VUPEN Security Research - Apple Safari Scrollbar Handling Use-after-free 
Vulnerability (VUPEN-SR-2010-245)

http://www.vupen.com/english/research.php


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

"Apple Safari is a web browser developed by Apple. As of February 2010,
Safari was the fourth most widely used browser, with 4.45% of the
worldwide usage share of web browsers according to Net Application."


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

VUPEN Vulnerability Research Team discovered a critical vulnerability
in Apple Safari.

The vulnerability is caused by a use-after-free in WebKit when handling
scrollbars, which could be exploited by remote attackers to execute
arbitrary code by tricking a user into visiting a specially crafted web 
page.


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

Apple Safari version 5.0.2 and prior
Apple Safari version 4.1.2 and prior


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

In-depth binary analysis of the vulnerability and a code execution exploit
with ASLR and DEP bypass are available through the VUPEN Binary Analysis &
Exploits Service :

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


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

Governments and Intelligence agencies who are members of the VUPEN Threat
Protection Program (TPP) have been alerted about the vulnerability when it
was discovered by VUPEN, and have received a detailed detection guidance
to proactively protect national and critical infrastructures against
potential attacks exploiting this vulnerability:

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


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

Upgrade to Apple Safari version 5.0.3 or 4.1.3


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

This vulnerability was discovered by Matthieu Bonetti of VUPEN Security


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

VUPEN is a leading IT security research company providing vulnerability
management and security intelligence solutions which enable enterprises
and institutions to eliminate vulnerabilities before they can be exploited,
ensure security policy compliance and meaningfully measure and manage risks.

Governmental and federal agencies, and global enterprises in the financial
services, insurance, manufacturing and technology industries rely on VUPEN
to improve their security, prioritize resources, cut time and costs, and
stay ahead of the latest threats.

* VUPEN Vulnerability Notification Service (VNS) :
http://www.vupen.com/english/services/vns-index.php

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

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

* VUPEN Web Application Security Scanner (WASS) :
http://www.vupen.com/english/services/wass-index.php


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

http://www.vupen.com/english/research-vuln.php
http://support.apple.com/kb/HT4455


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

2010-07-22 - TPP Customers notified
2010-11-19 - Vulnerability Fixed in Safari