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Check: RHEL-09-252040

RHEL 9 STIG: RHEL-09-252040 (in versions v1 r3 through v1 r1)

Title

RHEL 9 must configure a DNS processing mode set be Network Manager. (Cat II impact)

Discussion

In order to ensure that DNS resolver settings are respected, a DNS mode in Network Manager must be configured.

Check Content

Verify that RHEL 9 has a DNS mode configured in Network Manager. $ NetworkManager --print-config [main] dns=none If the dns key under main does not exist or is not set to "none" or "default", this is a finding.

Fix Text

Configure NetworkManager in RHEL 9 to use a DNS mode. In "/etc/NetworkManager/NetworkManager.conf" add the following line in the "[main]" section: dns = none NetworkManager must be reloaded for the change to take effect. $ sudo systemctl reload NetworkManager

Additional Identifiers

Rule ID: SV-257949r925834_rule

Vulnerability ID: V-257949

Group Title: SRG-OS-000480-GPOS-00227

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CCIs

CCIs tied to check.

Number	Definition
CCI-000366	The organization implements the security configuration settings.

Controls

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

Number	Title
CM-6	Configuration Settings