EC2 security group allows public access

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Metadata

Id: 5330b503-3319-44ff-9b1c-00ee873f728a

Cloud Provider: AWS

Platform: Ansible

Severity: High

Category: Insecure Configurations

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Description

Security group rules must not permit ingress from the public internet (0.0.0.0/0 or ::/0). Open rules expose instances to unauthorized access and automated attacks. In Ansible tasks using the amazon.aws.ec2_group or ec2_group modules, each entry in the rules list must not set cidr_ip to 0.0.0.0/0 or cidr_ipv6 to ::/0. This rule flags any rules item with those values. Instead, restrict access to specific CIDR ranges, reference other security groups, or require access via a bastion/VPN.

Secure example with a restricted CIDR:

- name: create ssh access for admin network
  amazon.aws.ec2_group:
    name: my-secgroup
    rules:
      - proto: tcp
        from_port: 22
        to_port: 22
        cidr_ip: 203.0.113.0/24

Compliant Code Examples

- name: example ec2 group2
  ec2_group1:
    name: example1
    description: an example EC2 group
    vpc_id: 12345
    region: eu-west-1a
    aws_secret_key: SECRET
    aws_access_key: ACCESS
    rules:
    - proto: tcp
      from_port: 80
      to_port: 80
      cidr_ip: 10.1.1.1/32

Non-Compliant Code Examples

- name: create minimal aurora instance in default VPC and default subnet group
  amazon.aws.rds_instance:
    engine: aurora
    db_instance_identifier: ansible-test-aurora-db-instance
    instance_type: db.t2.small
    password: "{{ password }}"
    username: "{{ username }}"
    cluster_id: ansible-test-cluster
    db_security_groups: ["example"]
- name: example ec2 group
  ec2_group:
    name: example
    description: an example EC2 group
    vpc_id: 12345
    region: eu-west-1a
    aws_secret_key: SECRET
    aws_access_key: ACCESS
    rules:
      - proto: tcp
        from_port: 80
        to_port: 80
        cidr_ip: 0.0.0.0/0