Cloud Penetration Testing

Cloud Penetration Testing is authorized security testing of cloud environments – AWS, Azure, GCP, or multi-cloud architectures – focused on identifying misconfigurations, exploitable weaknesses, and architectural flaws specific to cloud-native infrastructure. Unlike traditional network pentesting, cloud pentests must account for the shared responsibility modelShared Responsibility ModelDivision of security tasks between the cloud provider and the customer., provider-specific services, and the unique attack surfaces introduced by IAM, metadata services, serverless functions, and container orchestration.

Cloud environments shift the perimeter from network boundaries to identity and access management, making IAM the primary attack surface. A cloud pentest systematically tests this surface alongside storage exposure, compute vulnerabilities, and the sprawling web of interconnected cloud-native services.

Who commissions this test?

Cloud Penetration Tests are commissioned by CISOs, cloud architects, DevOps and platform engineering leads, and compliance teams. Organizations undergoing SOC 2, ISO 27001, or PCI DSS audits frequently require cloud-specific penetration testing as evidence of control effectiveness. Companies migrating to the cloud, adopting multi-cloud strategies, or operating cloud-native platforms with customer-facing workloads are typical clients.

Test objectives

The objective is to identify exploitable weaknesses in cloud infrastructure before attackers do. This includes validating IAM policy effectiveness, testing network segmentation within the cloud environment, assessing data exposure risk from storage services and APIs, evaluating the security of serverless and container workloads, and verifying that logging, monitoring, and alerting are sufficient to detect exploitation.

What is tested?

Testing covers the full range of cloud-specific attack surfaces: IAM – overly permissive policies, unused roles, cross-account role assumption chains, federation misconfigurations, and privilege escalation via cloud-native services (e.g., iam:PassRole + Lambda in AWS). Storage – public S3 buckets, Azure Blob containers, GCS objects, and missing encryption. Compute – EC2/VM metadata service exploitation (IMDS v1 SSRF to credential theft), containerContainer SecurityProtects container images, runtime environments, registries, and orchestration platforms. escape paths, Kubernetes RBAC misconfigurations. Serverless – LambdaLambda SecurityProtection of serverless functions, execution roles, event sources, and dependencies./Cloud Functions environment variable secrets, overprivileged execution roles, event injection. Networking – security group and firewall rule misconfigurations, VPC peering exposure, transit gateway trust relationships. Logging and monitoring – missing CloudTrail, Azure Activity Log, or GCP Audit Log coverage, disabled alerts.

Common findings

• Overly permissive IAM policies granting administrative access to service accounts
• Public S3 buckets or Azure Blob containers exposing sensitive data
• IMDS v1 enabled, allowing SSRF-to-credential-theft attack chains
• Misconfigured security groups permitting unrestricted inbound access
• Unused but active access keys and service account credentials
• Cross-account role assumption chains creating unintended trust paths
• Lambda environment variables containing plaintext secrets
• Missing or incomplete CloudTrail and audit logging configurations
• Unencrypted data at rest in storage and database services
• Privilege escalation via cloud-native service chaining (e.g., SSM, STS, or managed identity abuse)

Typical engagement workflow

A Cloud Penetration Test follows a structured engagement process adapted to the cloud context:

Interest and initial inquiry – the client initiates contact, often driven by compliance requirements, an upcoming cloud migration, or an architecture review. Initial scoping call – the testing provider meets with cloud architects and security leadership to understand the cloud footprint: providers in use, account structure, workload types, and compliance drivers. Proposal and approval – the provider delivers a proposal covering methodology, target accounts and services, timeline, and cost. The proposal addresses cloud provider pentest policies. Scope definition – both parties agree on target accounts, regions, services, and any exclusions (e.g., production databases, shared tenancy boundaries). Provider-specific testing policies are reviewed: AWS allows most testing without prior notification, Azure and GCP have their own rules. Letter of Engagement – formal authorization is signed, explicitly covering cloud-specific activities such as credential harvesting from metadata services and cross-account testing. Additional clearances – cloud provider notifications are submitted where required. Third-party SaaS integrations within scope may require separate authorization. Information provision – depending on the approach, the client provides account IDs, IAM policies, architecture diagrams, or read-only access credentials (gray-box), or provides nothing for black-box assessment. Kick-off call – the testing team, cloud architects, and security stakeholders align on timelines, emergency contacts, and the process for handling critical findings discovered during testing. Execution – the team tests systematically across IAM, storage, compute, serverless, and networking layers. Critical findings such as exposed data or credential leakage are reported immediately via the agreed escalation path. Vulnerability collection and assessment – all findings are documented with evidence, rated by severity and exploitability, and contextualized within the shared responsibility modelShared Responsibility ModelDivision of security tasks between the cloud provider and the customer.. Final report – a comprehensive report is produced including an executive summary, finding-by-finding detail with remediation guidance, and a prioritized roadmap for CSPMCloud Security Posture ManagementDetects misconfigurations and compliance deviations in cloud environments. improvements. Presentation – findings are presented to security and cloud engineering stakeholders. Project closure – retesting windows are agreed, and recommendations for ongoing posture management are documented.

Who should commission this test — and when?

Any organization running workloads in the cloud should commission cloud penetration testing. Critical timing includes before major cloud migrations, after significant architecture changes (new accounts, VPC restructuring, Kubernetes adoption), annually as part of compliance programs (SOC 2, ISO 27001, PCI DSS), and after security incidents involving cloud infrastructure. Organizations operating in regulated industries or handling sensitive customer data should treat cloud pentesting as a recurring baseline activity rather than a one-time assessment.

Related concepts

• Penetration TestingPenetration TestingAuthorized, methodical testing of a system for exploitable weaknesses, to find them before real attackers do.: Authorized testing of systems for exploitable weaknesses.
• Cloud Security Posture ManagementCloud Security Posture ManagementDetects misconfigurations and compliance deviations in cloud environments.: Continuous monitoring and enforcement of cloud security policies.
• Shared Responsibility ModelShared Responsibility ModelDivision of security tasks between the cloud provider and the customer.: The division of security responsibilities between cloud provider and customer.
• Hybrid Cloud SecurityHybrid Cloud SecurityProtects integrated on-premises, private cloud, and public cloud environments.: Security considerations spanning on-premises and cloud environments.
• Lambda SecurityLambda SecurityProtection of serverless functions, execution roles, event sources, and dependencies.: Security of serverless function execution environments.
• Container SecurityContainer SecurityProtects container images, runtime environments, registries, and orchestration platforms.: Securing containerized workloads and orchestration platforms.