Finding ID | Version | Rule ID | IA Controls | Severity |
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V-230504 | RHEL-08-040090 | SV-230504r809321_rule | Medium |
Description |
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Failure to restrict network connectivity only to authorized systems permits inbound connections from malicious systems. It also permits outbound connections that may facilitate exfiltration of DoD data. RHEL 8 incorporates the "firewalld" daemon, which allows for many different configurations. One of these configurations is zones. Zones can be utilized to a deny-all, allow-by-exception approach. The default "drop" zone will drop all incoming network packets unless it is explicitly allowed by the configuration file or is related to an outgoing network connection. |
STIG | Date |
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Red Hat Enterprise Linux 8 Security Technical Implementation Guide | 2021-12-03 |
Check Text ( C-33173r568258_chk ) |
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Verify "firewalld" is configured to employ a deny-all, allow-by-exception policy for allowing connections to other systems with the following commands: $ sudo firewall-cmd --state running $ sudo firewall-cmd --get-active-zones [custom] interfaces: ens33 $ sudo firewall-cmd --info-zone=[custom] | grep target target: DROP If no zones are active on the RHEL 8 interfaces or if the target is set to a different option other than "DROP", this is a finding. |
Fix Text (F-33148r809320_fix) |
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Configure the "firewalld" daemon to employ a deny-all, allow-by-exception with the following commands: $ sudo firewall-cmd --permanent --new-zone=[custom] $ sudo cp /usr/lib/firewalld/zones/drop.xml /etc/firewalld/zones/[custom].xml This will provide a clean configuration file to work with that employs a deny-all approach. Note: Add the exceptions that are required for mission functionality and update the short title in the xml file to match the [custom] zone name. Reload the firewall rules to make the new [custom] zone available to load: $ sudo firewall-cmd --reload Set the default zone to the new [custom] zone: $ sudo firewall-cmd --set-default-zone=[custom] Note: This is a runtime and permanent change. Add any interfaces to the new [custom] zone: $ sudo firewall-cmd --permanent --zone=[custom] --change-interface=ens33 Reload the firewall rules for changes to take effect: $ sudo firewall-cmd --reload |