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📝 Google Logging Log Metric Filter and Alerts for VPC Network Route Changes do not exist 🟢

  • Contextual name: 📝 Log Metric Filter and Alerts for VPC Network Route Changes do not exist 🟢
  • ID: /ce/ca/google/logging/vpc-network-route-changes-monitoring
  • Located in: 📁 Google Logging

Flags​

Our Metadata​

  • Policy Type: COMPLIANCE_POLICY
  • Policy Category:
    • SECURITY

Similar Policies​

Logic​

Description​

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Description​

It is recommended that a metric filter and alarm be established for Virtual Private Cloud (VPC) network route changes.

Rationale​

Google Cloud Platform (GCP) routes define the paths network traffic takes from a VM instance to another destination. The other destination can be inside the organization VPC network (such as another VM) or outside of it. Every route consists of a destination and a next hop. Traffic whose destination IP is within the destination range is sent to the next hop for delivery.

Monitoring changes to route tables will help ensure that all VPC traffic flows through an expected path.

Impact​

Enabling of logging may result in your project being charged for the additional logs usage. These charges could be significant depending on the size of the organization.

Audit​

From Google Cloud Console​

Ensure that the prescribed Log metric is present:

  1. Go to Logging/Logs-based Metrics by visiting https://console.cloud.google.com/logs/metrics.
  2. In the User-defined Metrics section, ensure that at least one metric <Log_Metric_Name> is present with the filter text:

... see more

Remediation​

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Remediation​

From Google Cloud Console​

Create the prescribed Log Metric:

  1. Go to Logging/Logs-based Metrics by visiting https://console.cloud.google.com/logs/metrics and click "CREATE METRIC".

  2. Click the down arrow symbol on the Filter Bar at the rightmost corner and select Convert to Advanced Filter

  3. Clear any text and add:

     resource.type="gce_route" 
     AND (protoPayload.methodName:"compute.routes.delete" 
     OR protoPayload.methodName:"compute.routes.insert")

  4. Click Submit Filter. Display logs appear based on the filter text entered by the user.

  5. In the Metric Editor menu on the right, fill out the name field. Set Units to 1 (default) and Type to Counter. This ensures that the log metric counts the number of log entries matching the user's advanced logs query.

  6. Click Create Metric.

Create the prescribed alert policy:

  1. Identify the newly created metric under the section User-defined Metrics at https://console.cloud.google.com/logs/metrics.
  2. Click the 3-dot icon in the rightmost column for the new metric and select Create alert from Metric. A new page displays.

... see more

policy.yaml​

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Linked Framework Sections​

SectionSub SectionsInternal RulesPoliciesFlags
💼 CIS GCP v3.0.0 → 💼 2.8 Ensure That the Log Metric Filter and Alerts Exist for VPC Network Route Changes - Level 2 (Automated)1
💼 Cloudaware Framework → 💼 Logging and Monitoring Configuration49