ElastiCache without VPC

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Metadata

Id: 5527dcfc-94f9-4bf6-b7d4-1b78850cf41f

Cloud Provider: AWS

Platform: Ansible

Severity: Low

Category: Networking and Firewall

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Description

ElastiCache clusters must be launched in a VPC to provide network isolation and reduce the risk of unauthorized access to cached data or lateral movement within your environment.

In Ansible playbooks, tasks using the community.aws.elasticache or elasticache modules must set the cache_subnet_group property to the name of an existing ElastiCache subnet group. A task where cache_subnet_group is undefined or null is flagged because omission typically results in resources being created outside a VPC or without the intended subnet isolation.

Secure Ansible example:

- name: Create ElastiCache cluster in VPC
  community.aws.elasticache:
    name: my-cache
    engine: redis
    cache_subnet_group: my-cache-subnet-group

Compliant Code Examples

- name: Basic example2
  community.aws.elasticache:
    name: "test-please-delete"
    state: present
    engine: memcached
    cache_engine_version: 1.4.14
    node_type: cache.m1.small
    num_nodes: 1
    cache_port: 11211
    cache_subnet_group: default
    zone: us-east-1d

Non-Compliant Code Examples

- name: Basic example
  community.aws.elasticache:
    name: "test-please-delete"
    state: present
    engine: memcached
    cache_engine_version: 1.4.14
    node_type: cache.m1.small
    num_nodes: 1
    cache_port: 11211
    cache_security_groups:
      - default
    zone: us-east-1d