Vulnerability Discussion

To ensure that DNS resolver settings are respected, a DNS mode in Network Manager must be configured. The following are common DNS values in "NetworkManager.conf [main]":

- default: NetworkManager will update "/etc/resolv.conf" to reflect the nameservers provided by currently active connections.
- none: NetworkManager will not modify "/etc/resolv.conf". Used when DNS is managed manually or by another service.
- systemd-resolved: Uses "systemd-resolved" to manage DNS.
- dnsmasq: Enables the internal "dnsmasq" plugin.

Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00091

Check

Verify RHEL 10 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 set to "dnsmasq", this is a finding.

Note: If RHEL 10 is configured to use a DNS resolver other than Network Manager, the configuration must be documented and approved by the information system security officer.

Fix

Configure RHEL 10 to use a DNS mode in Network Manager.

In "/etc/NetworkManager/NetworkManager.conf", add the following line in the "[main]" section:

dns = none

Where <dns processing mode> is default, none, or systemd-resolved.

Network Manager must be reloaded for the change to take effect:

$ sudo systemctl reload NetworkManager