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APPLE-SA-2018-04-24-1 iOS 11.3.1

iOS 11.3.1 is now available and addresses the following:

Crash Reporter
Available for: iPhone 5s and later, iPad Air and later, and
iPod touch 6th generation
Impact: An application may be able to gain elevated privileges
Description: A memory corruption issue was addressed with improved
error handling.
CVE-2018-4206: Ian Beer of Google Project Zero

LinkPresentation
Available for: iPhone 5s and later, iPad Air and later, and
iPod touch 6th generation
Impact: Processing a maliciously crafted text message may lead to UI
spoofing
Description: A spoofing issue existed in the handling of URLs. This
issue was addressed with improved input validation.
CVE-2018-4187: Zhiyang Zeng (@Wester) of Tencent Security
Platform Department, Roman Mueller (@faker_)

WebKit
Available for: iPhone 5s and later, iPad Air and later, and
iPod touch 6th generation
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A memory corruption issue was addressed with improved
state management.
CVE-2018-4200: Ivan Fratric of Google Project Zero

WebKit
Available for: iPhone 5s and later, iPad Air and later, and
iPod touch 6th generation
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2018-4204: Richard Zhu (fluorescence) working with Trend Micro's
Zero Day Initiative, found by OSS-Fuzz

Installation note:

This update is available through iTunes and Software Update on your
iOS device, 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 https://www.apple.com/itunes/

iTunes and Software Update on the device will automatically check
Apple's update server on its weekly schedule. When an update is
detected, it is downloaded and the option to be installed is
presented to the user when the iOS device is docked. We recommend
applying the update immediately if possible. Selecting Don't Install
will present the option the next time you connect your iOS device.

The automatic update process may take up to a week depending on the
day that iTunes or the device checks for updates. You may manually
obtain the update via the Check for Updates button within iTunes, or
the Software Update on your device.

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 "iOS 11.3.1".

Information will also be posted to the Apple Security Updates
web site: https://support.apple.com/kb/HT201222

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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