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NixOS must enable the built-in firewall.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-268078ANIX-00-000010SV-268078r1130947_ruleCCI-002322medium
Description
Without the ability to immediately disconnect or disable remote access, an attack or other compromise taking place would not be immediately stopped. Operating system remote access functionality must have the capability to immediately disconnect current users remotely accessing the information system and/or disable further remote access. The speed of disconnect or disablement varies based on the criticality of mission's functions and the need to eliminate immediate or future remote access to organizational information systems. The remote access functionality (e.g., RDP) may implement features such as automatic disconnect (or user-initiated disconnect) in case of adverse information based on an indicator of compromise or attack. Satisfies: SRG-OS-000298-GPOS-00116, SRG-OS-000096-GPOS-00050, SRG-OS-000297-GPOS-00115, SRG-OS-000480-GPOS-00232
STIGDate
Anduril NixOS Security Technical Implementation Guide2025-08-19

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-14.8Expeditious Disconnect / Disable Capability
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (9) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(1)Monitoring and Control
1.00
AC-17(9)Disconnect or Disable Access
1.00
AC-2(1)Automated System Account Management
1.00
AU-8Time Stamps
1.00
CM-6Configuration Settings
1.00
CM-7Least Functionality
1.00
SC-45(1)Synchronization with Authoritative Time Source
1.00
SC-5Denial-of-service Protection
1.00
SC-5(2)Capacity, Bandwidth, and Redundancy
1.00
CCI1 mapping
CCI-002322
1.00

Details

Check Text (C-268078r1130947_chk)

Verify NixOS has the network firewall enabled with the following command: $ sudo iptables -L | grep nixos-fw-log-refuse nixos-fw-log-refuse all -- anywhere anywhere Verify the firewall panic tools are present: $ which firewall-panic /run/current-system/sw/bin/firewall-panic $ which firewall-panic-off /run/current-system/sw/bin/firewall-panic-off If the "nixos-fw-log-refuse all -- anywhere anywhere" firewall rule is not present and the firewall panic commands are not found, this is a finding.

Fix Text (F-71905r1130946_fix)

Update the NixOS config, typically stored either in /etc/nixos/configuration.nix or /etc/nixos/flake.nix, to enforce firewall rules by adding the following configuration settings: networking.firewall.enable = true; Rebuild and switch to the new NixOS configuration: $ sudo nixos-rebuild switch