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APPLE-SA-2021-10-26-11 Additional information for
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

bootp
Available for: Apple TV 4K and Apple TV HD
Impact: A device may be passively tracked by its WiFi MAC address
Description: A user privacy issue was addressed by removing the
broadcast MAC address.
CVE-2021-30866: Fabien Duchêne of UCLouvain (Belgium)
Entry added October 25, 2021

CoreAudio
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a malicious audio file may result in unexpected
application termination or arbitrary code execution
Description: A logic issue was addressed with improved state
management.
CVE-2021-30834: JunDong Xie of Ant Security Light-Year Lab
Entry added October 25, 2021

FontParser
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted font may result in the
disclosure of process memory
Description: An out-of-bounds read was addressed with improved input
validation.
CVE-2021-30831: Xingwei Lin of Ant Security Light-Year Lab
Entry added October 25, 2021

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-2021-30840: Xingwei Lin of Ant Security Light-Year Lab
Entry added October 25, 2021

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

Foundation
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A type confusion issue was addressed with improved
memory handling.
CVE-2021-30852: Yinyi Wu (@3ndy1) of Ant Security Light-Year Lab
Entry added October 25, 2021

ImageIO
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted image may lead to arbitrary
code execution
Description: A memory corruption issue was addressed with improved
input validation.
CVE-2021-30814: hjy79425575
Entry added October 25, 2021

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

Sandbox
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to modify protected parts
of the file system
Description: This issue was addressed with improved checks.
CVE-2021-30808: Csaba Fitzl (@theevilbit) of Offensive Security
Entry added October 25, 2021

WebKit
Available for: Apple TV 4K and Apple TV 
Impact: Visiting a maliciously crafted website may reveal a user's
browsing history
Description: The issue was resolved with additional restrictions on
CSS compositing.
CVE-2021-30884: an anonymous researcher
Entry added October 25, 2021

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A type confusion issue was addressed with improved state
handling.
CVE-2021-30818: Amar Menezes (@amarekano) of Zon8Research
Entry added October 25, 2021

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: An attacker in a privileged network position may be able to
bypass HSTS
Description: A logic issue was addressed with improved restrictions.
CVE-2021-30823: David Gullasch of Recurity Labs
Entry added October 25, 2021

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted audio file may disclose
restricted memory
Description: An out-of-bounds read was addressed with improved input
validation.
CVE-2021-30836: Peter Nguyen Vu Hoang of STAR Labs
Entry added October 25, 2021

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
arbitrary code execution
Description: A use after free issue was addressed with improved
memory management.
CVE-2021-30809: an anonymous researcher
Entry added October 25, 2021

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 Groß 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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