MQ broker is publicly accessible

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Metadata

Id: terraform-aws-mq-broker-is-publicly-accessible

Provider: AWS

Platform: Terraform

Severity: High

Category: Insecure Configurations

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Description

This check verifies if AWS MQ brokers have the publicly_accessible attribute set to true, which makes them accessible from the internet. When an MQ broker is publicly accessible, it increases the attack surface and the risk of unauthorized access, potentially leading to data breaches or service disruption. To secure your MQ broker, omit the publicly_accessible attribute or explicitly set it to false, as shown below:

resource "aws_mq_broker" "secure_broker" {
  broker_name = "example"
  engine_type = "ActiveMQ"
  // Other configurations
  
  // Either omit this line completely or set to false
  publicly_accessible = false
}

Compliant Code Examples

resource "aws_mq_broker" "negative1" {
  broker_name = "example"

  configuration {
    id       = aws_mq_configuration.test.id
    revision = aws_mq_configuration.test.latest_revision
  }

  engine_type        = "ActiveMQ"
  engine_version     = "5.15.0"
  host_instance_type = "mq.t2.micro"
  security_groups    = [aws_security_group.test.id]

  user {
    username = "ExampleUser"
    password = "MindTheGap"
  }
}

Non-Compliant Code Examples

resource "aws_mq_broker" "positive1" {
  broker_name = "example"

  configuration {
    id       = aws_mq_configuration.test.id
    revision = aws_mq_configuration.test.latest_revision
  }

  engine_type        = "ActiveMQ"
  engine_version     = "5.15.0"
  host_instance_type = "mq.t2.micro"
  security_groups    = [aws_security_group.test.id]

  user {
    username = "ExampleUser"
    password = "MindTheGap"
  }

  publicly_accessible = true
}