| name | auditing-cloud-with-cis-benchmarks |
| description | This skill details how to conduct cloud security audits using Center for Internet Security benchmarks for AWS, Azure, and GCP. It covers interpreting CIS Foundations Benchmark controls, running automated assessments with tools like Prowler and ScoutSuite, remediating failed controls, and maintaining continuous compliance monitoring against CIS v5 for AWS, v4 for Azure, and v4 for GCP.
|
| domain | cybersecurity |
| subdomain | cloud-security |
| tags | ["cis-benchmarks","cloud-audit","compliance-assessment","prowler","security-hardening"] |
| version | 1.0.0 |
| author | mahipal |
| license | Apache-2.0 |
| nist_ai_rmf | ["GOVERN-1.1","GOVERN-4.2","MAP-2.3"] |
| nist_csf | ["PR.IR-01","ID.AM-08","GV.SC-06","DE.CM-01"] |
Auditing Cloud with CIS Benchmarks
When to Use
- When performing initial security audits of cloud environments against industry-standard benchmarks
- When preparing for SOC 2, ISO 27001, or regulatory audits that reference CIS controls
- When establishing a measurable security baseline for new cloud accounts or subscriptions
- When tracking compliance improvement over time with periodic reassessment
- When evaluating the security posture of acquired or inherited cloud environments
Do not use for runtime threat detection (see detecting-cloud-threats-with-guardduty), for application-level security testing (see conducting-cloud-penetration-testing), or for compliance frameworks not based on CIS (refer to specific regulatory skill files).
Prerequisites
- Read-only access to target cloud accounts (AWS SecurityAudit policy, Azure Reader role, GCP Viewer role)
- Prowler, ScoutSuite, or cloud-native CSPM tools installed and configured
- Understanding of CIS benchmark structure: sections, controls, profiles (Level 1 and Level 2)
- Remediation access for implementing fixes (separate from audit credentials)
Workflow
Step 1: Select Appropriate CIS Benchmark Version
Choose the correct benchmark version for each cloud provider. Current versions as of 2025 include CIS AWS Foundations Benchmark v5.0, CIS Azure Foundations Benchmark v4.0, and CIS GCP Foundations Benchmark v4.0.
CIS Benchmark Coverage Areas:
+-------------------+-------------------------+------------------------+
| Section | AWS v5.0 | Azure v4.0 |
+-------------------+-------------------------+------------------------+
| Identity & Access | IAM policies, MFA, root | Azure AD, RBAC, PIM |
| Logging | CloudTrail, Config | Activity Log, Diag |
| Monitoring | CloudWatch alarms | Defender, Sentinel |
| Networking | VPC, SG, NACLs | NSG, ASG, Firewall |
| Storage | S3 encryption, access | Storage encryption |
| Database | RDS encryption | SQL TDE, auditing |
+-------------------+-------------------------+------------------------+
CIS Profile Levels:
Level 1: Practical security settings that can be implemented without significant
performance impact or reduced functionality
Level 2: Defense-in-depth settings that may reduce functionality or require
additional planning for implementation
Step 2: Run Automated Assessment with Prowler
Execute comprehensive CIS benchmark scans using Prowler for automated control evaluation across AWS, Azure, and GCP.
prowler aws \
--compliance cis_5.0_aws \
--profile audit-account \
--output-formats json-ocsf,html,csv \
--output-directory ./cis-audit-$( +%Y%m%d)
prowler azure \
--compliance cis_4.0_azure \
--subscription-ids \
--output-formats json-ocsf,html,csv \
--output-directory ./cis-audit-azure-$( +%Y%m%d)
prowler gcp \
--compliance cis_4.0_gcp \
--project-ids \
--output-formats json-ocsf,html,csv \
--output-directory ./cis-audit-gcp-$( +%Y%m%d)
scout suite aws \
--profile audit-account \
--report-dir ./scout-report \
--ruleset cis-5.0 \
--force
