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

NixOS must enforce password complexity by requiring that at least one uppercase character be used.

DISA Rule

SV-268126r1131057_rule

Vulnerability Number

V-268126

Group Title

SRG-OS-000069-GPOS-00037

Rule Version

ANIX-00-000730

Severity

CAT II

CCI(s)

• CCI-004066 - For password-based authentication, enforce organization-defined composition and complexity rules.

Weight

10

Fix Recommendation

Configure NixOS to enforce password complexity.

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

environment.etc."/security/pwquality.conf".text = ''
ucredit=-1
'';

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

Check Contents

Verify NixOS enforces password complexity by requiring at least one uppercase character with the following command:

$ grep ucredit /etc/security/pwquality.conf

ucredit=-1

If the value of "ucredit" is a positive number or is commented out, this is a finding.

Vulnerability Number

V-268126

Documentable

False

Rule Version

ANIX-00-000730

Severity Override Guidance

Verify NixOS enforces password complexity by requiring at least one uppercase character with the following command:

$ grep ucredit /etc/security/pwquality.conf

ucredit=-1

If the value of "ucredit" is a positive number or is commented out, this is a finding.

Check Content Reference

M

Target Key

5658