CloudTrail SNS Topic Name Undefined

• Query id: 3e09413f-471e-40f3-8626-990c79ae63f3
• Query name: CloudTrail SNS Topic Name Undefined
• Platform: CloudFormation
• Severity: Medium
• Category: Observability
• URL: Github

Description

Check if SNS topic name is set for CloudTrail
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - yaml file

AWSTemplateFormatVersion: "2010-09-09"
Parameters:
  OperatorEmail:
    Description: "Email address to notify when new logs are published."
    Type: String
Resources:
  myTrail3:
    DependsOn:
      - BucketPolicy
      - TopicPolicy
    Type: AWS::CloudTrail::Trail
    Properties:
      S3BucketName:
        Ref: S3Bucket
      IsLogging: false
      IsMultiRegionTrail: true
  myTrail4:
    DependsOn:
      - BucketPolicy
      - TopicPolicy
    Type: AWS::CloudTrail::Trail
    Properties:
      EnableLogFileValidation: false
      S3BucketName:
        Ref: S3Bucket
      SnsTopicName: ""
      IsLogging: false
      IsMultiRegionTrail: true

Positive test num. 2 - json file

{
  "Resources": {
    "myTrail5": {
      "DependsOn": [
        "BucketPolicy",
        "TopicPolicy"
      ],
      "Type": "AWS::CloudTrail::Trail",
      "Properties": {
        "IsMultiRegionTrail": true,
        "S3BucketName": {
          "Ref": "S3Bucket"
        },
        "IsLogging": false
      }
    },
    "myTrail6": {
      "DependsOn": [
        "BucketPolicy",
        "TopicPolicy"
      ],
      "Type": "AWS::CloudTrail::Trail",
      "Properties": {
        "EnableLogFileValidation": false,
        "S3BucketName": {
          "Ref": "S3Bucket"
        },
        "SnsTopicName": "",
        "IsLogging": false,
        "IsMultiRegionTrail": true
      }
    }
  },
  "AWSTemplateFormatVersion": "2010-09-09",
  "Parameters": {
    "OperatorEmail": {
      "Description": "Email address to notify when new logs are published.",
      "Type": "String"
    }
  }
}

Code samples without security vulnerabilities

Negative test num. 1 - yaml file

AWSTemplateFormatVersion: "2010-09-09"
Parameters:
  OperatorEmail:
    Description: "Email address to notify when new logs are published."
    Type: String
Resources:
  myTrail:
    DependsOn:
      - BucketPolicy
      - TopicPolicy
    Type: AWS::CloudTrail::Trail
    Properties:
      EnableLogFileValidation: true
      S3BucketName:
        Ref: S3Bucket
      SnsTopicName:
        Fn::GetAtt:
          - Topic
          - TopicName
      IsLogging: true
      IsMultiRegionTrail: true

Negative test num. 2 - json file

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Parameters": {
    "OperatorEmail": {
      "Type": "String",
      "Description": "Email address to notify when new logs are published."
    }
  },
  "Resources": {
    "myTrail2": {
      "DependsOn": [
        "BucketPolicy",
        "TopicPolicy"
      ],
      "Type": "AWS::CloudTrail::Trail",
      "Properties": {
        "IsLogging": true,
        "IsMultiRegionTrail": true,
        "EnableLogFileValidation": true,
        "S3BucketName": {
          "Ref": "S3Bucket"
        },
        "SnsTopicName": {
          "Fn::GetAtt": [
            "Topic",
            "TopicName"
          ]
        }
      }
    },
    "S3Bucket": {
      "DeletionPolicy": "Retain",
      "Type": "AWS::S3::Bucket",
      "Properties": {}
    }
  }
}