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Public IPs are automatically mapped to instances Affecting VPC service in AWS

Severity

0.0
medium
0
10
Severity Framework
Snyk CCSS
Rule category
General/ Public Access

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Frameworks
CIS-ControlsCSA-CCMISO-27001NIST-800-53SOC-2
  • Snyk IDSNYK-CC-00239
  • creditSnyk Research Team
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Description

Instances launched in this subnet will be potentially accessible over public internet, which may lead to unauthorized access.

How to fix?

Set map_public_ip_on_launch attribute to false.

Example Configuration

resource "aws_subnet" "my_subnet" {
  vpc_id                  = aws_vpc.my_vpc2.id
  cidr_block              = "172.16.10.0/24"
  availability_zone       = "us-west-2a"
  map_public_ip_on_launch = false

  tags = {
    Name = "tf-example"
  }
}