Title

NixOS must take action when allocated audit record storage volume reaches 90 percent of the repository maximum audit record storage capacity. (Cat II impact)

Discussion

If security personnel are not notified immediately when storage volume reaches 90 percent utilization, they are unable to plan for audit record storage capacity expansion.

Check Content

Verify NixOS takes action when allocated audit record storage volume reaches 90 percent of the repository maximum audit record storage capacity with the following commands: $ sudo grep -w admin_space_left /etc/audit/auditd.conf admin_space_left = 10% If the value of the "admin_space_left" keyword is not set to "10%" or if the line is commented out, this is a finding.

Fix Text

Configure the operating system to initiate an action to notify the system administrator (SA) and information system security officer (ISSO) (at a minimum) when allocated audit record storage volume reaches 90 percent of the repository maximum audit record storage capacity. Add or update the 'environment.etc."audit/auditd.conf".text' configuration in /etc/nixos/configuration.nix to include the following: environment.etc."audit/auditd.conf".text = [ '' admin_space_left = 10% '' ]; Rebuild the NixOS configuration with the following command: $ sudo nixos-rebuild switch

Additional Identifiers

Rule ID: SV-268104r1039200_rule

Vulnerability ID: V-268104

Group Title: SRG-OS-000046-GPOS-00022

Expert Comments

CCIs tied to check.

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