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Event Information

  • The v1.compute.targetHttpProxies.setUrlMap event in GCP for Compute refers to an event where the URL map is set for a target HTTP proxy.
  • This event is triggered when the URL map configuration is updated for a specific target HTTP proxy in GCP Compute Engine.
  • The URL map determines how incoming HTTP requests are routed to backend services based on the requested URL path.

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Examples

  1. Unauthorized access: If security is impacted with v1.compute.targetHttpProxies.setUrlMap in GCP for Compute, it could potentially allow unauthorized access to sensitive resources. For example, if an attacker gains access to modify the URL map associated with a target HTTP proxy, they could redirect traffic to a malicious website or intercept sensitive data.

  2. Denial of Service (DoS) attacks: A security impact of v1.compute.targetHttpProxies.setUrlMap in GCP for Compute could be the potential for DoS attacks. By modifying the URL map, an attacker could redirect a large volume of traffic to a specific backend service, overwhelming its resources and causing a denial of service for legitimate users.

  3. Data leakage: Another security concern with v1.compute.targetHttpProxies.setUrlMap in GCP for Compute is the potential for data leakage. If an unauthorized user modifies the URL map to redirect traffic to a different backend service, they may gain access to sensitive data that was not intended for them, leading to a data breach or leakage of confidential information.

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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 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 users or groups.
    • Regularly review and audit the IAM roles and permissions to ensure they align with the organization’s security requirements.

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Using CLI

  1. Enable VPC Flow Logs for GCP Compute instances:

    • Use the gcloud compute instances update command to enable VPC Flow Logs for a specific instance: 
      gcloud compute instances update INSTANCE_NAME --enable-network-endpoint-logging

  2. Restrict SSH access to GCP Compute instances:

    • Use the gcloud compute firewall-rules update command to update the firewall rule for SSH access: 
      gcloud compute firewall-rules update FIREWALL_RULE_NAME --source-ranges=IP_RANGE --allow=tcp:22

  3. Implement disk encryption for GCP Compute instances:

    • Use the gcloud compute disks create command to create an encrypted disk: 
      gcloud compute disks create DISK_NAME --size=SIZE --type=DISK_TYPE --encryption-key=KEY_NAME

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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 secure OS configurations:

    • Use the google-cloud-sdk library to interact with GCP Compute API.
    • Write a Python script to retrieve the list of instances in a project using the instances().list() method.
    • Iterate through the instances and check their OS configurations using the instances().get() method.
    • Implement checks for secure configurations such as disabling root SSH access, enforcing strong passwords, and enabling automatic security updates.
    • Use the instances().setMetadata() method to update the instance metadata with the desired configurations.

  2. Implement network security controls:

    • Use the google-cloud-sdk library to interact with GCP Compute API.
    • Write a Python script to retrieve the list of firewall rules in a project using the firewalls().list() method.
    • Iterate through the firewall rules and check for any insecure configurations such as allowing unrestricted access or using weak protocols.
    • Use the firewalls().update() method to modify the firewall rules and enforce secure configurations.

  3. Monitor and respond to security events:

    • Use the google-cloud-sdk library to interact with GCP Security Command Center API.
    • Write a Python script to retrieve security findings using the organizations().sources().findings().list() method.
    • Implement logic to filter and analyze the findings based on severity levels and specific event types.
    • Use the organizations().sources().findings().update() method to acknowledge or mitigate the security findings.

Please note that the provided code snippets are simplified examples, and you may need to modify them based on your specific requirements and the structure of your GCP environment.