Public IP on EC2 Instances

ID: ec2-public-ip

Severity: unknown

Author: princechaddha

Tags: cloud,devops,aws,amazon,ec2,aws-cloud-config

Description

Ensures Amazon EC2 instances, especially backend ones, do not use public IP addresses to minimize Internet exposure.

YAML Source

id: ec2-public-ip
info:
  name: Public IP on EC2 Instances
  author: princechaddha
  severity: unknown
  description: |
    Ensures Amazon EC2 instances, especially backend ones, do not use public IP addresses to minimize Internet exposure.
  impact: |
    Instances with public IP addresses are more vulnerable to Internet-based threats, compromising network security.
  remediation: |
    Restrict public IP assignment for EC2 instances, particularly for backend instances. Use private IPs and manage access via AWS VPC and security groups.
  reference:
    - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-instance-addressing.html#concepts-public-addresses
  metadata:
    max-request: 2
  tags: cloud,devops,aws,amazon,ec2,aws-cloud-config
variables:
  region: "us-east-1"

flow: |
  code(1)
  for(let InstancesName of iterate(template.instances)){
    set("ec2instance", InstancesName)
    code(2)
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      aws ec2 describe-instances --region $region --output json --query 'Reservations[*].Instances[*].InstanceId'

    extractors:
      - type: json
        name: instances
        internal: true
        json:
          - '.[].[]'

  - engine:
      - sh
      - bash
    source: |
         aws ec2 describe-instances --region $region --instance-ids $ec2instance --query "Reservations[*].Instances[*].NetworkInterfaces[*].Association.IpOwnerId[] | []"

    matchers:
      - type: word
        words:
          - "amazon"

    extractors:
      - type: dsl
        dsl:
          - '"The Amazon Instance " + ec2instance + " uses public IP addresses"'
# digest: 4b0a004830460221008dc735d938a4e9110dbaf80a7c1a80c49b5333d9d1f3bbb165c85f6343feeeaa022100ce908b4252ab0899a33fd09d19c8e71996bd6bc867f49e4c86442d1cd7202bd9:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "cloud/aws/ec2/ec2-public-ip.yaml"

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