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Category:   Application (Web Browser)  >   Apple Safari Vendors:   Apple
(Apple Issues Fix for iOS) Apple Safari Text Node Use-After-Free Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1025367
SecurityTracker URL:  http://securitytracker.com/id/1025367
CVE Reference:   CVE-2011-1344   (Links to External Site)
Date:  Apr 14 2011
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 5.0.5
Description:   A vulnerability was reported in Apple Safari. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create specially crafted HTML that, when loaded by the target user, will trigger a use-after-free in the processing of text nodes and execute arbitrary code on the target system. The code will run with the privileges of the target user.

VUPEN Security working with TippingPoint's Zero Day Initiative and Martin Barbella reported this vulnerability.

Impact:   A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   Apple has issued a fix for iOS (4.3.2) for iPhone 3GS and later, iPod touch, and iPad.

The Apple advisory is available at:

http://support.apple.com/kb/HT4606

Vendor URL:  support.apple.com/kb/HT4596 (Links to External Site)
Cause:   Access control error
Underlying OS:  Apple (iOS)

Message History:   This archive entry is a follow-up to the message listed below.
Apr 14 2011 Apple Safari Text Node Use-After-Free Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  APPLE-SA-2011-04-14-1 iOS 4.3.2 Software Update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

APPLE-SA-2011-04-14-1 iOS 4.3.2 Software Update

iOS 4.3.2 Software Update is now available and addresses the
following:

Certificate Trust Policy
Available for:  iOS 3.0 through 4.3.1 for iPhone 3GS and later,
iOS 3.1 through 4.3.1 for iPod touch (3rd generation) and later,
iOS 3.2 through 4.3.1 for iPad
Impact:  An attacker with a privileged network position may intercept
user credentials or other sensitive information
Description:  Several fraudulent SSL certificates were issued by a
Comodo affiliate registration authority. This may allow a man-in-the-
middle attacker to redirect connections and intercept user
credentials or other sensitive information. This issue is addressed
by blacklisting the fraudulent certificates. Note: For Mac OS X
systems, this issue is addressed with Security Update 2011-002. For
Windows systems, Safari relies on the certificate store of the host
operating system to determine if an SSL server certificate is
trustworthy. Applying the update described in Microsoft Knowledge
Base Article 2524375 will cause Safari to regard these certificates
as untrusted. The article is available at
http://support.microsoft.com/kb/2524375

libxslt
Available for:  iOS 3.0 through 4.3.1 for iPhone 3GS and later,
iOS 3.1 through 4.3.1 for iPod touch (3rd generation) and later,
iOS 3.2 through 4.3.1 for iPad
Impact:  Visiting a maliciously crafted website may lead to the
disclosure of addresses on the heap
Description:  libxslt's implementation of the generate-id() XPath
function disclosed the address of a heap buffer. Visiting a
maliciously crafted website may lead to the disclosure of addresses
on the heap, which may aid in bypassing address space layout
randomization protection. This issue is addressed by generating an ID
based on the difference between the addresses of two heap buffers.
CVE-ID
CVE-2011-0195 : Chris Evans of Google Chrome Security Team

QuickLook
Available for:  iOS 3.0 through 4.3.1 for iPhone 3GS and later,
iOS 3.1 through 4.3.1 for iPod touch (3rd generation) and later,
iOS 3.2 through 4.3.1 for iPad
Impact:  Viewing a maliciously crafted Microsoft Office file may lead
to an unexpected application termination or arbitrary code execution
Description:  A memory corruption issue existed in QuickLook's
handling of Microsoft Office files. Viewing a maliciously crafted
Microsoft Office file may lead to an unexpected application
termination or arbitrary code execution.
CVE-ID
CVE-2011-1417 : Charlie Miller and Dion Blazakis working with
TippingPoint's Zero Day Initiative

WebKit
Available for:  iOS 3.0 through 4.3.1 for iPhone 3GS and later,
iOS 3.1 through 4.3.1 for iPod touch (3rd generation) and later,
iOS 3.2 through 4.3.1 for iPad
Impact:  Visiting a maliciously crafted website may lead to an
unexpected application termination or arbitrary code execution
Description:  An integer overflow issue existed in the handling of
nodesets. Visiting a maliciously crafted website may lead to an
unexpected application termination or arbitrary code execution.
CVE-ID
CVE-2011-1290 : Vincenzo Iozzo, Willem Pinckaers, Ralf-Philipp
Weinmann, and an anonymous researcher working with TippingPoint's
Zero Day Initiative

WebKit
Available for:  iOS 3.0 through 4.3.1 for iPhone 3GS and later,
iOS 3.1 through 4.3.1 for iPod touch (3rd generation) and later,
iOS 3.2 through 4.3.1 for iPad
Impact:  Visiting a maliciously crafted website may lead to an
unexpected application termination or arbitrary code execution
Description:  A use after free issue existed in the handling of text
nodes. Visiting a maliciously crafted website may lead to an
unexpected application termination or arbitrary code execution.
CVE-ID
CVE-2011-1344 : Vupen Security working with TippingPoint's Zero Day
Initiative, and Martin Barbella


Installation note:

These updates are only available through iTunes, and will not appear
in your computer's Software Update application, or in the Apple
Downloads site. Make sure you have an Internet connection and have
installed the latest version of iTunes from www.apple.com/itunes/

iTunes will automatically check Apple's update server on its weekly
schedule. When an update is detected, it will download it. When
the iPhone, iPod touch or iPad is docked, iTunes will present the
user with the option to install the update. We recommend applying
the update immediately if possible. Selecting Don't Install will
present the option the next time you connect your iPhone, iPod touch,
or iPad.

The automatic update process may take up to a week depending on the
day that iTunes checks for updates. You may manually obtain the
update via the Check for Updates button within iTunes. After doing
this, the update can be applied when your iPhone, iPod touch, or iPad
is docked to your computer.

To check that the iPhone, iPod touch, or iPad has been updated:

* Navigate to Settings
* Select General
* Select About. The version after applying this update will be
"4.3.2 (8H8)" or later for iPad 2 for Verizon, and 
"4.3.2 (8H7)" or later for everything else.

Information will also be posted to the Apple Security Updates
web site: http://support.apple.com/kb/HT1222

This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/

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 _______________________________________________
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