VUPEN Security Research - Apple Safari WebKit Block Dimensions Handling 
Integer Overflow

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 an integer overflow error in the WebKit
library when handling block dimensions, which could be exploited by
remote attackers to compromise a vulnerable system by tricking a user into
visiting a specially crafted web page.

CVSS Score: 10 (AV:N/AC:L/Au:N/C:C/I:C/A:C)


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

Apple Safari version 5.0.3 and prior


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

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

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


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

To proactively protect critical networks and infrastructures against 
unpatched
vulnerabilities and reduce risks related to zero-day attacks, VUPEN shares 
its
vulnerability research with governments and organizations members of the 
VUPEN
Threat Protection Program (TPP).

VUPEN TPP customers receive fully detailed and technical reports about 
security
vulnerabilities discovered by VUPEN and in advance of their public 
disclosure.

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


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

Upgrade to Apple Safari version 5.0.4.


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://www.vupen.com/english/advisories/2011/0641
http://support.apple.com/kb/HT4566


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

2010-11-17 - Vulnerability Discovered by VUPEN
2010-11-20 - VUPEN TPP customers informed
2011-03-09 - Apple Safari version 5.0.4 released