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

NixOS must prevent all software from executing at higher privilege levels than users executing the software.

DISA Rule

SV-268148r1131097_rule

Vulnerability Number

V-268148

Group Title

SRG-OS-000326-GPOS-00126

Rule Version

ANIX-00-001280

Severity

CAT II

CCI(s)

• CCI-002233 - Prevent the organization-defined software from executing at higher privilege levels than users executing the software.

Weight

10

Fix Recommendation

Configure the audit service to produce audit records.

Add the following Nix code to the NixOS Configuration, usually located in /etc/nixos/configuration.nix or /etc/nixos/flake.nix:

security.auditd.enable = true;
security.audit.enable = true;

Add the following audit rules:

security.audit.rules = [
"-a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k execpriv"
"-a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k execpriv"
"-a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k execpriv"
"-a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k execpriv"
];

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

Check Contents

Verify NixOS audits and provides alerts of audit failures by running the following command:

$grep A -15 security.auditd /etc/nixos/configuration.nix

/etc/nixos/configuration.nix:

security.auditd.enable = true;
security.audit.enable = true;
security.audit.rules = [
''
<audit_rules>
''
]; security.audit.rules = [
"-a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k execpriv"
"-a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k execpriv"
"-a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k execpriv"
"-a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k execpriv"
];

If "security.auditd", "security.audit" and the additional modifications do not equal true, are missing, or are commented out, this is a finding.

Vulnerability Number

V-268148

Documentable

False

Rule Version

ANIX-00-001280

Severity Override Guidance

Verify NixOS audits and provides alerts of audit failures by running the following command:

$grep A -15 security.auditd /etc/nixos/configuration.nix

/etc/nixos/configuration.nix:

security.auditd.enable = true;
security.audit.enable = true;
security.audit.rules = [
''
<audit_rules>
''
]; security.audit.rules = [
"-a always,exit -F arch=b32 -S execve -C uid!=euid -F euid=0 -k execpriv"
"-a always,exit -F arch=b64 -S execve -C uid!=euid -F euid=0 -k execpriv"
"-a always,exit -F arch=b32 -S execve -C gid!=egid -F egid=0 -k execpriv"
"-a always,exit -F arch=b64 -S execve -C gid!=egid -F egid=0 -k execpriv"
];

If "security.auditd", "security.audit" and the additional modifications do not equal true, are missing, or are commented out, this is a finding.

Check Content Reference

M

Target Key

5658