ELB Using Insecure Protocols

• Query id: 61a94903-3cd3-4780-88ec-fc918819b9c8
• Query name: ELB Using Insecure Protocols
• Platform: CloudFormation
• Severity: Medium
• Category: Encryption
• URL: Github

Description

ELB Predefined or Custom Security Policies must not use insecure protocols, to reduce the risk of the SSL connection between the client and the load balancer being exploited. That means the ELB Listeners must not have Policies that posses Protocols that coincide with any of a predefined list of insecure protocols.
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

#this is a problematic code where the query should report a result(s)
Resources:
    MyLoadBalancer:
        Type: AWS::ElasticLoadBalancing::LoadBalancer
        Properties:
          AvailabilityZones:
          - "us-east-2a"
          CrossZone: true
          Listeners:
          - InstancePort: '80'
            InstanceProtocol: HTTP
            LoadBalancerPort: '443'
            Protocol: HTTPS
            PolicyNames:
            - My-SSLNegotiation-Policy
            SSLCertificateId: arn:aws:iam::123456789012:server-certificate/my-server-certificate
          HealthCheck:
            Target: HTTP:80/
            HealthyThreshold: '2'
            UnhealthyThreshold: '3'
            Interval: '10'
            Timeout: '5'
          Policies:
          - PolicyName: My-SSLNegotiation-Policy
            PolicyType: SSLNegotiationPolicyType
            Attributes:
            - Name: Protocol-SSLv2
              Value: ELBSecurityPolicy-TLS-1-2-2017-01
            - Name: Reference-Security-Policy
              Value: ELBSecurityPolicy-TLS-1-2-2017-01
          - PolicyName: My-SSLNegotiation-Policy2
            PolicyType: SSLNegotiationPolicyType
            Attributes:
            - Name: Protocol-TLSv1
              Value: ELBSecurityPolicy-TLS-1-2-2017-01

Positive test num. 2 - json file

{
  "Resources": {
    "MyLoadBalancer": {
      "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
      "Properties": {
        "AvailabilityZones": [
          "us-east-2a"
        ],
        "CrossZone": true,
        "Listeners": [
          {
            "InstanceProtocol": "HTTP",
            "LoadBalancerPort": "443",
            "Protocol": "HTTPS",
            "PolicyNames": [
              "My-SSLNegotiation-Policy"
            ],
            "SSLCertificateId": "arn:aws:iam::123456789012:server-certificate/my-server-certificate",
            "InstancePort": "80"
          }
        ],
        "HealthCheck": {
          "HealthyThreshold": "2",
          "UnhealthyThreshold": "3",
          "Interval": "10",
          "Timeout": "5",
          "Target": "HTTP:80/"
        },
        "Policies": [
          {
            "PolicyName": "My-SSLNegotiation-Policy",
            "PolicyType": "SSLNegotiationPolicyType",
            "Attributes": [
              {
                "Name": "Protocol-SSLv2",
                "Value": "ELBSecurityPolicy-TLS-1-2-2017-01"
              },
              {
                "Name": "Reference-Security-Policy",
                "Value": "ELBSecurityPolicy-TLS-1-2-2017-01"
              }
            ]
          },
          {
            "PolicyName": "My-SSLNegotiation-Policy2",
            "PolicyType": "SSLNegotiationPolicyType",
            "Attributes": [
              {
                "Value": "ELBSecurityPolicy-TLS-1-2-2017-01",
                "Name": "Protocol-TLSv1"
              }
            ]
          }
        ]
      }
    }
  }
}

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

#this code is a correct code for which the query should not find any result
Resources:
    MyLoadBalancer:
        Type: AWS::ElasticLoadBalancing::LoadBalancer
        Properties:
          AvailabilityZones:
          - "us-east-2a"
          CrossZone: true
          Listeners:
          - InstancePort: '80'
            InstanceProtocol: HTTP
            LoadBalancerPort: '443'
            Protocol: HTTPS
            PolicyNames:
            - My-SSLNegotiation-Policy
            SSLCertificateId: arn:aws:iam::123456789012:server-certificate/my-server-certificate
          HealthCheck:
            Target: HTTP:80/
            HealthyThreshold: '2'
            UnhealthyThreshold: '3'
            Interval: '10'
            Timeout: '5'
          Policies:
          - PolicyName: My-SSLNegotiation-Policy
            PolicyType: SSLNegotiationPolicyType
            Attributes:
            - Name: Reference-Security-Policy
              Value: ELBSecurityPolicy-TLS-1-2-2017-01

Negative test num. 2 - json file

{
  "Resources": {
    "MyLoadBalancer": {
      "Type": "AWS::ElasticLoadBalancing::LoadBalancer",
      "Properties": {
        "HealthCheck": {
          "Interval": "10",
          "Timeout": "5",
          "Target": "HTTP:80/",
          "HealthyThreshold": "2",
          "UnhealthyThreshold": "3"
        },
        "Policies": [
          {
            "PolicyName": "My-SSLNegotiation-Policy",
            "PolicyType": "SSLNegotiationPolicyType",
            "Attributes": [
              {
                "Name": "Reference-Security-Policy",
                "Value": "ELBSecurityPolicy-TLS-1-2-2017-01"
              }
            ]
          }
        ],
        "AvailabilityZones": [
          "us-east-2a"
        ],
        "CrossZone": true,
        "Listeners": [
          {
            "PolicyNames": [
              "My-SSLNegotiation-Policy"
            ],
            "SSLCertificateId": "arn:aws:iam::123456789012:server-certificate/my-server-certificate",
            "InstancePort": "80",
            "InstanceProtocol": "HTTP",
            "LoadBalancerPort": "443",
            "Protocol": "HTTPS"
          }
        ]
      }
    }
  }
}