Designing Use-Case Based Penetration Tests
1.Introduction
Penetration Testing (Pentesting) has evolved from generic vulnerability scanning to a use-case driven, threat-informed approach. Modern applications—especially cloud-native, API-driven, and microservices-based—require structured testing methodologies aligned with real-world attack scenarios.
Frameworks such as MITRE ATT&CK and OWASP provide a foundation to design actionable use-cases that simulate adversarial behavior rather than just identifying surface-level vulnerabilities.
2. Why Structured Use-Cases Matter
Traditional pen testing often results in:
- Generic findings (e.g., missing headers, outdated libraries)
- Lack of business impact mapping
- Limited reproducibility
A use-case driven approach ensures:
- Alignment with real attacker tactics
- Contextual risk prioritization
- Better reporting for stakeholders
- Improved remediation tracking
3. Designing Structured Pen testing Use-Cases
A structured use-case should include the following components:
3.1 Use-Case Template
- Use-Case ID: UC-PT-001
- Objective: What attacker goal is being simulated
- Target Component: API / Web App / Infra
- Attack Vector: Entry point (login, API endpoint, upload feature)
- Technique Mapping: (e.g., MITRE technique ID)
- Preconditions: Authenticated / Unauthenticated / Role-based
- Steps: Execution flow
- Expected Outcome: Vulnerability or behavior
- Impact: Business/technical impact
- Detection Opportunities: Logs, alerts, SIEM correlation
3. 2 Categories of Use-Cases
- Authentication & Access Control
- Input Validation & Injection
- API Abuse & Logic Flaws
- Cloud Misconfiguration
- Privilege Escalation
- Data Exfiltration
- Client-Side Attacks
4. Execution Strategy
A structured pen testing lifecycle includes:
4. 1 Reconnaissance
- Asset discovery
- Endpoint enumeration
- Tech stack identification
4. 2 Threat Mapping
- Map components to MITRE ATT&CK
- Identify relevant adversary techniques
4. 3 Use-Case Execution
- Execute defined test cases systematically
- Capture evidence (requests, logs, screenshots)
4. 4 Validation & Exploitation
- Confirm exploitability
- Chain vulnerabilities where possible
4.5 Reporting
- Map findings to:
- Business impact
- Attack scenarios
- Risk severity (CVSS).
5. Use-Case Scenarios for Upcoming Applications
Below are practical, modern scenarios aligned with current application architectures:
Use-Case 1: Broken Object Level Authorization (BOLA) in APIs
- Scenario: User accesses another user’s data via manipulated API ID
- Target: REST API (/api/v1/user/{id})
- Technique: IDOR (OWASP API Top 10)
Steps:
- Authenticate as User A
- Capture API request
- Modify user ID to User B
- Replay request
Finding:
- Unauthorized data access
Impact:
- Sensitive data exposure (PII, financial data)
Use-Case 2: JWT Token Manipulation
- Scenario: Weak token validation allows privilege escalation
- Target: Authentication system
Steps:
- Decode JWT
- Modify role (user → admin)
- Re-sign (if weak/none algorithm)
- Replay token
Finding:
- Privilege escalation
Impact:
- Full system compromise
Use-Case 3: Business Logic Abuse in Payment Workflow
- Scenario: Manipulating payment flow to bypass charges
- Target: E-commerce checkout
Steps:
- Intercept payment request
- Modify amount parameter
- Skip payment verification API
Finding:
- Transaction bypass
Impact:
- Direct revenue loss
Use-Case 4: Cloud Storage Misconfiguration
- Scenario: Publicly accessible storage bucket
- Target: Cloud object storage
Steps:
- Enumerate bucket URLs
- Attempt unauthenticated access
- List/download files
Finding:
- Sensitive files exposed
Impact:
- Data leakage, compliance violations
Use-Case 5: SSRF in Microservices Architecture
- Scenario: Server-Side Request Forgery to access internal services
- Target: Backend API
Steps:
- Identify URL fetch functionality
- Inject internal IP (e.g., metadata service)
- Retrieve sensitive data
Finding:
- Internal system access
Impact:
- Credential exposure (cloud IAM roles)
Use-Case 6: Insecure File Upload Leading to RCE
- Scenario: Upload functionality allows malicious scripts
- Target: File upload endpoint
Steps:
- Upload web shell disguised as image
- Access uploaded file
- Execute commands
Finding:
- Remote Code Execution (RCE)
Impact:
- Full server compromise
Use-Case 7: Rate Limiting Bypass
- Scenario: Brute force attack due to missing controls
- Target: Login API
Steps:
- Automate login attempts
- Rotate IP or headers
- Identify valid credentials
Finding:
- Account takeover risk
6. Key Recommendations
- Integrate pentesting use-cases into CI/CD pipelines (DevSecOps)
- Align testing with:
- OWASP Top Ten
- OWASP API Security Top 10
- Use threat modeling to continuously evolve test cases
- Automate repeatable use-cases using tools/scripts
- Correlate findings with detection engineering (SIEM/SOC)
Conclusion
Structured use-case driven penetration testing transforms security assessments from checklist-based activities into adversary simulations. By aligning with frameworks like MITRE ATT&CK and focusing on real-world attack paths, organizations can significantly enhance their security posture, prioritize risks effectively, and build resilient applications.
