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1.431 RHEL-10-800300

Information

RHEL 10 must configure a DNS processing mode in Network Manager to avoid conflicts with other Domain Name Server (DNS) managers and to not leak DNS queries to untrusted networks.

GROUP ID: V-281362RULE ID: SV-281362r1167236

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

Solution

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

See Also

https://workbench.cisecurity.org/benchmarks/26403

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, 800-53|SC-7(9), CAT|II, CCI|CCI-001115, CCI|CCI-002385, Rule-ID|SV-281362r1167236_rule, STIG-ID|RHEL-10-800300, Vuln-ID|V-281362

Plugin: Unix

Control ID: 9cd324db95b98367fbc859c3f7699da8e0358d2f50281e5037c83360b497c8dc