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V-22331

CAT III (Low)

For systems using DNS resolution, at least two name servers must be configured.

Rule ID

SV-44989r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-001182

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

Determine if DNS is enabled on the system.
# grep dns /etc/nsswitch.conf
If no line is returned, or any returned line is commented out, the system does not use DNS, and this is not applicable.

Determine the name servers used by the system.
# grep nameserver /etc/resolv.conf
If less than two lines are returned that are not commented out, this is a finding.

Fix Text

Edit /etc/resolv.conf and add additional "nameserver" lines until at least two are present.