Cloud Penetration Testing Methodology: Testing AWS, Azure, and GCP Environments

Cloud Testing Is Not Network Testing

Cloud penetration testing follows the same goal as any other assessment — prove what an attacker could achieve — but the methodology is different. In the cloud, most compromise comes not from unpatched software but from misconfiguration and identity: an overly permissive role, a public storage bucket, an exposed secret. Effective cloud testing therefore blends configuration review with active exploitation. This article walks through the methodology behind a cloud penetration test across AWS, Azure, and GCP.

Phase 1: Scoping and the Shared Responsibility Model

Cloud scoping starts with a crucial distinction: the shared responsibility model. The provider secures the underlying infrastructure; the customer is responsible for configuration, identity, data, and access. A cloud penetration test focuses on the customer’s side of that line. Scoping defines which accounts, subscriptions, or projects are in scope, what level of access the tester is granted (from anonymous external through to an authenticated low-privilege identity), and which provider policies must be respected.

Phase 2: Configuration Review

The tester reviews the environment’s configuration against cloud security best practices and provider benchmarks (such as the CIS Benchmarks). This covers identity and access management policies, storage permissions, network controls such as security groups and firewall rules, logging and monitoring coverage, encryption settings, and exposed management surfaces. Misconfigurations identified here become the candidates for the active testing that follows.

Phase 3: Identity and Access Attacks

Identity is the new perimeter in the cloud, so this phase is central. The tester examines how identities are granted and used:

• Over-permissioned roles and policies — identities with far more access than they need.
• Exposed credentials and secrets — keys and tokens leaked in code, metadata, or storage.
• Weak or missing MFA on privileged identities.
• Trust and federation issues between accounts, tenants, or external providers.

These weaknesses are the cloud equivalent of weak passwords on an internal network — the most reliable route to escalation.

Phase 4: Privilege Escalation

Using an initial identity, the tester attempts to escalate privileges within the cloud environment — abusing permissive policies, role-assumption paths, and service misconfigurations to gain broader control. Cloud privilege escalation often follows non-obvious chains (one service granting access to another), and mapping these paths is where deep cloud expertise matters most.

Phase 5: Lateral Movement and Data Exposure

With elevated privileges, the tester demonstrates how an attacker would move through the environment and reach sensitive data — accessing storage, databases, secrets managers, and compute workloads. Where the environment includes serverless functions and containers, those are assessed too, since they frequently run with broad permissions and represent a fast path to escalation. The goal is to show, concretely, what data and systems a realistic attacker could reach.

Phase 6: Impact and Reporting

The tester documents the realistic impact — what was accessible, what could have been disrupted, and how the chain unfolded — within agreed limits. The report includes an executive summary, technical findings with severity and reproduction steps mapped back to specific cloud resources and IAM principals, evidence, and prioritized remediation. Because cloud findings are configuration-driven, remediation guidance is usually concrete and quick to apply once it is clearly identified.

From Methodology to Engagement

A strong cloud methodology turns a sprawling, configuration-heavy environment into a clear picture of real risk. Learn more about our cloud penetration testing service, or see how cloud testing fits alongside external and internal network testing for organizations running hybrid infrastructure. To scope an engagement, contact us.