🔌 Sherlocked Security – API Penetration Testing

Secure Your APIs to Protect Your Data and Business Logic

📄 1. Statement of Work (SOW)

Service Name: API Penetration Testing
Client Type: SaaS, FinTech, HealthTech, eCommerce, Platforms
Service Model: Manual + Automated Security Testing
Compliance Coverage: OWASP API Top 10, OWASP ASVS, PCI-DSS, ISO 27001, HIPAA, GDPR
Testing Types:

Black Box (Only endpoint access)
Gray Box (Access with API keys/docs)
White Box (Code/repo access – optional)

🧠 2. Our Approach

🔹 Business Logic Driven
🔹 Auth & Token Flow Analysis
🔹 Focused on Abuse & Data Leakage

[Discovery] → [Endpoint Enumeration] → [Authentication Testing] → [Authorization Bypass] → [Input Validation Testing] → [Business Logic Abuse] → [Risk Mapping] → [Reporting & Retesting]

🧪 3. Methodology

[Kickoff & Scope Setup] → [API Documentation Review] → [Endpoint Fuzzing] → [Auth Flow Testing] → [Access Control Checks] → [Data Exposure Testing] → [Rate Limiting & DoS] → [Risk Categorization] → [Retest & Final Signoff]

📦 4. Deliverables to the Client

✅ Vulnerability Matrix (with OWASP API Top 10 mapping)
🧾 Statement of Work (SOW)
📘 Technical Report including:
- Vulnerability Summary
- Risk Severity (CVSS v3.1)
- Root Cause & PoC
- Exploitation Steps
- Remediation Guidance
- Reference Links
📊 API Attack Diagrams & Flow Maps
📽️ Walkthrough Session with Developers (optional)
🧑‍💻 Dev Support (Slack/Teams channel optional)
🔁 One Free Retest Round
🎓 Security Certificate (Post Fix Validation)

🤝 5. What We Need from You (Client Requirements)

✅ API Documentation (Swagger/OpenAPI/Postman)
✅ Environment URLs (Staging/Dev/Prod)
✅ Credentials (if Gray Box)
✅ Auth mechanism details (OAuth, JWT, SSO, MFA)
✅ Rate limits/WAF setup info
✅ Developer POC for testing windows
✅ IP whitelisting if needed

🧰 6. Tools & Technology Stack

🔍 Postman / Insomnia
🧪 Burp Suite Pro + API plugins
📂 OWASP ZAP (API mode)
🔬 Nuclei (API templates)
📌 Fuzzer & payload injectors
🛡️ JWT Toolkit & Token Exploiters
🔐 Custom Scripts (BOLA, Mass Assignment)
🧠 AI-driven endpoint analyzers

🚀 7. Engagement Lifecycle (Lead → Closure)

1. Discovery Call 2. Scope & Access Review 3. SoW + NDA + Proposal 4. Testing Phase (1 Week Typical) 5. Draft Report Delivery 6. Developer Review Call 7. Final Report + Retest 8. Security Certificate & Closure

🌟 8. Why Sherlocked Security? (Our USP)

Feature	Sherlocked Advantage
🔌 Deep API Testing	Covers OWASP API Top 10 & Business Logic
🧠 Auth & Token Flows	Test for token leakage, misuse & replay
📘 Dev-Centric Reporting	CVSS scoring + reproducible PoCs
🔁 Free Revalidation	1 round of retest included
💬 Real-Time Support	Slack/Teams for dev queries
🎓 Security Certificate	Issued post secure fix verification

📚 9. Real-World Case Studies

🔓 BOLA in FinTech Wallet API

Issue: Missing object-level access checks on /transactions/:id
Impact: Cross-user transaction viewing & tampering
Fix: Implemented ownership checks at object level

🧪 Mass Assignment in HR API

Client: HRMS SaaS Startup
Findings:

User role override via JSON key injection
Lack of input whitelisting

Outcome:

Rapid remediation with Sherlocked assistance
Cleared SOC 2 & internal security audit

🛡️ 10. SOP – Standard Operating Procedure

Kickoff Call & Scope Finalization
API access setup & documentation collection
Authentication testing
Role-based access control validation
Input fuzzing & injection testing
Business logic abuse scenarios
Rate-limiting, DoS checks
Draft report delivery
Final report + fix support
Retest & Certification

📋 11. API Security Checklist (Preview)

Enumerate all available endpoints and methods.
Test authentication and authorization mechanisms.
Assess for injection vulnerabilities.
Verify proper use of HTTP methods.
Check rate limiting and brute-force protections.
Test for sensitive data exposure.
Evaluate error handling and information leakage.
Validate input and output parameters.
Analyze endpoint access control logic.
Perform fuzz testing for unexpected input.

📬 Contact Us or 📅 Book a Consultation

API Penetration Testing