Cloud Infrastructure Security Audit Checklist [FREE PDF]

Cloud infrastructure security audits are essential for organizations subject to ISO/IEC 27001:2022, NIST Cybersecurity Framework, and PCI DSS v4.0 requirements, which mandate systematic controls over access, encryption, and network segmentation. Failure to maintain documented evidence of these controls can result in regulatory penalties, data breaches, and loss of certification status. This checklist provides a structured audit trail for IT Managers and CISOs to assess the security posture of cl

• Industry: Cloud Services
• Frequency: Quarterly
• Estimated Time: 60-90 minutes
• Role: CISO
• Total Items: 36
• Compliance: ISO/IEC 27001:2022 Annex A Controls A.8.20–A.8.23, NIST CSF v1.1 PR.AC, PR.DS, DE.CM, PCI DSS v4.0 Requirements 1, 7, 8, 10, SOC 2 Type II CC6.1, CC6.6, CC7.2, GDPR Article 32(1)(b) – Confidentiality & Integrity

Identity & Access Management (IAM)

Verify that user identities, roles, and access privileges are properly configured and follow least-privilege principles.

• Is multi-factor authentication (MFA) enforced for all privileged cloud accounts?
• Are IAM roles and permissions reviewed and aligned with least-privilege principles?
• Are service accounts and API keys rotated on a defined schedule?
• Are inactive or orphaned accounts identified and disabled within 90 days?
• Is a documented access review process conducted at least quarterly?

Data Encryption & Protection

Assess encryption controls for data at rest and in transit, including key management practices.

• Is all sensitive data encrypted at rest using AES-256 or equivalent?
• Is TLS 1.2 or higher enforced for all data in transit?
• Are encryption keys managed through a dedicated key management service (KMS)?
• Are encryption key rotation policies documented and enforced?
• Is data classification applied to identify and protect sensitive data assets?

Network Security & Segmentation

Review network architecture, firewall rules, and segmentation controls to minimize attack surface.

• Are cloud virtual networks (VPCs/VNets) logically segmented by environment (prod, dev, staging)?
• Are security group rules and network ACLs reviewed for overly permissive configurations?
• Is public internet access to management interfaces restricted or disabled?
• Is a Web Application Firewall (WAF) deployed for internet-facing applications?
• Are DDoS protection services enabled for critical cloud workloads?

Logging, Monitoring & Alerting

Confirm that comprehensive logging and real-time alerting mechanisms are operational and compliant.

• Are audit logs enabled for all cloud management plane activities (e.g., CloudTrail, Azure Activity Log)?
• Are logs stored in a tamper-evident, centralized log management system?
• Are log retention policies set to a minimum of 12 months with 3 months immediately available?
• Are automated alerts configured for suspicious activities such as privilege escalation or mass data export?
• Is a Security Information and Event Management (SIEM) system integrated with cloud log sources?

Vulnerability & Patch Management

Evaluate processes for identifying, prioritizing, and remediating vulnerabilities in cloud assets.

• Are automated vulnerability scans performed at least quarterly on all cloud infrastructure components?
• Are critical and high-severity vulnerabilities remediated within defined SLAs (e.g., 30 days)?
• Is a software composition analysis (SCA) tool used to identify vulnerable open-source dependencies?
• Are cloud provider security advisories and bulletins reviewed on a regular cadence?
• Is penetration testing conducted at least annually on critical cloud workloads?

Backup & Disaster Recovery

Assess backup integrity, recovery time objectives, and business continuity controls for cloud systems.

• Are automated backups configured and tested for all critical cloud data stores?
• Are backups stored in a geographically separate region or availability zone?
• Are Recovery Time Objective (RTO) and Recovery Point Objective (RPO) documented and validated?
• Has a disaster recovery test or failover exercise been completed within the last 12 months?
• Are backup access controls restricted to authorized personnel only?

Compliance Documentation & Governance

Verify that policies, evidence, and governance artifacts required for regulatory compliance are current and accessible.

• Is a cloud security policy documented, approved by leadership, and reviewed within the past year?
• Is a cloud asset inventory maintained and kept current with all active resources?
• Are third-party cloud provider security certifications (e.g., SOC 2, ISO 27001) verified and on file?
• Are data processing agreements (DPAs) in place with all cloud sub-processors handling personal data?
• Are audit findings from the previous period tracked to closure with documented remediation evidence?
• Are any open compliance gaps or exceptions documented with formal risk acceptance from leadership?

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Why Use This Cloud Infrastructure Security Audit Checklist [FREE PDF]?

This cloud infrastructure security audit checklist [free pdf] helps cloud services teams maintain compliance and operational excellence. Designed for ciso professionals, this checklist covers 36 critical inspection points across 7 sections. Recommended frequency: quarterly.

Ensures compliance with ISO/IEC 27001:2022 Annex A Controls A.8.20–A.8.23, NIST CSF v1.1 PR.AC, PR.DS, DE.CM, PCI DSS v4.0 Requirements 1, 7, 8, 10, SOC 2 Type II CC6.1, CC6.6, CC7.2, GDPR Article 32(1)(b) – Confidentiality & Integrity. Regulatory-aligned for audit readiness and inspection documentation.

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