ALB With Desync Mitigation Mode Should Be Set

More Info:

This rule checks an Application Load Balancer (ALB) is configured with a user defined desync mitigation mode. The rule is NON_COMPLIANT if ALB desync mitigation mode does not match with the user defined desync mitigation mode.

Risk Level

Medium

Address

Configuration

Compliance Standards

CBP

Triage and Remediation

Remediation

Using Console

Using CLI

To remediate the misconfiguration of ALB with Desync Mitigation Mode not being set in AWS Elastic Load Balancer using AWS CLI, follow these steps:

Open your terminal and ensure that you have the AWS CLI installed and configured with the necessary permissions to modify Elastic Load Balancers.
Run the following AWS CLI command to enable Desync Mitigation Mode for your Application Load Balancer (ALB):

aws elbv2 modify-load-balancer-attributes --load-balancer-arn <YOUR_ALB_ARN> --attributes Key=deletion_protection.enabled,Value=true Key=desync-mitigation-mode.enabled,Value=true

Replace <YOUR_ALB_ARN> with the ARN of your ALB.

Verify that the Desync Mitigation Mode has been successfully enabled by describing the load balancer attributes using the following AWS CLI command:

aws elbv2 describe-load-balancer-attributes --load-balancer-arn <YOUR_ALB_ARN>

Ensure that the desync-mitigation-mode.enabled attribute is set to true in the output.By following these steps, you can remediate the misconfiguration of ALB with Desync Mitigation Mode not being set in AWS Elastic Load Balancer using AWS CLI.

Using Python

To remediate the misconfiguration of ALB with Desync Mitigation Mode not being set in AWS Elastic Load Balancer using Python, you can use the AWS SDK for Python (Boto3) to update the ALB settings. Here are the step-by-step instructions to remediate this issue:

Install Boto3: Ensure you have Boto3 installed in your Python environment. You can install it using pip:

pip install boto3

Configure AWS Credentials: Make sure you have configured AWS credentials with the necessary permissions to update the ALB settings. You can do this by setting up the AWS CLI or by setting environment variables with access key and secret key.
Write Python Script: Create a Python script with the following code to update the ALB settings with Desync Mitigation Mode enabled:

import boto3

# Define the ALB ARN and Desync Mitigation Mode
alb_arn = 'YOUR_ALB_ARN'
desync_mode = 'monitor'  # Options: monitor | defensive | strict

# Create a Boto3 client for Elastic Load Balancing
elbv2_client = boto3.client('elbv2')

# Update the ALB settings with Desync Mitigation Mode
response = elbv2_client.modify_load_balancer_attributes(
    LoadBalancerArn=alb_arn,
    Attributes=[
        {
            'Key': 'routing.http.desyncmitigationmode',
            'Value': desync_mode
        },
    ]
)

print("ALB Desync Mitigation Mode set to:", desync_mode)

Replace ‘YOUR_ALB_ARN’ with the actual ARN of your ALB. You can find the ARN of your ALB in the AWS Management Console or by using the describe_load_balancers() method in Boto3.
Run the Script: Save the Python script and run it using Python. This will update the ALB settings with the Desync Mitigation Mode enabled.

By following these steps, you can remediate the misconfiguration of ALB with Desync Mitigation Mode not being set in AWS Elastic Load Balancer using Python.

AWS Introduction

AWS Pricing

AWS Threats

AWS Misconfigurations

ALB With Desync Mitigation Mode Should Be Set

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

​Remediation

More Info:

Risk Level

Address

Compliance Standards

Triage and Remediation

Remediation