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EC2 instance has public IP assigned Affecting EC2 service in AWS

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

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    Frameworks
    CIS-Controls CSA-CCM ISO-27001 NIST-800-53 SOC-2
  • Snyk ID SNYK-CC-00007
  • credit Snyk Research Team
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Description

EC2 instances with public IPs are potentially reachable over the internet. If NACLs and security group rules are relaxed your instances may be vulnerable to attack.

How to fix?

Set the associate_public_ip_address attribute to false.

Example Configuration

resource "aws_instance" "instance1" {
  ami           = "ami-0323c3dd2da7fabcd"
  instance_type = "t2.micro"
  subnet_id = "${aws_subnet.subnet1.id}"

  associate_public_ip_address = false
}

resource "aws_launch_configuration" "private" {
  name          = "web_config"
  image_id      = "ami-abcd1234"
  instance_type = "t2.micro"
  associate_public_ip_address = false
}

resource "aws_launch_template" "private" {
  name = "example"

  network_interfaces {
    associate_public_ip_address = false
  }
}