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EC2 instance has public IP assigned Affecting EC2 service in AWS

Severity

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

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Frameworks
CIS-ControlsCSA-CCMISO-27001NIST-800-53SOC-2
  • Snyk IDSNYK-CC-00007
  • creditSnyk 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
  }
}