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🛡️ Google GCE Subnetwork Flow Logs are not enabled🟢

Logic​

Similar Policies​

Description​

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Description​

Flow Logs is a feature that enables you to capture information about the IP traffic going to and from network interfaces in the organization's VPC subnets. Once a flow log is created, you can view and retrieve its data in Cloud Logging. It is recommended that Flow Logs be enabled for every business-critical VPC subnet.

Rationale​

VPC networks and subnetworks not reserved for internal HTTP(S) load balancing provide logically isolated and secure network partitions where GCP resources can be launched. When Flow Logs are enabled for a subnet, VMs within that subnet start reporting on all Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) flows. Each VM samples the TCP and UDP flows it sees, inbound and outbound, whether the flow is to or from another VM, a host in the on-premises datacenter, a Google service, or a host on the Internet. If two GCP VMs are communicating, and both are in subnets that have VPC Flow Logs enabled, both VMs report the flows.

Flow Logs supports the following use cases:

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Remediation​

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Remediation​

From Google Cloud Console​

  1. Go to the VPC network GCP Console visiting https://console.cloud.google.com/networking/networks/list
  2. Click the name of a subnet, The Subnet details page displays.
  3. Click the EDIT button.
  4. Set Flow Logs to On.
  5. Expand the Configure Logs section.
  6. Set Aggregation Interval to 5 SEC.
  7. Check the box beside Include metadata.
  8. Set Sample rate to 100.
  9. Click Save.
Note​

It is not possible to configure a Log filter from the console.

From Google Cloud CLI​

To enable VPC Flow Logs for a network subnet, run the following command:

gcloud compute networks subnets update {{subnet-name}} \
    --region {{region}} \
    --enable-flow-logs \
    --logging-aggregation-interval=interval-5-sec \
    --logging-flow-sampling=1 \
    --logging-metadata=include-all

policy.yaml​

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Linked Framework Sections​

SectionSub SectionsInternal RulesPoliciesFlagsCompliance
💼 CIS GCP v1.2.0 → 💼 3.8 Ensure that VPC Flow Logs is enabled for every subnet in a VPC Network - Level 1 (Automated)1no data
💼 CIS GCP v1.3.0 → 💼 3.8 Ensure that VPC Flow Logs is Enabled for Every Subnet in a VPC Network - Level 1 (Automated)1no data
💼 CIS GCP v2.0.0 → 💼 3.8 Ensure that VPC Flow Logs is Enabled for Every Subnet in a VPC Network - Level 2 (Automated)1no data
💼 CIS GCP v3.0.0 → 💼 3.8 Ensure that VPC Flow Logs is Enabled for Every Subnet in a VPC Network - Level 2 (Automated)1no data
💼 Cloudaware Framework → 💼 Logging and Monitoring Configuration77no data
💼 FedRAMP High Security Controls → 💼 SI-4 System Monitoring (L)(M)(H)145062no data
💼 FedRAMP Low Security Controls → 💼 SI-4 System Monitoring (L)(M)(H)10no data
💼 FedRAMP Moderate Security Controls → 💼 SI-4 System Monitoring (L)(M)(H)713no data
💼 ISO/IEC 27001:2022 → 💼 8.15 Logging1834no data
💼 ISO/IEC 27001:2022 → 💼 8.16 Monitoring activities45no data
💼 NIST CSF v1.1 → 💼 DE.CM-1: The network is monitored to detect potential cybersecurity events1863no data
💼 NIST CSF v2.0 → 💼 DE.AE-02: Potentially adverse events are analyzed to better understand associated activities50no data
💼 NIST CSF v2.0 → 💼 DE.AE-03: Information is correlated from multiple sources65no data
💼 NIST CSF v2.0 → 💼 DE.CM-01: Networks and network services are monitored to find potentially adverse events180no data
💼 NIST CSF v2.0 → 💼 DE.CM-06: External service provider activities and services are monitored to find potentially adverse events50no data
💼 NIST CSF v2.0 → 💼 DE.CM-09: Computing hardware and software, runtime environments, and their data are monitored to find potentially adverse events181no data
💼 NIST CSF v2.0 → 💼 ID.IM-01: Improvements are identified from evaluations45no data
💼 NIST CSF v2.0 → 💼 ID.IM-02: Improvements are identified from security tests and exercises, including those done in coordination with suppliers and relevant third parties59no data
💼 NIST CSF v2.0 → 💼 ID.IM-03: Improvements are identified from execution of operational processes, procedures, and activities60no data
💼 NIST CSF v2.0 → 💼 ID.RA-01: Vulnerabilities in assets are identified, validated, and recorded46no data
💼 NIST CSF v2.0 → 💼 PR.DS-01: The confidentiality, integrity, and availability of data-at-rest are protected187no data
💼 NIST CSF v2.0 → 💼 PR.DS-02: The confidentiality, integrity, and availability of data-in-transit are protected160no data
💼 NIST CSF v2.0 → 💼 PR.DS-10: The confidentiality, integrity, and availability of data-in-use are protected184no data
💼 NIST SP 800-53 Revision 5 → 💼 SI-4 System Monitoring25117no data
💼 SOC 2 → 💼 CC7.2-1 Implements Detection Policies, Procedures, and Tools7no data
💼 SOC 2 → 💼 CC7.2-2 Designs Detection Measures7no data
💼 SOC 2 → 💼 CC7.2-3 Implements Filters to Analyze Anomalies918no data
💼 SOC 2 → 💼 CC7.2-4 Monitors Detection Tools for Effective Operation1no data