Elasticsearch Domain With Vulnerable Policy

• Query id: 16c4216a-50d3-4785-bfb2-4adb5144a8ba
• Query name: Elasticsearch Domain With Vulnerable Policy
• Platform: Terraform
• Severity: Medium
• Category: Access Control
• URL: Github

Description

Elasticsearch Domain policy should avoid wildcard in 'Action' and 'Principal'.
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - tf file

provider "aws" {
  region = "us-east-1"
}

resource "aws_elasticsearch_domain" "es-not-secure-policy" {
  domain_name = "es-not-secure-policy"

  ebs_options {
    ebs_enabled = true
    volume_size = 10
    volume_type = "gp2"
  }
}

resource "aws_elasticsearch_domain_policy" "main" {
  domain_name = aws_elasticsearch_domain.es-not-secure-policy.domain_name

  access_policies = <<POLICIES
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": "es:*",
            "Principal": "*",
            "Effect": "Allow"
        }
    ]
}
POLICIES
}

Code samples without security vulnerabilities

Negative test num. 1 - tf file

resource "aws_elasticsearch_domain" "example2" {
  domain_name           = "tf-test"
  elasticsearch_version = "2.3"
}

resource "aws_elasticsearch_domain_policy" "main2" {
  domain_name = aws_elasticsearch_domain.example2.domain_name

  access_policies = <<POLICIES
{
    "Version": "2012-10-17",
    "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": [
          "arn:aws:iam::123456789012:user/test-user"
        ]
      },
      "Action": [
        "es:ESHttpGet"
      ],
      "Resource": "arn:aws:es:us-west-1:987654321098:domain/test-domain/test-index/_search"
    }
  ]
}
POLICIES
}