Create test5.html - #27

Security scan completed successfully

🔐 Hacktron Security Analysis

Overview

This PR introduces a postMessage demonstration that contains critical security vulnerabilities. The implementation lacks proper origin validation and uses unsafe DOM manipulation techniques.

🚨 Attack Flow Diagram

sequenceDiagram
    participant Attacker
    participant VictimPage as Victim Page (test5.html)
    participant DOM
    
    Attacker->>VictimPage: postMessage(malicious_payload, "*")
    Note over Attacker,VictimPage: No origin restriction!
    
    VictimPage->>VictimPage: addEventListener("message")
    Note over VictimPage: No origin validation ❌
    
    VictimPage->>DOM: innerHTML = event.data
    Note over VictimPage,DOM: Unsafe assignment ❌
    
    DOM->>DOM: Execute malicious script
    Note over DOM: XSS triggered! 🚨
    
    DOM-->>Attacker: Steal cookies/tokens

📋 What This PR Does

• Demonstrates cross-origin communication using postMessage API
• Shows message passing between parent and child windows
• ⚠️ Contains intentional security flaws for educational purposes

🔍 Security Issues Found

1. Critical: DOM-based XSS vulnerability via innerHTML
2. High: Unrestricted targetOrigin in postMessage sender
3. Medium: Missing origin validation in message receiver

🛠️ Technical Details

File: test5.html

Vulnerable Code Patterns:

• Line 30: innerHTML = event.data (XSS vector)
• Line 28: No event.origin validation
• Line 45: postMessage(message, "*") (wildcard origin)

⚡ Impact Assessment

• Confidentiality: HIGH - Attacker can steal sensitive data
• Integrity: HIGH - Attacker can modify page content
• Availability: MEDIUM - Potential for DoS via malicious messages

🔒 Recommended Actions

1. Add origin validation in message handler
2. Replace innerHTML with textContent or use DOMPurify
3. Specify exact targetOrigin instead of wildcard
4. Implement Content Security Policy (CSP)

This security analysis was automatically generated by Hacktron

📊 Found 3 security findings
📊 View Full Report: http://dev.app.hacktron.ai/scans/github_bWFla3Vzcy90ZXN0LWVycm9yLTE_1764842879555_1y8ii43t5