​
Event Information

  • The v1.compute.autoscalers.update event in GCP for Compute refers to an update made to an autoscaler resource in the Google Compute Engine.
  • This event indicates that changes have been made to the configuration of an autoscaler, which is responsible for automatically adjusting the number of instances in a managed instance group based on the workload.
  • The event could signify modifications to parameters such as target utilization, cooldown period, or minimum and maximum number of instances, allowing for more efficient scaling of resources based on demand.

​
Examples

  1. Unauthorized access: If security is impacted with v1.compute.autoscalers.update in GCP for Compute, it could potentially allow unauthorized users to modify the autoscaler configuration. This could lead to unauthorized scaling actions, such as increasing or decreasing the number of instances, which can impact the availability and performance of the application.

  2. Data exposure: A security impact could occur if v1.compute.autoscalers.update is exploited to modify the autoscaler configuration in a way that exposes sensitive data. For example, an attacker could modify the autoscaler to launch instances in a less secure network or with less restrictive access controls, potentially exposing sensitive data to unauthorized access.

  3. Denial of Service (DoS): An attacker could potentially exploit v1.compute.autoscalers.update to launch a DoS attack by modifying the autoscaler configuration to rapidly scale up or down the number of instances. This could overwhelm the application or infrastructure, leading to service disruptions or performance degradation.

​
Remediation

​
Using Console

To remediate the issues mentioned in the previous response for GCP Compute using the GCP console, you can follow these step-by-step instructions:

  1. Restricting SSH access:

    • Go to the GCP Console and navigate to the Compute Engine section.
    • Select the instance for which you want to restrict SSH access.
    • Click on the “Edit” button at the top of the page.
    • Scroll down to the “Firewalls” section and click on “Add firewall rule”.
    • Provide a name for the firewall rule and set the “Targets” to “All instances in the network”.
    • In the “Source IP ranges” field, enter the IP range from which you want to allow SSH access (e.g., your organization’s IP range).
    • Set the “Protocols and ports” to allow SSH (port 22) traffic.
    • Click on the “Create” button to save the firewall rule.

  2. Enabling VPC Flow Logs:

    • Go to the GCP Console and navigate to the VPC Network section.
    • Select the VPC network for which you want to enable flow logs.
    • Click on the “Edit” button at the top of the page.
    • Scroll down to the “Flow logs” section and click on “Add flow log”.
    • Provide a name for the flow log and select the desired configuration options (e.g., sampling rate, metadata inclusion).
    • Choose the desired destination for the flow logs (e.g., Stackdriver Logging, Cloud Storage).
    • Click on the “Create” button to enable flow logs for the VPC network.

  3. Implementing IAM best practices:

    • Go to the GCP Console and navigate to the IAM & Admin section.
    • Select the project for which you want to implement IAM best practices.
    • Click on the “IAM” tab to view the IAM roles and permissions.
    • Review the existing IAM roles and identify any unnecessary or overly permissive roles.
    • Remove any unnecessary roles and adjust the permissions of existing roles to follow the principle of least privilege.
    • Consider creating custom IAM roles with specific permissions tailored to the needs of different user groups.
    • Regularly review and audit the IAM roles and permissions to ensure they align with the organization’s security requirements.

​
Using CLI

  1. Enable VPC Flow Logs for GCP Compute instances:

    • Use the following command to enable VPC Flow Logs for a specific subnet: 
      gcloud compute networks subnets update [SUBNET_NAME] --enable-flow-logs

  2. Restrict SSH access to GCP Compute instances:

    • Create a new firewall rule to allow SSH access only from specific IP ranges: 
      gcloud compute firewall-rules create allow-ssh --allow tcp:22 --source-ranges [IP_RANGE]
    • Apply the firewall rule to the desired GCP Compute instances: 
      gcloud compute instances add-tags [INSTANCE_NAME] --tags allow-ssh

  3. Enable automatic OS patch management for GCP Compute instances:

    • Create a patch management policy: 
      gcloud compute os-config patch-policies create [POLICY_NAME] --os-filter=[OS_FILTER] --patch-window-start=[START_TIME] --patch-window-duration=[DURATION]
    • Apply the patch management policy to the desired GCP Compute instances: 
      gcloud compute instances add-metadata [INSTANCE_NAME] --metadata patch-policy=[POLICY_NAME]

​
Using Python

To remediate the issues mentioned in the previous response for GCP Compute using Python, you can use the following approaches:

  1. Enforce secure OS configurations:

    • Use the google-cloud-sdk library to programmatically configure OS-level security settings.
    • Write a Python script that utilizes the googleapiclient library to interact with the GCP Compute API and update the instance configurations.
    • Example script: 
      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'
zone = 'your-zone'
instance = 'your-instance-name'

request = compute.instances().setMetadata(
    project=project,
    zone=zone,
    instance=instance,
    body={
        'items': [
            {
                'key': 'startup-script',
                'value': '#!/bin/bash\n\n# Your startup script here'
            }
        ]
    }
)
response = request.execute()

  2. Implement network security controls:

    • Use the google-cloud-sdk library to programmatically configure network security settings.
    • Write a Python script that utilizes the googleapiclient library to interact with the GCP Compute API and update the firewall rules.
    • Example script: 
      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'
firewall_rule = 'your-firewall-rule-name'

request = compute.firewalls().update(
    project=project,
    firewall=firewall_rule,
    body={
        'allowed': [
            {
                'IPProtocol': 'tcp',
                'ports': ['22']
            }
        ]
    }
)
response = request.execute()

  3. Enable logging and monitoring:

    • Use the google-cloud-logging library to programmatically enable logging for GCP Compute instances.
    • Write a Python script that utilizes the googleapiclient library to interact with the GCP Compute API and enable monitoring for the instances.
    • Example script: 
      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'
instance = 'your-instance-name'

request = compute.instances().update(
    project=project,
    zone=zone,
    instance=instance,
    body={
        'name': instance,
        'labels': {
            'monitoring-enabled': 'true'
        }
    }
)
response = request.execute()

Please note that the provided scripts are just examples and may need to be modified based on your specific requirements and configurations.