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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.1139
                         iOS 5.0.1 Software Update
                             11 November 2011

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:          iOS
Publisher:        Apple
Operating System: Apple iOS
Impact/Access:    Execute Arbitrary Code/Commands -- Remote with User Interaction
                  Access Confidential Data        -- Remote with User Interaction
Resolution:       Patch/Upgrade
CVE Names:        CVE-2011-3442 CVE-2011-3441 CVE-2011-3440
                  CVE-2011-3439 CVE-2011-3246 

Reference:        ESB-2011.1034
                  ESB-2011.1032

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APPLE-SA-2011-11-10-1 iOS 5.0.1 Software Update

iOS 5.0.1 Software Update is now available and addresses the
following:

CFNetwork
Available for:  iOS 3.0 through 5.0 for iPhone 3GS,
iPhone 4 and iPhone 4S,
iOS 3.1 through 5.0 for iPod touch (3rd generation) and later,
iOS 3.2 through 5.0 for iPad, iOS 4.3 through 5.0 for iPad 2
Impact:  Visiting a maliciously crafted website may lead to the
disclosure of sensitive information
Description:  An issue existed in CFNetwork's handling of maliciously
crafted URLs. When accessing a maliciously crafted HTTP or HTTPS URL,
CFNetwork could navigate to an incorrect server.
CVE-ID
CVE-2011-3246 : Erling Ellingsen of Facebook

CoreGraphics
Available for:  iOS 3.0 through 5.0 for iPhone 3GS,
iPhone 4 and iPhone 4S,
iOS 3.1 through 5.0 for iPod touch (3rd generation) and later,
iOS 3.2 through 5.0 for iPad, iOS 4.3 through 5.0 for iPad 2
Impact:  Viewing a document containing a maliciously crafted font may
lead to arbitrary code execution
Description:  Multiple memory corruption issues existed in FreeType,
the most serious of which may lead to arbitrary code execution when
processing a maliciously crafted font.
CVE-ID
CVE-2011-3439 : Apple

Data Security
Available for:  iOS 3.0 through 5.0 for iPhone 3GS,
iPhone 4 and iPhone 4S,
iOS 3.1 through 5.0 for iPod touch (3rd generation) and later,
iOS 3.2 through 5.0 for iPad, iOS 4.3 through 5.0 for iPad 2
Impact:  An attacker with a privileged network position may intercept
user credentials or other sensitive information
Description:  Two certificate authorities in the list of trusted root
certificates have independently issued intermediate certificates to
DigiCert Malaysia. DigiCert Malaysia has issued certificates with
weak keys that it is unable to revoke. An attacker with a privileged
network position could intercept user credentials or other sensitive
information intended for a site with a certificate issued by DigiCert
Malaysia. This issue is addressed by configuring default system trust
settings so that DigiCert Malaysia's certificates are not trusted. We
would like to acknowledge Bruce Morton of Entrust, Inc. for reporting
this issue.

Kernel
Available for:  iOS 3.0 through 5.0 for iPhone 3GS,
iPhone 4 and iPhone 4S,
iOS 3.1 through 5.0 for iPod touch (3rd generation) and later,
iOS 3.2 through 5.0 for iPad, iOS 4.3 through 5.0 for iPad 2
Impact:  An application may execute unsigned code
Description:  A logic error existed in the mmap system call's
checking of valid flag combinations. This issue may lead to a bypass
of codesigning checks. This issue does not affect devices running
iOS prior to version 4.3.
CVE-ID
CVE-2011-3442 : Charlie Miller of Accuvant Labs

libinfo
Available for:  iOS 3.0 through 5.0 for iPhone 3GS,
iPhone 4 and iPhone 4S,
iOS 3.1 through 5.0 for iPod touch (3rd generation) and later,
iOS 3.2 through 5.0 for iPad, iOS 4.3 through 5.0 for iPad 2
Impact:  Visiting a maliciously crafted website may lead to the
disclosure of sensitive information
Description:  An issue existed in libinfo's handling of DNS name
lookups. When resolving a maliciously crafted hostname, libinfo could
return an incorrect result.
CVE-ID
CVE-2011-3441 : Erling Ellingsen of Facebook, Per Johansson of
Blocket AB

Passcode Lock
Available for:  iOS 4.3 through 5.0 for iPad 2
Impact:  A person with physical access to a locked iPad 2 may be able
to access some of the user's data
Description:  When a Smart Cover is opened while iPad 2 is confirming
power off in the locked state, the iPad does not request a passcode.
This allows some access to the iPad, but data protected by Data
Protection is inaccessible and apps cannot be launched.
CVE-ID
CVE-2011-3440

Installation note:

This update is 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
"5.0.1 (9A405)".

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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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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===========================================================================
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