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Essential Skills — Deep Dive

PortSwigger deep-dive with exact payloads for every lab variant including zero-day techniques

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SKILL.md (original)

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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

ConceptDescription
PortSwigger VectorsStandardized approaches to vulnerability classes.
Payload EncodingModifying 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:

References

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