VUPEN Security Research - Apple Safari Text Nodes Remote Use-after-free 
Vulnerability (CVE-2011-1344)

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 error in the WebKit
library when processing certain text nodes, which could be exploited by
remote attackers to execute arbitrary code 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 5.0.4 and prior for Windows and Mac OS X
Apple iOS versions 3.0 through 4.3.1 for iPhone 3GS and later
Apple iOS versions 3.1 through 4.3.1 for iPod touch (3rd generation) and 
later
Apple iOS versions 3.2 through 4.3.1 for iPad
Apple iOS versions 4.2.5 through 4.2.6 for iPhone 4 (CDMA)


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 5.0.5 for Windows and Mac OS X.

Upgrade to Apple iOS version 4.3.2 for iPhone, iPod, and iPad.

Upgrade to Apple iOS version 4.2.7 for iPhone 4 (CDMA).


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/2011/0984
http://www.vupen.com/english/advisories/2011/0983
http://support.apple.com/kb/HT4596
http://support.apple.com/kb/HT4606
http://support.apple.com/kb/HT4607


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

2011-02-26 - Vulnerability Discovered by VUPEN
2011-04-14 - Apple updates available