ec2-unrestricted-opensearch: Unrestricted OpenSearch Access

id: ec2-unrestricted-opensearch
info:
  name: Unrestricted OpenSearch Access
  author: princechaddha
  severity: critical
  description: |
    Checks EC2 security groups for inbound rules allowing unrestricted access to OpenSearch on TCP port 9200. Restricts access to essential IP addresses only.
  impact: |
    Unrestricted access to OpenSearch can lead to unauthorized data access, modification, or denial of service attacks.
  remediation: |
    Modify EC2 security group rules to limit access to TCP port 9200 for OpenSearch, allowing only necessary IPs, implementing the principle of least privilege.
  reference:
    - https://en.wikipedia.org/wiki/OpenSearch
  tags: cloud,devops,aws,amazon,opensearch,aws-cloud-config

variables:
  region: "us-east-1"

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      aws ec2 describe-security-groups --region $region --filters Name=ip-permission.from-port,Values=9200 Name=ip-permission.to-port,Values=9200 Name=ip-permission.cidr,Values='0.0.0.0/0 or ::/0' --query 'SecurityGroups[*].GroupId' --output json

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

      - type: dsl
        dsl:
          - 'securitygroup + " security group(s) alows unrestricted access (0.0.0.0/0 or ::/0) on TCP port 9200"'
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