WAF Global Rules Should Not Be Empty

Using Console

Using CLI

To remediate the misconfiguration of WAF Global Rules being empty in AWS CloudWatch using AWS CLI, follow these steps:

List the current WAF global rules in your AWS account to identify if there are any empty rules:

aws wafv2 list-rules --scope REGIONAL --query 'Rules[?DefaultAction.RuleActionName==`ALLOW` && count(Statements)==`0`]'

Identify the ARN of the empty WAF global rule that needs to be updated.
Update the empty WAF global rule with a valid rule statement. You can create a new rule statement using the AWS CLI or AWS Management Console. Here is an example of creating a new rule statement using AWS CLI:

aws wafv2 update-rule --name "YOUR_RULE_NAME" --scope REGIONAL --id YOUR_RULE_ID --description "YOUR_RULE_DESCRIPTION" --action "ALLOW" --statements "Statement={YOUR_STATEMENT_HERE}"

Validate the changes by listing the rules again to ensure the WAF global rule is no longer empty:

aws wafv2 list-rules --scope REGIONAL --query 'Rules[?RuleId==`YOUR_RULE_ID`]'

Monitor the WAF global rules regularly to ensure they are not empty and are effectively protecting your resources.

By following these steps, you can remediate the misconfiguration of empty WAF global rules in AWS CloudWatch using AWS CLI.

Using Python

To remediate the misconfiguration of empty WAF Global Rules in AWS CloudWatch using Python, you can follow these steps:

Install the necessary Python libraries:

pip install boto3

Use the following Python script to check if there are any empty WAF Global Rules and update them if found:

import boto3

# Initialize the AWS WAF client
waf_client = boto3.client('waf')

# Get a list of all WAF Global Rules
response = waf_client.list_rules()

# Check if there are any empty WAF Global Rules
empty_rules = [rule['RuleId'] for rule in response['Rules'] if not rule['Predicates']]

# If there are empty WAF Global Rules, update them
if empty_rules:
    for rule_id in empty_rules:
        # Get the details of the empty rule
        rule_details = waf_client.get_rule(RuleId=rule_id)
        
        # Add a sample predicate to the rule (you can customize this as needed)
        updated_rule = {
            'RuleId': rule_id,
            'ChangeToken': waf_client.get_change_token()['ChangeToken'],
            'Updates': [
                {
                    'Action': 'INSERT',
                    'Predicate': {
                        'Negated': False,
                        'Type': 'IPMatch',
                        'DataId': 'SampleIPSetId'  # Replace this with a valid IPSetId
                    }
                }
            ]
        }
        
        # Update the rule with the sample predicate
        waf_client.update_rule(**updated_rule)
        
        print(f'Updated WAF Global Rule {rule_id} with a sample predicate')

else:
    print('No empty WAF Global Rules found')

Replace 'SampleIPSetId' with a valid IPSetId and customize the predicate as needed.
Run the Python script to check for and update any empty WAF Global Rules in AWS CloudWatch.

This script will help you identify any empty WAF Global Rules and update them with a sample predicate. Make sure to customize the predicate data according to your specific requirements.

AWS Introduction

AWS Pricing

AWS Threats

AWS Misconfigurations

WAF Global Rules Should Not Be Empty

More Info:

Risk Level

Address

Compliance Standards

Triage and Remediation

Remediation

AWS Introduction

AWS Pricing

AWS Threats

AWS Misconfigurations

​More Info:

​Risk Level

​Address

​Compliance Standards

​Triage and Remediation