Otkriveno je nekoliko ranjivosti iOS operacijskog sustava za Apple mobilne uređaje (iPhone, iPad i iPod touch). Ranjivosti su vezane uz programske pakete: libxslt, QuickLook i WebKit. Nepravilnosti u WebKit i QuickLook paketima su posljedica korupcije memorije, a mogu se iskoristiti za DoS napad i pokretanje proizvoljnog programskog koda otvaranjem posebno oblikovane web stranice ili Microsoft Office dokumenta. Ranjivost libxst paketa može rezultirati otkrivanjem osjetljivih informacija i zaobilaženjem ograničenja zbog pogreške u funkciji "generate-id()". Preporuča se korištenje nadogradnje koja otklanja i moguće ranjivosti vezane uz kompromitirane SSL certifikate.

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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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