compliance-cis-cloud

| | CIS Benchmark | Prescriptive security configuration guidelines developed by the Center for Internet Security through community consensus | | Level 1 Profile | Practical security controls implementable without significant performance or functionality impact, representing security hygiene | | Level 2 Profile | Defense-in-depth controls that may restrict functionality and require careful planning before implementation | | Foundations Benchmark | CIS benchmark specifically for cloud providers covering IAM, logging, monitoring, networking, and storage security | | Control ID | Unique numerical identifier for each CIS recommendation (e.g., 1.4 for root access key checks, 2.1.1 for S3 encryption) | | Compliance Score | Percentage of CIS controls in a passing state, tracked over time to measure security posture improvement | | Automated Assessment | Tool-driven evaluation of CIS controls using cloud provider APIs to check resource configurations against benchmark requirements | | Remediation Runbook | Documented step-by-step procedure for fixing a specific failed CIS control, including pre-checks and validation |

Tools & Systems

• Prowler: Open-source cloud security tool performing 300+ checks including CIS benchmark assessments for AWS, Azure, and GCP
• ScoutSuite: Multi-cloud security auditing tool with CIS benchmark rule sets generating HTML reports
• AWS Security Hub: Native AWS service supporting CIS AWS Foundations Benchmark as a security standard
• Azure Policy: Governance service with built-in CIS benchmark policy initiatives for automated compliance monitoring
• GCP Security Command Center: Native GCP service evaluating configurations against CIS GCP Foundations Benchmark

Common Scenarios

Scenario: Pre-Audit CIS Assessment for SOC 2 Certification

Context: A SaaS company pursuing SOC 2 Type II certification needs to demonstrate cloud security controls aligned to CIS benchmarks. The auditor requires evidence of continuous compliance monitoring across 45 AWS accounts.

Approach:

1. Run Prowler CIS v5.0 assessment across all 45 accounts to establish the baseline compliance score
2. Export results to CSV and categorize failures by section (IAM, Logging, Monitoring, Networking)
3. Map each CIS control to the relevant SOC 2 Trust Services Criteria (CC6.1, CC6.6, CC7.1, etc.)
4. Remediate all Level 1 control failures within 30 days and Level 2 within 60 days
5. Enable CIS v5.0 in AWS Security Hub for continuous monitoring and automated drift detection
6. Generate weekly compliance reports showing improvement trajectory for the auditor
7. Document exceptions for controls intentionally not implemented with risk acceptance justification

Pitfalls: Remediating controls without testing in a staging environment first can break production workloads. Ignoring Level 2 controls entirely weakens the audit narrative even if they are not strictly required.

Output Format

CIS Benchmark Audit Report
============================
Cloud Provider: AWS
Benchmark Version: CIS AWS Foundations Benchmark v5.0
Accounts Assessed: 45
Assessment Date: 2025-02-23
Tool: Prowler v4.3.0

OVERALL COMPLIANCE SCORE: 74%

COMPLIANCE BY SECTION:
  1. Identity and Access Management:  68% (41/60 controls passed)
  2. Storage:                         82% (28/34 controls passed)
  3. Logging:                         91% (20/22 controls passed)
  4. Monitoring:                      55% (18/33 controls passed)
  5. Networking:                      78% (32/41 controls passed)

TOP FAILED CONTROLS (by affected accounts):
  [1.4]   Root account has active access keys           - 3/45 accounts
  [1.5]   MFA not enabled for root account              - 2/45 accounts
  [2.1.1] S3 default encryption not enabled             - 12/45 accounts
  [3.1]   CloudTrail not multi-region                   - 8/45 accounts
  [4.3]   No alarm for root account usage               - 28/45 accounts
  [5.1]   VPC flow logs not enabled                     - 15/45 accounts
  [5.4]   Security groups allow 0.0.0.0/0 ingress      - 22/45 accounts

REMEDIATION PRIORITY:
  Critical (Fix within 7 days):  Root access keys, missing root MFA
  High (Fix within 30 days):     S3 encryption, CloudTrail, VPC flow logs
  Medium (Fix within 60 days):   CloudWatch alarms, security group restrictions
  Low (Fix within 90 days):      Level 2 controls, informational items