Microsoft Windows "LdrHotPatchRoutine" Remote ASLR Bypass (Pwn2Own 2013
/ MS13-063)

Website : http://www.vupen.com

Twitter : http://twitter.com/vupen


I. BACKGROUND
---------------------

"Microsoft Windows is a series of software operating systems and graphical
user interfaces produced by Microsoft. Windows had approximately 90% of
the market share of the client operating systems." (Wikipedia)


II. DESCRIPTION
---------------------

VUPEN Vulnerability Research Team discovered a critical vulnerability
in Microsoft Windows.

The vulnerability is caused by a design error in the
"ntdll.LdrHotPatchRoutine"
function which can be abused to load an arbitrary library e.g. from a remote
network share, leading to arbitrary code execution and ASLR bypass.


III. AFFECTED PRODUCTS
---------------------------

Microsoft Windows 7 for x64-based Systems
Microsoft Windows 7 for x64-based Systems Service Pack 1
Microsoft Windows Vista x64 Edition Service Pack 1
Microsoft Windows Vista x64 Edition Service Pack 2


IV. Binary Analysis & Exploits/PoCs
---------------------------------------

In-depth technical analysis of the vulnerability and a private exploit are
available through the VUPEN BAE (Binary Analysis & Exploits) portal:

http://www.vupen.com/english/services/ba-index.php

VUPEN Binary Analysis & Exploits Service provides private exploits and
in-depth technical analysis of the most significant public vulnerabilities
based on disassembly, reverse engineering, protocol analysis, and code
audit.

The service allows governments and major corporations to evaluate risks, and
protect infrastructures and assets against new threats. The service also
allows security vendors (IPS, IDS, AntiVirus) to supplement their internal
research efforts and quickly develop both vulnerability-based and
exploit-based signatures to proactively protect their customers from attacks
and emerging threats.


V. VUPEN Threat Protection Program
-----------------------------------

Governments and major corporations which are members of the VUPEN Threat
Protection Program (TPP) have been proactively alerted about the
vulnerability
when it was discovered by VUPEN in advance of its public disclosure, and
have received a detailed attack detection guidance to protect their systems
against potential 0-day attacks exploiting this vulnerability:

http://www.vupen.com/english/services/tpp-index.php


VI. SOLUTION
----------------

Apply MS13-063 security update.


VII. CREDIT
--------------

This vulnerability was discovered by Nicolas of VUPEN Security.


VIII. ABOUT VUPEN Security
---------------------------

VUPEN is the leading provider of defensive and offensive cybersecurity
intelligence and advanced vulnerability research. VUPEN solutions enable
corporations and governments to manage risks, and protect critical networks
and infrastructures against known and unknown vulnerabilities.

VUPEN solutions include:

* VUPEN Binary Analysis & Exploits Service (BAE) :
http://www.vupen.com/english/services/ba-index.php

* VUPEN Threat Protection Program (TPP) :
http://www.vupen.com/english/services/tpp-index.php


IX. REFERENCES
----------------------

http://technet.microsoft.com/en-us/security/bulletin/ms13-063
http://www.vupen.com/english/research.php


X. DISCLOSURE TIMELINE
-----------------------------

2012-09-15 - Vulnerability Discovered by VUPEN and Privately Shared with
Customers
2013-03-06 - Vulnerability Reported to Microsoft During Pwn2Own 2013
2013-08-13 - Vulnerability Fixed by MS13-063
2013-08-30 - Public disclosure