ALB Listening on HTTP

• Query id: 275a3217-ca37-40c1-a6cf-bb57d245ab32
• Query name: ALB Listening on HTTP
• Platform: CloudFormation
• Severity: Medium
• Category: Networking and Firewall
• URL: Github

Description

AWS Application Load Balancer (alb) should not listen on HTTP
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

AWSTemplateFormatVersion: 2010-09-09
Resources:
    MyLoadBalancer:
        Type: AWS::ElasticLoadBalancing::LoadBalancer
        Properties:
          AvailabilityZones:
          - "us-east-2a"
          CrossZone: true
          Listeners:
          - InstancePort: '80'
            InstanceProtocol: HTTPS
            LoadBalancerPort: '443'
            Protocol: HTTP
            PolicyNames:
            - My-SSLNegotiation-Policy
            SSLCertificateId: arn:aws:iam::123456789012:server-certificate/my-server-certificate
          Scheme: internal
    HTTPlistener:
        Type: "AWS::ElasticLoadBalancingV2::Listener"
        Properties:
            DefaultActions:
            - Type: redirect
            LoadBalancerArn: !Ref myLoadBalancer
            Port: 80
            Protocol: HTTP

Positive test num. 2 - json file

{
  "Resources": {
    "MyLoadBalancer": {
      "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
      "Properties": {
        "CrossZone": true,
        "Listeners": [
          {
            "Protocol": "HTTP",
            "PolicyNames": [
              "My-SSLNegotiation-Policy"
            ],
            "SSLCertificateId": "arn:aws:iam::123456789012:server-certificate/my-server-certificate",
            "InstancePort": "80",
            "InstanceProtocol": "HTTPS",
            "LoadBalancerPort": "443"
          }
        ],
        "Scheme": "internal",
        "AvailabilityZones": [
          "us-east-2a"
        ]
      }
    },
    "HTTPlistener": {
      "Type": "AWS::ElasticLoadBalancingV2::Listener",
      "Properties": {
        "DefaultActions": [
          {
            "Type": "redirect"
          }
        ],
        "LoadBalancerArn": "myLoadBalancer",
        "Port": 80,
        "Protocol": "HTTP"
      }
    }
  },
  "AWSTemplateFormatVersion": "2010-09-09T00:00:00Z"
}

Positive test num. 3 - yaml file

Resources:
  HTTPlistener:
   Type: "AWS::ElasticLoadBalancingV2::Listener"
   Properties:
     DefaultActions:
       - Type: "redirect"
         RedirectConfig:
           Protocol: "HTTPS"
           Port: "443"
           Host: "#{host}"
           Path: "/#{path}"
           Query: "#{query}"
           StatusCode: "HTTP_301"
     LoadBalancerArn: !Ref myLoadBalancer
     Port: 80
     Protocol: "HTTP"

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

AWSTemplateFormatVersion: 2010-09-09
Resources:
    MyLoadBalancer:
        Type: AWS::ElasticLoadBalancing::LoadBalancer
        Properties:
          AvailabilityZones:
          - "us-east-2a"
          CrossZone: true
          Listeners:
          - InstancePort: '80'
            InstanceProtocol: HTTPS
            LoadBalancerPort: '443'
            Protocol: HTTPS
            PolicyNames:
            - My-SSLNegotiation-Policy
            SSLCertificateId: arn:aws:iam::123456789012:server-certificate/my-server-certificate
          Scheme: internal

Negative test num. 2 - json file

{
  "AWSTemplateFormatVersion": "2010-09-09T00:00:00Z",
  "Resources": {
    "MyLoadBalancer": {
      "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
      "Properties": {
        "CrossZone": true,
        "Listeners": [
          {
            "Protocol": "HTTPS",
            "PolicyNames": [
              "My-SSLNegotiation-Policy"
            ],
            "SSLCertificateId": "arn:aws:iam::123456789012:server-certificate/my-server-certificate",
            "InstancePort": "80",
            "InstanceProtocol": "HTTPS",
            "LoadBalancerPort": "443"
          }
        ],
        "Scheme": "internal",
        "AvailabilityZones": [
          "us-east-2a"
        ]
      }
    }
  }
}