Evidence Collection Skill — Deterministic PoC & Artifacts

Purpose

Preserve high-fidelity, auditable, and sanitized evidence for every security observation. Ensure that every reported finding has a deterministic, self-contained Proof-of-Concept (PoC) script that allows program triagers to reproduce the exact behavior in seconds.

Core Principle: "No PoC, No Finding"

A vulnerability is never finalized into a formal report unless it is backed by an unambiguous, working, and non-destructive Proof-of-Concept.

Workflow & Artifact Generation

1. Deterministic Python / Bash PoC Script

For every valid finding, create a self-contained reproduction script under /workspace/reports/evidence/<target>/<finding_id>/poc.py (or poc.sh):

#!/usr/bin/env python3
"""
Reproducible PoC for [Vulnerability Title]
Target: https://target.example.com
Author: Hermes Security Agent
"""
import requests

TARGET_URL = "https://target.example.com/api/v1/resource"
HEADERS = {
    "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36",
    "X-Test-Header": "PoC-Verification"
}

def verify_vulnerability():
    print(f"[*] Sending verification probe to {TARGET_URL}...")
    response = requests.get(TARGET_URL, headers=HEADERS, timeout=10)

    # Assert deterministic evidence condition
    if response.status_code == 200 and "root:" in response.text:
        print("[+] VULNERABILITY CONFIRMED: Deterministic indicator matched.")
        print(f"[+] Status: {response.status_code}, Response snippet: {response.text[:200]}")
        return True
    else:
        print("[-] Verification failed or indicator not observed.")
        return False

if __name__ == "__main__":
    verify_vulnerability()

2. Preserve Raw HTTP Request & Response

Store raw HTTP transactions in standard format:

POST /api/v1/user/profile HTTP/1.1
Host: target.example.com
Authorization: Bearer [REDACTED_TEST_TOKEN]
Content-Type: application/json

{"name": "test_user"}

HTTP/1.1 200 OK
Content-Type: application/json

{"status": "success", "id": 1234}

3. Visual Browser Evidence (Browser MCP)

When verifying client-side or UI vulnerabilities (DOM XSS, CSRF, sensitive page exposure), capture a screenshot via Browser MCP:

# Saved to: /workspace/reports/evidence/<target>/<finding_id>/screenshot.png

4. Sanitization & Zero False Positives

• Redact PII, customer secrets, and production credentials with [REDACTED].
• Confirm that the evidence does not rely on transient server blips or generic 404/500 error pages.

Evidence Directory Layout

/workspace/reports/evidence/<target>/<finding_id>/
├── poc.py                 # Self-contained executable reproduction script
├── poc_request.txt        # Full raw HTTP request
├── poc_response.txt       # Full raw HTTP response
├── screenshot.png         # Optional visual proof (for client-side/DOM flaws)
└── execution_log.txt      # Execution trace log