Essential skills

Essential Skills — Deep Dive

Deep-Dive Lab Playbook — Every PortSwigger lab variant with exact payloads, bypass techniques, and zero-day extensions. 🟢 Apprentice 🟡 Practitioner 🔴 Expert

When to Use

• BSCP certification prep
• Real-world bug bounty hunting
• Building exploitation chains

Prerequisites

• Burp Suite Professional
• Browser with proxy configured

Workflow

Phase 1: Reconnaissance

• Identify input vectors, parameters, and application behavior.

Phase 2: Exploitation

• Apply standard lab payloads.

Phase 3: Zero-Day Escalation

• Fuzz filters, bypass WAFs, and chain with other vulns.

Lab Playbooks

Lab 1: Discovering vulnerabilities quickly with targeted scanning 🟡 PRACTITIONER

Use Burp Scanner's "Scan defined insertion points" feature on specific parameters rather than running a full crawl-and-scan which takes too long. Send a single request to Intruder or Scanner and only select the specific parameter (e.g., inside an XML node) to scan for vulnerabilities like XXE or SQLi.

Zero-day tip: Targeted scanning minimizes noise and risk of burning accounts compared to full automated scans.

Lab 2: Scanning non-standard data structures 🟡 PRACTITIONER

When dealing with custom or non-standard data (like a bespoke binary format or deep JSON encoding), use Burp extensions like JSON Web Tokens (JWT) or build a custom BApp. If standard insertion points don't work, use the "Bypass WAF" or "Hackvertor" extensions to auto-encode scanner payloads before they leave Burp.

Zero-day tip: Often, applications correctly sanitize standard form-data but fail to apply the same sanitization logic to Base64-encoded or custom-delimited data structures.

Key Concepts

Concept	Description
PortSwigger Vectors	Standardized approaches to vulnerability classes.
Payload Encoding	Modifying payloads to bypass basic string matching WAFs.

Output Format

Vulnerability Deep-Dive Report
==============================
Target Vector: [Endpoint]
Bypass Technique: [Explanation of bypass]
Payload Used: [Payload]
Impact Explanation: [Impact]

🔵 Blue Team

• Deploy robust WAF rules to detect anomalies.
• Monitor logs for unusual access patterns.

🛡️ Remediation & Mitigation Strategy

• Input Validation: Sanitize and strictly type-check all inputs.
• Least Privilege: Constrain component execution bounds.

📚 Shared Resources

For cross-cutting methodology applicable to all vulnerability classes, see:

• _shared/references/elite-chaining-strategy.md — Exploit chaining methodology and high-payout chain patterns
• _shared/references/elite-report-writing.md — HackerOne-optimized report writing, CWE quick reference
• _shared/references/real-world-bounties.md — Verified disclosed bounties by vulnerability class

References

• PortSwigger Labs