click "Edit". Select the "Updates" tab. Select either an existing Named ACL or configure a new Set of ACEs to limit client DDNS. When complete, click "Save & Close" to save the changes and exit the "Properties" screen.

Perform a service restart if necessary.