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Event Information

  • The v1.compute.backendBuckets.setEdgeSecurityPolicy event in GCP for Compute refers to the action of setting the edge security policy for a backend bucket.
  • This event occurs when a user or an automated process updates the edge security policy configuration for a backend bucket in GCP Compute Engine.
  • The edge security policy determines how requests to the backend bucket are handled at the edge locations of Google’s global network, providing additional security and control over the traffic.

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Examples

  • Unauthorized access: If security is impacted with v1.compute.backendBuckets.setEdgeSecurityPolicy in GCP for Compute, it could potentially allow unauthorized access to backend buckets. This means that an attacker could gain access to sensitive data stored in the buckets, leading to data breaches and potential loss of confidential information.
  • Data leakage: Another impact on security could be data leakage. If the edge security policy is not properly configured, it may allow unauthorized users to access and download data from backend buckets. This could result in the exposure of sensitive information to unauthorized parties, leading to reputational damage and potential legal consequences.
  • Denial of Service (DoS) attacks: Improper configuration of the edge security policy could also make the backend buckets vulnerable to DoS attacks. Attackers could exploit this vulnerability to overload the backend infrastructure, causing service disruptions and impacting the availability of the application or service relying on the backend buckets. This could result in financial losses and damage to the organization’s reputation.

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Remediation

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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 project’s IAM policies.
    • Review the existing IAM policies and identify any potential issues or misconfigurations.
    • Make necessary changes to the IAM policies to align with best practices (e.g., removing unnecessary roles, granting least privilege).
    • Regularly monitor and audit the IAM policies to ensure compliance with security requirements.
Note: The above instructions provide a general guideline for remediating the mentioned issues in GCP Compute using the GCP console. The specific steps may vary depending on your specific environment and requirements.

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Using CLI

To remediate the issues mentioned in the previous response for GCP Compute using GCP CLI, you can follow these steps:
  1. Disable SSH access for the default service account:
    • Use the following command to get the email address of the default service account: 
      gcloud iam service-accounts list --filter="displayName:Compute Engine default service account"
    • Once you have the email address, use the following command to remove the roles associated with SSH access: 
      gcloud projects remove-iam-policy-binding PROJECT_ID --member=serviceAccount:EMAIL_ADDRESS --role=roles/compute.osLogin
  2. Enable VPC Flow Logs for network monitoring:
    • Use the following command to enable VPC Flow Logs for a specific subnet: 
      gcloud compute networks subnets update SUBNET_NAME --region=REGION --enable-flow-logs
  3. Restrict public access to Cloud Storage buckets:
    • Use the following command to update the bucket ACL and remove all public access: 
      gsutil iam ch allUsers:legacyObjectReader gs://BUCKET_NAME
Note: Replace PROJECT_ID with your GCP project ID, EMAIL_ADDRESS with the email address of the default service account, SUBNET_NAME with the name of the subnet, REGION with the region where the subnet is located, and BUCKET_NAME with the name of the Cloud Storage bucket.

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Using Python

To remediate the issues mentioned in the previous response for GCP Compute using Python, you can use the following approaches:
  1. Enforce strong passwords:
    • Use the Google Cloud Identity and Access Management (IAM) API to create a custom role with the necessary permissions to manage user accounts.
    • Write a Python script that utilizes the IAM API to enforce strong password policies for GCP Compute instances.
    • The script should iterate through all the instances and update the passwords for the user accounts based on the defined policy.
  2. Enable disk encryption:
    • Use the Google Cloud Key Management Service (KMS) API to create a key ring and a key for encrypting the disks.
    • Write a Python script that utilizes the Compute Engine API to enable disk encryption for all the Compute instances.
    • The script should iterate through all the instances and enable disk encryption by attaching the created key to the instance’s disks.
  3. Implement network security groups:
    • Use the Google Cloud Firewall API to create network security groups (firewall rules) that restrict inbound and outbound traffic.
    • Write a Python script that utilizes the Firewall API to implement network security groups for the Compute instances.
    • The script should iterate through all the instances and apply the necessary firewall rules to restrict traffic based on the defined policies.
Please note that the provided scripts are just high-level examples, and you may need to modify them based on your specific requirements and environment setup.