STIGQter: STIG Summary: Anduril NixOS Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 01 Oct 2025:

The NixOS audit system must take appropriate action when the audit storage volume is full.

DISA Rule

SV-268105r1131012_rule

Vulnerability Number

V-268105

Group Title

SRG-OS-000047-GPOS-00023

Rule Version

ANIX-00-000440

Severity

CAT II

CCI(s)

• CCI-000140 - Take organization-defined actions upon audit failure include, shutting down the system, overwriting oldest audit records, and stopping the generation of audit records.

Weight

10

Fix Recommendation

Configure NixOS to shut down by default upon audit failure (unless availability is an overriding concern).

If availability has been determined to be more important, and this decision is documented with the information system security officer (ISSO), configure the operating system to notify SA staff and information system security officer (ISSO) staff in the event of an audit processing failure by setting the "disk_full_action" to "SYSLOG".

Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix: (depending on configuration, "disk_full_action" can be set to "SYSLOG" or "SINGLE")

environment.etc."audit/auditd.conf".text = [
''
disk_full_action = HALT
''
];

Rebuild and switch to the new NixOS configuration:
$ sudo nixos-rebuild switch

Check Contents

Verify NixOS takes the appropriate action when the audit storage volume is full.

Check that NixOS takes the appropriate action when the audit storage volume is full using the following command:

$ sudo grep disk_full_action /etc/audit/auditd.conf

disk_full_action = HALT

If the value of the "disk_full_action" option is not "SYSLOG", "SINGLE", or "HALT", or the line is commented out, ask the system administrator (SA) to indicate how the system takes appropriate action when an audit storage volume is full. If there is no evidence of appropriate action, this is a finding.

Vulnerability Number

V-268105

Documentable

False

Rule Version

ANIX-00-000440

Severity Override Guidance

Verify NixOS takes the appropriate action when the audit storage volume is full.

Check that NixOS takes the appropriate action when the audit storage volume is full using the following command:

$ sudo grep disk_full_action /etc/audit/auditd.conf

disk_full_action = HALT

If the value of the "disk_full_action" option is not "SYSLOG", "SINGLE", or "HALT", or the line is commented out, ask the system administrator (SA) to indicate how the system takes appropriate action when an audit storage volume is full. If there is no evidence of appropriate action, this is a finding.

Check Content Reference

M

Target Key

5658