RHEL 9 must configure a DNS processing mode in Network Manager.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-257949 | RHEL-09-252040 | SV-257949r1014841_rule | Medium |
| Description |
| In order to ensure that DNS resolver settings are respected, a DNS mode in Network Manager must be configured. |
| STIG | Date |
| Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2024-12-04 |
Details
| Check Text (C-61690r1014840_chk) |
| 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. Note: If RHEL 9 is configured to use a DNS resolver other than Network Manager, the configuration must be documented and approved by the information system security officer (ISSO). |
| Fix Text (F-61614r925833_fix) |
| 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 |