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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-Controls CSA-CCM ISO-27001 NIST-800-53 SOC-2
  • Snyk ID SNYK-CC-00239
  • credit Snyk 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"
  }
}