Title

For systems using DNS resolution, at least two name servers must be configured. (Cat III impact)

Discussion

To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolution could lead to the failure of security functions requiring name resolution, which may include time synchronization, centralized authentication, and remote system logging.

Check Content

Open a terminal session and use the following command to verify the DNS name servers. grep nameserver /etc/resolv.conf If less than two lines are returned that are not commented out, this is a finding.

Fix Text

Open a terminal session and use the following command to edit the /etc/resolv.conf and add additional "nameserver" lines until at least two are present. sudo pico /etc/resolv.conf

Additional Identifiers

Rule ID: SV-38766r1_rule

Vulnerability ID: V-22331

Group Title:

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.