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The Art of Leaks: The Return of Heap Feng Shui

jscript9

heap

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Using the vulnerability of allocating the large heap without randomness, we can leak any object address allocated in jscript9 custom heap, and bypass ASLR in Internet Explorer on Windows 7/8/8.1.

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The Art of Leaks:

The Return of Heap Feng Shui

Ga1ois

@NSFOCUS Security Labs

Agenda

• Who am I

• Abstract

• Background

• Heap Feng Shui in jscript9

• UAF->Arbitrary Address Write

• Summary

• Q&A

Who am I

• Security researcher @NSFOCUS Security Labs

since April/2011

– The security of browser and flash player

– Vulnerability discovery

– Exploit technique

– APT/0 day attacks detection

• ga1ois@weibo&twitter; heyoungart@gmail.com

• http://hi.baidu.com/ga1ois

Abstract

Using the vulnerability of allocating the large heap

without randomness, we can leak any object

address allocated in jscript9 custom heap, and

bypass ASLR in Internet Explorer on Windows

7/8/8.1.

Background

IE OBA(Out of Bounds Access) vulnerability

Timeline:

• Attack: Pwn2own 2010 exploit @WTFuzz

• Defense: MicroSoft kill BSTR allocated by

substr/substring in jscript9

• Attack: Find other BSTR path to complete heap layout

– Using BSTR in jscript(@yuange1975) and in

vbscript(@K33n Team)

– Using Element Attribute in cve-2013-0003(@VUPEN)

• Defense ?

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