Network Firewall firewalls should have subnet change protection enabled¶

This control checks whether subnet change protection is enabled for an AWS Network Firewall firewall. The control fails if subnet change protection isn't enabled for the firewall.

How to fix¶

Attribute subnet_change_protection of aws_networkfirewall_firewall must be true.

Implementation options¶

Choose the option that matches how you manage Terraform. All options satisfy this control.

Option 1: Terraform AWS provider resources¶

If you manage resources directly, configure the relevant Terraform AWS provider resources to meet this control. See docs for the resources involved: aws_networkfirewall_firewall.

resource "aws_networkfirewall_firewall" "this" {
  firewall_policy_arn = "arn:aws:network-firewall:us-east-1:123456789012:firewall-policy/example"
  name                = "pofix-example-firewall"

  subnet_mapping {
    subnet_id = "subnet-12345678"
  }

  vpc_id = "vpc-12345678"

  subnet_change_protection = true
}

Which option should I choose?

Compliance.tf module (recommended): controls enforced by default and mapped to frameworks.
Open source module (terraform-aws-modules): compatible by design with compliance.tf. Same variable names for an easy, low-change migration path when you are ready.
Terraform AWS provider resources: manage Terraform resources directly.

Tool mappings¶

Use these identifiers to cross-reference this control across tools, reports, and evidence.

Compliance.tf (CTF) Control: networkfirewall_firewall_subnet_change_protection_enabled
AWS Config Managed Rule: NETFW_SUBNET_CHANGE_PROTECTION_ENABLED
Powerpipe Control: aws_compliance.control.networkfirewall_firewall_subnet_change_protection_enabled