Redshift Using Default Port

• Query id: a478af30-8c3a-404d-aa64-0b673cee509a
• Query name: Redshift Using Default Port
• Platform: CloudFormation
• Severity: Low
• Category: Networking and Firewall
• URL: Github

Description

Redshift should not use the default port (5439) because an attacker can easily guess the port
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

Resources:
  myCluster:
    Type: "AWS::Redshift::Cluster"
    Properties:
      PubliclyAccessible: false
      DBName: "mydb"
      MasterUsername: "master"
      MasterUserPassword:
        Ref: "MasterUserPassword"
      NodeType: "ds2.xlarge"
      ClusterType: "single-node"
      Tags:
        - Key: foo
          Value: bar
  myCluster2:
    Type: "AWS::Redshift::Cluster"
    Properties:
      PubliclyAccessible: false
      DBName: "mydb"
      MasterUsername: "master"
      MasterUserPassword:
        Ref: "MasterUserPassword"
      NodeType: "ds2.xlarge"
      ClusterType: "single-node"
      Tags:
        - Key: foo
          Value: bar
      Port: 5439

Positive test num. 2 - json file

{
  "Resources": {
    "myCluster": {
      "Type": "AWS::Redshift::Cluster",
      "Properties": {
        "NodeType": "ds2.xlarge",
        "ClusterType": "single-node",
        "Tags": [
          {
            "Key": "foo",
            "Value": "bar"
          }
        ],
        "PubliclyAccessible": true,
        "DBName": "mydb",
        "MasterUsername": "master",
        "MasterUserPassword": {
          "Ref": "MasterUserPassword"
        }
      }
    },
    "myCluster2": {
      "Type": "AWS::Redshift::Cluster",
      "Properties": {
        "Tags": [
          {
            "Key": "foo",
            "Value": "bar"
          }
        ],
        "PubliclyAccessible": true,
        "DBName": "mydb",
        "MasterUsername": "master",
        "MasterUserPassword": {
          "Ref": "MasterUserPassword"
        },
        "NodeType": "ds2.xlarge",
        "ClusterType": "single-node",
        "Port": 5439
      }
    }
  }
}

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

Resources:
  myCluster:
    Type: "AWS::Redshift::Cluster"
    Properties:
      PubliclyAccessible: false
      DBName: "mydb"
      MasterUsername: "master"
      MasterUserPassword:
        Ref: "MasterUserPassword"
      NodeType: "ds2.xlarge"
      ClusterType: "single-node"
      Tags:
        - Key: foo
          Value: bar
      Port: 1150

Negative test num. 2 - json file

{
    "Resources": {
      "myCluster": {
        "Type": "AWS::Redshift::Cluster",
        "Properties": {
          "MasterUserPassword": {
            "Ref": "MasterUserPassword"
          },
          "NodeType": "ds2.xlarge",
          "ClusterType": "single-node",
          "Tags": [
            {
              "Value": "bar",
              "Key": "foo"
            }
          ],
          "PubliclyAccessible": false,
          "DBName": "mydb",
          "MasterUsername": "master",
          "Port": "1150"
        }
      }
    }
  }