The “Allowed External IPs for VM Instances” misconfiguration in GCP means that the firewall rules for the virtual machine instances allow traffic from external IP addresses that are not authorized. To remediate this, you can follow these steps using the GCP CLI:

1. Open the Cloud Shell in the GCP Console.

2. Run the following command to list the firewall rules for the project:

gcloud compute firewall-rules list

3. Identify the firewall rule that needs to be updated to restrict the allowed external IPs.

4. Run the following command to update the firewall rule:

gcloud compute firewall-rules update [FIREWALL_RULE_NAME] --source-ranges=[AUTHORIZED_IP_RANGES]

Replace [FIREWALL_RULE_NAME] with the name of the firewall rule that needs to be updated, and [AUTHORIZED_IP_RANGES] with the comma-separated list of authorized IP ranges.

For example, if the firewall rule name is allow-http and the authorized IP ranges are 10.0.0.0/8,172.16.0.0/12,192.168.0.0/16, the command would be:

gcloud compute firewall-rules update allow-http --source-ranges=10.0.0.0/8,172.16.0.0/12,192.168.0.0/16

5. Verify that the firewall rule was updated by running the gcloud compute firewall-rules list command again and checking the sourceRanges field for the updated rule.

By following these steps, you can remediate the “Allowed External IPs for VM Instances” misconfiguration in GCP using the GCP CLI.

The “Allowed External IPs” configuration in GCP allows network traffic only from specific external IP addresses. To remediate this misconfiguration, you can follow these steps using Python:

1. Import the necessary libraries:

from google.cloud import compute_v1
from google.oauth2 import service_account

2. Set up the credentials:

credentials = service_account.Credentials.from_service_account_file('path/to/your/credentials.json')

3. Set up the client:

client = compute_v1.InstancesClient(credentials=credentials)

4. Define the project ID and zone where the instance is located:

project = 'your-project-id'
zone = 'your-zone'

5. Define the instance name:

instance_name = 'your-instance-name'

6. Get the instance:

instance = client.get(project=project, zone=zone, instance=instance_name)

7. Define the new list of allowed external IPs:

new_allowed_ips = [
    {
        "value": "x.x.x.x",
        "name": "ip-1"
    },
    {
        "value": "y.y.y.y",
        "name": "ip-2"
    }
]

where x.x.x.x and y.y.y.y are the IP addresses that you want to allow.

8. Update the instance with the new list of allowed external IPs:

access_configs = instance.network_interfaces[0].access_configs[0]
access_configs.nat_ip = None
access_configs.external_ip = None
access_configs.allowed = new_allowed_ips

request = {
    "project": project,
    "zone": zone,
    "instance": instance_name,
    "instance_resource": instance
}

response = client.update(**request)

This will update the instance with the new list of allowed external IPs. Note that this assumes that the instance has only one network interface and one access config. If there are multiple network interfaces or access configs, you will need to modify the code accordingly.