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

NixOS must enforce a delay of at least four seconds between logon prompts following a failed logon attempt.

DISA Rule

SV-268171r1134782_rule

Vulnerability Number

V-268171

Group Title

SRG-OS-000480-GPOS-00226

Rule Version

ANIX-00-001870

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

Configure NixOS to enforce a four-second delay between logon attempts.

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

security.loginDefs.settings."FAIL_DELAY" = "4";

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

Check Contents

Verify NixOS enforces a four-second delay between logon attempts with the following command:

$ grep -I delay /etc/login.defs

FAIL_DELAY 4

If "FAIL_DELAY" is not set to "4" or greater, is commented out, or is missing, this is a finding.

Vulnerability Number

V-268171

Documentable

False

Rule Version

ANIX-00-001870

Severity Override Guidance

Verify NixOS enforces a four-second delay between logon attempts with the following command:

$ grep -I delay /etc/login.defs

FAIL_DELAY 4

If "FAIL_DELAY" is not set to "4" or greater, is commented out, or is missing, this is a finding.

Check Content Reference

M

Target Key

5658