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

NixOS must generate audit records for all usage of privileged commands.

DISA Rule

SV-268091r1130983_rule

Vulnerability Number

V-268091

Group Title

SRG-OS-000042-GPOS-00020

Rule Version

ANIX-00-000210

Severity

CAT II

CCI(s)

• CCI-000135 - Generate audit records containing the organization-defined additional information that is to be included in the audit records.
• CCI-000169 - Provide audit record generation capability for the event types the system is capable of auditing as defined in AU-2 a. on organization-defined information system components.
• CCI-000172 - Generate audit records for the event types defined in AU-2 c that include the audit record content defined in AU-3.
• CCI-003938 - Automatically generate audit records of the enforcement actions.
• CCI-002884 - Log organization-defined audit events for nonlocal maintenance and diagnostic sessions.
• CCI-004188 - Monitor the use of maintenance tools that execute with increased privilege.

Weight

10

Fix Recommendation

Configure NixOS to generate audit records for all execution of privileged functions.

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

security.audit.rules = [
"-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 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 generates audit records for all execution of privileged functions with the following command:

$ sudo auditctl -l | grep execve

-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 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 the command does not return the example output, this is a finding.

Note: The "-k" allows for specifying an arbitrary identifier. The string following "-k" does not need to match the example output above.

Vulnerability Number

V-268091

Documentable

False

Rule Version

ANIX-00-000210

Severity Override Guidance

Verify NixOS generates audit records for all execution of privileged functions with the following command:

$ sudo auditctl -l | grep execve

-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 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 the command does not return the example output, this is a finding.

Note: The "-k" allows for specifying an arbitrary identifier. The string following "-k" does not need to match the example output above.

Check Content Reference

M

Target Key

5658