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

NixOS must generate an audit record for successful/unsuccessful modifications to the cron configuration.

DISA Rule

SV-268097r1130996_rule

Vulnerability Number

V-268097

Group Title

SRG-OS-000042-GPOS-00020

Rule Version

ANIX-00-000300

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.

Weight

10

Fix Recommendation

Configure NixOS to generate audit records when successful/unsuccessful attempts to modify the cron configuration occur.

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

security.audit.rules = [
"-w /var/cron/tabs/ -p wa -k services"
"-w /var/cron/cron.allow -p wa -k services"
"-w /var/cron/cron.deny -p wa -k services"
];

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

Check Contents

Verify NixOS generates an audit record when successful/unsuccessful attempts to modify the cron configuration.

Check the auditing rules currently loaded into the audit daemon with the following command:

$ sudo auditctl -l | grep -w cron

-w /var/cron/tabs/ -p wa -k services
-w /var/cron/cron.allow -p wa -k services
-w /var/cron/cron.deny -p wa -k services

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-268097

Documentable

False

Rule Version

ANIX-00-000300

Severity Override Guidance

Verify NixOS generates an audit record when successful/unsuccessful attempts to modify the cron configuration.

Check the auditing rules currently loaded into the audit daemon with the following command:

$ sudo auditctl -l | grep -w cron

-w /var/cron/tabs/ -p wa -k services
-w /var/cron/cron.allow -p wa -k services
-w /var/cron/cron.deny -p wa -k services

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