Microsoft Edge Chakra JIT - InitializeNumberFormat and InitializeDateTimeFormat Type Confusion Explo
| Reporter | Title | Published | Views | Family All 36 |
|---|---|---|---|---|
 | CVE-2018-8298 | 11 Jul 201800:00 | – | attackerkb |
| CVE-2018-8287 | 11 Jul 201800:00 | – | attackerkb |
 | ChakraCore Memory Object Handling Code Execution | 27 Dec 201800:00 | – | bdu_fstec |
 | CVE-2018-8298 | 17 Aug 201800:00 | – | circl |
 | ChakraCore Scripting Engine Type Confusion Vulnerability | 3 Mar 202200:00 | – | cisa_kev |
 | Microsoft ChakraCore Remote Code Execution Vulnerability (CNVD-2018-15861) | 12 Jul 201800:00 | – | cnvd |
 | Microsoft Chakra Scripting Engine Memory Corruption (CVE-2018-8298) | 10 Jul 201800:00 | – | checkpoint_advisories |
 | CVE-2018-8298 | 11 Jul 201800:00 | – | cve |
 | CVE-2018-8298 | 11 Jul 201800:00 | – | cvelist |
 | Microsoft Edge Chakra JIT - InitializeNumberFormat and InitializeDateTimeFormat Type Confusion | 17 Aug 201800:00 | – | exploitdb |
10
/*
The InitializeNumberFormat function in Intl.js is used to initialize an Intl.NumberFormat object, and InitializeDateTimeFormat is used for an Intl.DateTimeFormat object. There are two versions of each initializer. One is for WinGlob and the other is for ICU. The problem is that the versions for ICU don't check whether the given object has been initialized. This allows to initialize the same object multiple times which can lead to type confusion.
It seems the recent version of Edge in Windows Insider Preview has started to use ICU. Tested on Microsoft Edge 42.17672.1000.0 and Microsoft EdgeHTML 17.17672.
The initializer for ICU has no check:
https://github.com/Microsoft/ChakraCore/blob/bc2e55a7d80338ee4c9c63b76893f6d816dfe70b/lib/Runtime/Library/InJavascript/Intl.js#L1151
The initializer for WinGlob has a check:
https://github.com/Microsoft/ChakraCore/blob/bc2e55a7d80338ee4c9c63b76893f6d816dfe70b/lib/Runtime/Library/InJavascript/Intl.js#L3046
PoC:
*/
let object = {};
Intl.NumberFormat.apply(object);
Intl.DateTimeFormat.apply(object);
Intl.DateTimeFormat.prototype.formatToParts.apply(object);
# 0day.today [2018-08-17] #Data
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17 Aug 2018 00:00Current
7.8High risk
Vulners AI Score7.8
EPSS0.74694