ALERT iOS: Multiple vulnerabilities

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                         ZMCIRT Vulnerability Bulletin

                             ZMC-2021.09.24.1700
                  ALERT iOS: Multiple vulnerabilities
                               24th Sep 2021

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Product:           iOS
Publisher:         Apple
Operating System:  Apple iOS
Impact/Access:     Root Compromise                 -- Remote with User Interaction
                   Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-30869 CVE-2021-30860 CVE-2021-30858

Reference:         ESB-2021.3198
                   ESB-2021.3161
                   ESB-2021.3103
                   ESB-2021.3100

Original Bulletin: 
   https://support.apple.com/en-us/HT212824

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APPLE-SA-2021-09-23-1 iOS 12.5.5

iOS 12.5.5 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/HT212824.

CoreGraphics
Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad
mini 2, iPad mini 3, and iPod touch (6th generation)
Impact: Processing a maliciously crafted PDF may lead to arbitrary
code execution. Apple is aware of a report that this issue may have
been actively exploited.
Description: An integer overflow was addressed with improved input
validation.
CVE-2021-30860: The Citizen Lab

WebKit
Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad
mini 2, iPad mini 3, and iPod touch (6th generation)
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution. Apple is aware of a report that this issue
may have been actively exploited.
Description: A use after free issue was addressed with improved
memory management.
CVE-2021-30858: an anonymous researcher

XNU
Available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad
mini 2, iPad mini 3, and iPod touch (6th generation)
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges. Apple is aware of reports that an exploit for
this issue exists in the wild.
Description: A type confusion issue was addressed with improved state
handling.
CVE-2021-30869: Erye Hernandez of Google Threat Analysis Group,
Clément Lecigne of Google Threat Analysis Group, and Ian Beer of
Google Project Zero

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 "12.5.5"

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/


 
ZMCIRT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. ZMCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

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