Open all ports remediation

Using Console

Using CLI

To remediate the misconfiguration “All Ports Should Not Be Open To Public” in GCP using GCP CLI, follow these steps:

First, identify the project and the VM instance that has all ports open to the public. You can use the following command to list all the VM instances in the project:
```
gcloud compute instances list
```
Once you have identified the VM instance, you can update its firewall rules to restrict access to only the required ports. You can use the following command to list all the firewall rules in the project:
```
gcloud compute firewall-rules list
```
Identify the firewall rule that allows all ports to be open to the public. You can use the following command to describe the firewall rule:
```
gcloud compute firewall-rules describe [FIREWALL_RULE_NAME]
```
Update the firewall rule to allow access only to the required ports. You can use the following command to update the firewall rule:
```
gcloud compute firewall-rules update [FIREWALL_RULE_NAME] --allow [PORTS_TO_ALLOW]
```
Replace [FIREWALL_RULE_NAME] with the name of the firewall rule that you want to update and [PORTS_TO_ALLOW] with the list of ports that you want to allow access to. For example, if you want to allow access only to ports 80 and 443, you can use the following command:
```
gcloud compute firewall-rules update [FIREWALL_RULE_NAME] --allow tcp:80,tcp:443
```
Verify that the firewall rule has been updated by listing all the firewall rules again:
```
gcloud compute firewall-rules list
```
Ensure that the firewall rule that you updated has the correct ports allowed.

By following these steps, you can remediate the misconfiguration “All Ports Should Not Be Open To Public” in GCP using GCP CLI.

Using Python

To remediate the misconfiguration “All Ports Should Not Be Open To Public” in GCP using Python, you can follow the below steps:

First, you need to identify the VM instances that have all ports open to public. You can use the GCP Python SDK to list all VM instances and their firewall rules.
Once you have identified the VM instances with the misconfiguration, you can use the GCP Python SDK to update the firewall rules and restrict the open ports. You can create a new firewall rule to allow only the required ports and protocols and delete the existing firewall rule that allows all ports.

Here is the sample Python code to remediate the misconfiguration “All Ports Should Not Be Open To Public” in GCP:

from google.cloud import compute_v1

# Create a compute client
client = compute_v1.InstancesClient()

# Get a list of all VM instances
project = 'your-project-id'
zone = 'us-central1-a'
instances = client.list(project=project, zone=zone)

# Loop through each instance and update the firewall rules
for instance in instances:
    # Get the current firewall rules for the instance
    firewall = client.get_firewall(project=project, firewall='default-allow-ssh')
    allowed = firewall.allowed

    # Create a new firewall rule to allow only required ports and protocols
    new_allowed = [
        compute_v1.FirewallAllPorts(
            IPProtocol='tcp',
            ports=['80', '443']  # Add the required ports here
        )
    ]

    # Update the firewall rule with the new allowed ports
    firewall.allowed = new_allowed
    client.update_firewall(project=project, firewall='default-allow-ssh', firewall_resource=firewall)

    # Delete the old firewall rule that allows all ports
    client.delete_firewall(project=project, firewall='default-allow-ssh')

Note: This code is just a sample and may need to be modified based on your specific requirements.

GCP Introduction

GCP Pricing

GCP Threats

GCP Misconfigurations

Resources

GCP Threats

Open all ports remediation

Triage and Remediation

Remediation

GCP Introduction

GCP Pricing

GCP Threats

GCP Misconfigurations

Resources

GCP Threats

​Triage and Remediation

​Remediation

Triage and Remediation

Remediation