performing-gcp-security-assessment-with-forseti

Performing comprehensive security assessments of Google Cloud Platform environments using Forseti Security, Security Command Center, and gcloud CLI to audit IAM policies, firewall rules, storage permissions, and compliance against CIS GCP Foundations Benchmark.

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name	performing-gcp-security-assessment-with-forseti
description	Performing comprehensive security assessments of Google Cloud Platform environments using Forseti Security, Security Command Center, and gcloud CLI to audit IAM policies, firewall rules, storage permissions, and compliance against CIS GCP Foundations Benchmark.
domain	cybersecurity
subdomain	cloud-security
tags	["cloud-security","gcp","forseti","security-command-center","iam-audit","cis-benchmark"]
version	1.0
author	mahipal
license	Apache-2.0
nist_ai_rmf	["MEASURE-2.7","MAP-5.1","MANAGE-2.4","GOVERN-1.1","GOVERN-4.2"]
atlas_techniques	["AML.T0070","AML.T0066","AML.T0082"]
nist_csf	["PR.IR-01","ID.AM-08","GV.SC-06","DE.CM-01"]
mitre_attack	["T1078.004","T1530","T1537","T1580"]

Performing GCP Security Assessment with Forseti

When to Use

When conducting periodic security assessments of GCP organizations and projects
When onboarding new GCP projects and establishing security baselines
When compliance mandates CIS GCP Foundations Benchmark evaluation
When auditing IAM bindings, firewall rules, and storage ACLs across multiple GCP projects
When building continuous security monitoring for GCP infrastructure

Do not use as a replacement for GCP Security Command Center Premium for real-time threat detection, for application-level vulnerability scanning (use Web Security Scanner), or for GKE-specific security (use GKE Security Posture).

Prerequisites

GCP Organization with Organization Admin or Security Admin IAM role
gcloud CLI authenticated with sufficient permissions (roles/securitycenter.admin, roles/iam.securityReviewer)
Security Command Center (SCC) enabled at the organization level
ScoutSuite installed for multi-cloud comparison (pip install scoutsuite)
Python 3.8+ for custom audit scripts using google-cloud-asset and google-cloud-securitycenter libraries

Workflow

Step 1: Enable Security Command Center and Asset Inventory

Enable SCC and set up Cloud Asset Inventory for comprehensive resource visibility.

# Enable Security Command Center API
gcloud services enable securitycenter.googleapis.com \
  --project=PROJECT_ID

# Enable Cloud Asset API
gcloud services enable cloudasset.googleapis.com \
  --project=PROJECT_ID

# List all assets in the organization
gcloud asset search-all-resources \
  --scope=organizations/ORG_ID \
  --asset-types="compute.googleapis.com/Instance,storage.googleapis.com/Bucket,iam.googleapis.com/ServiceAccount" \
  --format="table(name, assetType, location, project)"

# Export asset inventory to BigQuery for analysis
gcloud asset export \
  --organization=ORG_ID \
  --output-bigquery-force \
  --output-bigquery-dataset=projects/PROJECT_ID/datasets/asset_inventory \
  --output-bigquery-table=resources \
  --content-type=resource

Step 2: Audit IAM Policies and Bindings

Review IAM policies across the organization for overly permissive bindings, primitive roles, and service account misuse.

# List all IAM policy bindings at org level
gcloud organizations get-iam-policy ORG_ID \
  --format=json > org-iam-policy.json

# Find all users with Owner or Editor roles across projects
gcloud asset search-all-iam-policies \
  --scope=organizations/ORG_ID \
  --query="policy:roles/owner OR policy:roles/editor" \
  --format="table(resource, policy.bindings.role, policy.bindings.members)"

# Identify service accounts with admin roles
gcloud asset search-all-iam-policies \
  --scope=organizations/ORG_ID \
  --query="policy.bindings.members:serviceAccount AND policy:roles/owner" \
  --format=json

# Check for allUsers or allAuthenticatedUsers bindings (public access)
gcloud asset search-all-iam-policies \
  --scope=organizations/ORG_ID \
  --query="policy:allUsers OR policy:allAuthenticatedUsers" \
  --format="table(resource, policy.bindings.role, policy.bindings.members)"

# List service account keys older than 90 days
gcloud iam service-accounts keys list \
  --iam-account=SA_EMAIL \
  --managed-by=user \
  --format="table(name,validAfterTime,validBeforeTime)"

# List all firewall rules allowing ingress from 0.0.0.0/0
gcloud compute firewall-rules list \
  --filter="direction=INGRESS AND sourceRanges=0.0.0.0/0" \
  --format="table(name, network, allowed, sourceRanges, targetTags)"

# Find firewall rules allowing all protocols/ports
gcloud compute firewall-rules list \
  --filter="direction=INGRESS AND allowed[].IPProtocol=all" \
  --format="table(name, network, sourceRanges, targetTags)"

# Check for SSH (22) and RDP (3389) open to internet
gcloud compute firewall-rules list \
  --filter="direction=INGRESS AND sourceRanges=0.0.0.0/0 AND (allowed[].ports=22 OR allowed[].ports=3389)" \
  --format="table(name, network, allowed, sourceRanges)"

# Audit VPC flow log configuration
gcloud compute networks subnets list \
  --format="table(name, region, enableFlowLogs, logConfig.aggregationInterval)"

# List all buckets in a project
gsutil ls -p PROJECT_ID

# Check bucket IAM for public access
for bucket in $(gsutil ls -p PROJECT_ID); do
  echo "=== $bucket ==="
  gsutil iam get "$bucket" | grep -E "allUsers|allAuthenticatedUsers" && \
    echo "  WARNING: PUBLIC ACCESS DETECTED" || \
    echo "  OK: No public access"
done

# Check bucket encryption configuration
for bucket in $(gsutil ls -p PROJECT_ID); do
  echo "=== $bucket ==="
  gsutil kms encryption "$bucket" 2>/dev/null || echo "  Using Google-managed encryption"
done

# Check uniform bucket-level access enforcement
for bucket in $(gsutil ls -p PROJECT_ID); do
  gsutil uniformbucketlevelaccess get "$bucket"
done

# Run ScoutSuite against GCP
python3 -m ScoutSuite gcp \
  --user-account \
  --all-projects \
  --report-dir ./scoutsuite-gcp-report

# Run with service account credentials
python3 -m ScoutSuite gcp \
  --service-account /path/to/service-account-key.json \
  --all-projects \
  --report-dir ./scoutsuite-gcp-report

# Open the HTML report
open ./scoutsuite-gcp-report/gcp-report.html

# List active SCC findings
gcloud scc findings list ORG_ID \
  --filter="state=\"ACTIVE\" AND severity=\"CRITICAL\"" \
  --format="table(finding.category, finding.severity, finding.resourceName, finding.eventTime)"

# List findings by category
gcloud scc findings list ORG_ID \
  --filter="state=\"ACTIVE\" AND category=\"PUBLIC_BUCKET_ACL\"" \
  --format=json

# Get finding statistics grouped by category
gcloud scc findings group ORG_ID \
  --group-by="category" \
  --filter="state=\"ACTIVE\""

# List compliance violations from SCC
gcloud scc findings list ORG_ID \
  --filter="state=\"ACTIVE\" AND sourceProperties.compliance_standard=\"CIS\"" \
  --format="table(finding.category, finding.severity, finding.resourceName)"

Term	Definition
Security Command Center	GCP-native security and risk management platform that provides asset inventory, vulnerability detection, and threat monitoring
Forseti Security	Open-source GCP security toolkit (now deprecated in favor of SCC) that provided inventory, scanning, enforcement, and notification capabilities
Cloud Asset Inventory	GCP service that provides a complete inventory of cloud resources with metadata, IAM policies, and org policy configurations
CIS GCP Foundations Benchmark	Security best practice guidelines from Center for Internet Security specific to Google Cloud Platform configuration
Uniform Bucket-Level Access	GCP storage setting that disables legacy ACLs and enforces access exclusively through IAM policies for consistent access control
Organization Policy	GCP constraint-based governance mechanism that restricts resource configurations across the organization hierarchy

GCP Security Assessment Report
=================================
Organization: acme-acquired-org (ORG_ID: 123456789)
Projects Assessed: 34
Assessment Date: 2026-02-23
Standards: CIS GCP Foundations 2.0

IAM FINDINGS:
  Users with Owner role at org level:       3
  Service accounts with Editor role:        12
  Resources with allUsers binding:           5
  Service account keys > 90 days:           18

NETWORK FINDINGS:
  Firewall rules allowing 0.0.0.0/0:       14
  SSH open to internet:                      7
  RDP open to internet:                      2
  Subnets without VPC flow logs:            22

STORAGE FINDINGS:
  Publicly accessible buckets:               5
  Buckets without CMEK encryption:          28
  Buckets without uniform access:           15

CRITICAL FINDINGS: 12
HIGH FINDINGS: 34
MEDIUM FINDINGS: 78
LOW FINDINGS: 145

TOP REMEDIATION PRIORITIES:
  1. Remove allUsers bindings from 5 storage buckets (CRITICAL)
  2. Restrict 0.0.0.0/0 firewall rules to specific CIDRs (HIGH)
  3. Rotate 18 service account keys older than 90 days (HIGH)
  4. Enable VPC flow logs on 22 subnets (MEDIUM)