Load Balancers Should Not Allow Weak Cypher Suites

More Info:

Ensure no HTTPS or SSL proxy load balancers permit SSL policies with weak cipher suites.

Risk Level

High

Address

Security

Compliance Standards

CISGCP, CBP, HITRUST, SOC2, NISTCSF, PCIDSS

Triage and Remediation

Remediation

Using Console

Using CLI

To remediate the misconfiguration “Load Balancers Should Not Allow Weak Cipher Suites” for GCP using GCP CLI, follow the below steps:

Open the Cloud Shell in the GCP console.
Run the following command to list all the load balancers in your project:

gcloud compute url-maps list

Note down the name of the load balancer that you want to remediate.
Run the following command to describe the load balancer:

gcloud compute url-maps describe [LOAD_BALANCER_NAME]

In the output, look for the “sslPolicy” field. If the value is set to “ssl-policy-minimal”, then the load balancer is using the default SSL policy which allows weak cipher suites.
Run the following command to update the SSL policy of the load balancer:

gcloud compute url-maps set-ssl-policy [LOAD_BALANCER_NAME] --ssl-policy=[SSL_POLICY_NAME]

Replace [LOAD_BALANCER_NAME] with the name of the load balancer that you want to remediate and [SSL_POLICY_NAME] with the name of the SSL policy that disallows weak cipher suites. You can use the predefined SSL policies provided by GCP or create a custom SSL policy that disallows weak cipher suites.

Verify that the SSL policy has been updated by running the following command:

gcloud compute url-maps describe [LOAD_BALANCER_NAME]

In the output, verify that the “sslPolicy” field now has the value of the SSL policy that disallows weak cipher suites.By following these steps, you can remediate the misconfiguration “Load Balancers Should Not Allow Weak Cipher Suites” for GCP using GCP CLI.

Using Python

To remediate the issue of load balancers allowing weak cipher suites in GCP using Python, follow these steps:

Install the Google Cloud SDK on your local machine and authenticate using your Google Cloud account credentials.
Use the Cloud Load Balancing API to get a list of all the load balancers in your GCP project.
For each load balancer, retrieve its SSL policy using the get_ssl_policy() method.
Check if the SSL policy allows weak cipher suites by iterating over the ciphers list and looking for any ciphers that are considered weak.
If any weak cipher suites are found, create a new SSL policy with the same settings as the existing policy but with the weak ciphers removed using the create_ssl_policy() method.
Update the load balancer to use the new SSL policy using the set_ssl_policy() method.

Here is an example Python code snippet that demonstrates how to remediate the issue:

from google.cloud import compute_v1

# Initialize the Compute Engine API client
client = compute_v1.LoadBalancerClient()

# Get a list of all the load balancers in the project
project_id = 'your-project-id'
region = 'us-central1'
load_balancers = client.list(project_id, region)

# Iterate over each load balancer and check its SSL policy
for lb in load_balancers:
    ssl_policy_name = lb.ssl_policy.split('/')[-1]
    ssl_policy = client.get_ssl_policy(project_id, ssl_policy_name)

    # Check if the SSL policy allows weak cipher suites
    weak_ciphers = ['DES-CBC3-SHA', 'RC4-MD5', 'RC4-SHA']
    for cipher in ssl_policy.ciphers:
        if cipher in weak_ciphers:
            # Create a new SSL policy without the weak ciphers
            new_ciphers = [c for c in ssl_policy.ciphers if c not in weak_ciphers]
            new_ssl_policy = compute_v1.SslPolicy(
                name='new-ssl-policy',
                profile=ssl_policy.profile,
                min_tls_version=ssl_policy.min_tls_version,
                ciphers=new_ciphers
            )
            client.create_ssl_policy(project_id, new_ssl_policy)

            # Update the load balancer to use the new SSL policy
            lb.ssl_policy = f'projects/{project_id}/global/sslPolicies/new-ssl-policy'
            client.set_ssl_policy(project_id, region, lb.name, lb)

Note that this code is just an example and may need to be modified to fit your specific use case. Additionally, it is important to thoroughly test any changes made to load balancers to ensure that they do not cause any unexpected issues or downtime.

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Load Balancers Should Not Allow Weak Cypher Suites

More Info:

Risk Level

Address

Compliance Standards

Triage and Remediation

Remediation

GCP Introduction

GCP Pricing

GCP Threats

GCP Misconfigurations

Resources

GCP Threats

​More Info:

​Risk Level

​Address

​Compliance Standards

​Triage and Remediation

​Remediation

More Info:

Risk Level

Address

Compliance Standards

Triage and Remediation

Remediation