To remediate the misconfiguration of having the VNC server port open on a GCP instance, you can follow the below steps using GCP CLI:

1. Open the Cloud Shell in the GCP Console.

2. Identify the instance that has the VNC server port open. You can use the following command to list all instances in your project:

   gcloud compute instances list
   

3. Once you have identified the instance, connect to it using SSH. You can use the following command to connect to the instance:

   gcloud compute ssh [INSTANCE_NAME]
   

4. Once you are connected to the instance, you need to find the VNC server process ID. You can use the following command to find the process ID:

   ps -ef | grep Xtightvnc
   

5. Once you have found the process ID, you can use the following command to kill the process:

   sudo kill [PROCESS_ID]
   

6. Next, you need to disable the VNC server from starting automatically on boot. You can use the following command to remove the VNC server startup script:

   sudo rm /etc/systemd/system/[email protected]
   

7. Finally, you need to ensure that the VNC server port is closed in the firewall. You can use the following command to remove the firewall rule that allows access to the VNC server port:

   gcloud compute firewall-rules delete [FIREWALL_RULE_NAME]
   

   Replace [FIREWALL_RULE_NAME] with the name of the firewall rule that allows access to the VNC server port.

After completing these steps, you will have successfully remediated the misconfiguration of having the VNC server port open on the GCP instance.

To remediate the misconfiguration of VNC Server Port being open in GCP using Python, you can follow the below steps:

1. First, you need to authenticate and authorize the GCP account using the Google Cloud SDK. You can do this by running the following command in the terminal:

   gcloud auth login
   

2. Next, you need to install the Python client library for GCP. You can do this by running the following command in the terminal:

   pip install google-cloud-storage
   

3. Once the library is installed, you can create a Python script to remediate the misconfiguration. The script should perform the following steps:

   a. Get a list of all the instances running in the GCP project using the Compute Engine API.

   b. For each instance, check if the VNC server port is open. You can do this by using the googleapiclient.discovery library to make a request to the Compute Engine API.

   c. If the VNC server port is open, use the googleapiclient.discovery library to make a request to the Compute Engine API to update the firewall rule and close the port.

4. Here is a sample Python script that you can use to remediate the misconfiguration:

   from googleapiclient import discovery
   from oauth2client.client import GoogleCredentials
   
   credentials = GoogleCredentials.get_application_default()
   
   compute = discovery.build('compute', 'v1', credentials=credentials)
   
   project = 'your-project-id'
   
   def list_instances(compute, project):
       result = compute.instances().list(project=project).execute()
       return result['items'] if 'items' in result else None
   
   instances = list_instances(compute, project)
   
   for instance in instances:
       for network_interface in instance['networkInterfaces']:
           for access_config in network_interface['accessConfigs']:
               if 'natIP' in access_config:
                   instance_ip = access_config['natIP']
                   firewall_rules = compute.firewalls().list(project=project).execute()
   
                   for firewall_rule in firewall_rules['items']:
                       if firewall_rule['name'] == 'vnc-server':
                           if 'allowed' in firewall_rule and 'ports' in firewall_rule['allowed'][0]:
                               if '5900' in firewall_rule['allowed'][0]['ports']:
                                   compute.firewalls().update(project=project, firewall=firewall_rule['name'], body={
                                       "name": "vnc-server",
                                       "allowed": [
                                           {
                                               "IPProtocol": "tcp",
                                               "ports": []
                                           }
                                       ],
                                       "sourceRanges": [
                                           "0.0.0.0/0"
                                       ],
                                       "targetTags": [
                                           "vnc-server"
                                       ]
                                   }).execute()
   

   Note: Replace your-project-id with the actual project ID.

5. Save the script and run it in the terminal using the following command:

   python script_name.py
   

   This will remediate the misconfiguration by closing the VNC server port in all the instances running in the GCP project.