VPC subnet assigns public IP

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Metadata

Id: terraform-aws-vpc-subnet-assigns-public-ip

Provider: AWS

Platform: Terraform

Severity: Medium

Category: Networking and Firewall

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Description

This check ensures that AWS VPC subnets do not automatically assign public IP addresses by verifying the value of the map_public_ip_on_launch attribute. If this attribute is set to true, as shown in map_public_ip_on_launch = true, instances launched in the subnet will receive public IPs by default, potentially exposing them to the public internet. Leaving this misconfiguration unaddressed increases the risk of unauthorized access, data breaches, and external attacks.

Compliant Code Examples

resource "aws_vpc" "main2" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "negative1" {
  vpc_id     = aws_vpc.main2.id
  cidr_block = "10.0.1.0/24"

  tags = {
    Name = "Negative1"
  }
}

resource "aws_vpc" "main3" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "negative2" {
  vpc_id     = aws_vpc.main3.id
  cidr_block = "10.0.1.0/24"

  tags = {
    Name = "Negative2"
  }

  map_public_ip_on_launch = false
}

module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "3.7.0"

  name = "my-vpc"
  cidr = "10.0.0.0/16"

  azs             = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]
  private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]

  map_public_ip_on_launch = false
  enable_nat_gateway      = true
  enable_vpn_gateway      = true

  tags = {
    Terraform   = "true"
    Environment = "dev"
  }
}

Non-Compliant Code Examples

resource "aws_vpc" "main" {
  cidr_block = "10.0.0.0/16"
}

resource "aws_subnet" "positive" {
  vpc_id     = aws_vpc.main.id
  cidr_block = "10.0.1.0/24"

  tags = {
    Name = "Positive"
  }

  map_public_ip_on_launch = true
}

module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "3.7.0"

  name = "my-vpc"
  cidr = "10.0.0.0/16"

  azs             = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]
  private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]

  map_public_ip_on_launch = true
  enable_nat_gateway      = true
  enable_vpn_gateway      = true

  tags = {
    Terraform   = "true"
    Environment = "dev"
  }
}

module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "3.7.0"

  name = "my-vpc"
  cidr = "10.0.0.0/16"

  azs             = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]
  private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]

  enable_nat_gateway = true
  enable_vpn_gateway = true

  tags = {
    Terraform   = "true"
    Environment = "dev"
  }
}