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

                               ESB-2021.3155
                       APPLE-SA-2021-09-20-3 tvOS 15
                             21 September 2021

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

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

Product:           tvOS
Publisher:         Apple
Operating System:  Apple iOS
Impact/Access:     Root Compromise                 -- Remote with User Interaction
                   Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Remote with User Interaction
                   Access Confidential Data        -- Remote with User Interaction
                   Reduced Security                -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-30857 CVE-2021-30854 CVE-2021-30851
                   CVE-2021-30850 CVE-2021-30849 CVE-2021-30847
                   CVE-2021-30846 CVE-2021-30843 CVE-2021-30842
                   CVE-2021-30841 CVE-2021-30837 CVE-2021-30835
                   CVE-2021-30810 CVE-2013-0340 

Reference:         ESB-2019.2136
                   ESB-2018.0201

Original Bulletin: 
   https://support.apple.com/kb/HT201222

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APPLE-SA-2021-09-20-3 tvOS 15

tvOS 15 addresses the following issues. Information about the security
content is also available at https://support.apple.com/HT212815.

Accessory Manager
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to execute arbitrary code with
kernel privileges
Description: A memory consumption issue was addressed with improved
memory handling.
CVE-2021-30837: an anonymous researcher

FontParser
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted dfont file may lead to
arbitrary code execution
Description: This issue was addressed with improved checks.
CVE-2021-30841: Xingwei Lin of Ant Security Light-Year Lab
CVE-2021-30842: Xingwei Lin of Ant Security Light-Year Lab
CVE-2021-30843: Xingwei Lin of Ant Security Light-Year Lab

ImageIO
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted image may lead to arbitrary
code execution
Description: This issue was addressed with improved checks.
CVE-2021-30835: Ye Zhang of Baidu Security
CVE-2021-30847: Mike Zhang of Pangu Lab

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: A race condition was addressed with improved locking.
CVE-2021-30857: Zweig of Kunlun Lab

libexpat
Available for: Apple TV 4K and Apple TV HD
Impact: A remote attacker may be able to cause a denial of service
Description: This issue was addressed by updating expat to version
2.4.1.
CVE-2013-0340: an anonymous researcher

Preferences
Available for: Apple TV 4K and Apple TV HD
Impact: A sandboxed process may be able to circumvent sandbox
restrictions
Description: A logic issue was addressed with improved state
management.
CVE-2021-30854: Zhipeng Huo (@R3dF09) and Yuebin Sun (@yuebinsun2020)
of Tencent Security Xuanwu Lab (xlab.tencent.com)

Sandbox
Available for: Apple TV 4K and Apple TV HD
Impact: A user may gain access to protected parts of the file system
Description: An access issue was addressed with improved access
restrictions.
CVE-2021-30850: an anonymous researcher

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2021-30846: Sergei Glazunov of Google Project Zero

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: Multiple memory corruption issues were addressed with
improved memory handling.
CVE-2021-30849: Sergei Glazunov of Google Project Zero

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to code
execution
Description: A memory corruption vulnerability was addressed with
improved locking.
CVE-2021-30851: Samuel GroÃ\x{159} of Google Project Zero

Wi-Fi
Available for: Apple TV 4K and Apple TV HD
Impact: An attacker in physical proximity may be able to force a user
onto a malicious Wi-Fi network during device setup
Description: An authorization issue was addressed with improved state
management.
CVE-2021-30810: an anonymous researcher

Additional recognition

Assets
We would like to acknowledge Cees Elzinga for their assistance.

UIKit
We would like to acknowledge an anonymous researcher for their
assistance.

Installation note:

Apple TV will periodically check for software updates. Alternatively,
you may manually check for software updates by selecting
"Settings -> System -> Software Update -> Update Software."

To check the current version of software, select
"Settings -> General -> About."

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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