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Date: Mon, 20 Sep 2021 14:44:18 -0700
From: product-security-noreply--- via Fulldisclosure
 <fulldisclosure@...lists.org>
To: security-announce@...ts.apple.com
Subject: [FD] APPLE-SA-2021-09-20-2 watchOS 8

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Hash: SHA256

APPLE-SA-2021-09-20-2 watchOS 8

watchOS 8 addresses the following issues. Information about the
security content is also available at
https://support.apple.com/HT212819.

Accessory Manager
Available for: Apple Watch Series 3 and later
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

AppleMobileFileIntegrity
Available for: Apple Watch Series 3 and later
Impact: A local attacker may be able to read sensitive information
Description: This issue was addressed with improved checks.
CVE-2021-30811: an anonymous researcher working with Compartir

FontParser
Available for: Apple Watch Series 3 and later
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 Watch Series 3 and later
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 Watch Series 3 and later
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 Watch Series 3 and later
Impact: A remote attacker may be able to cause a denial of service
Description: This issue was addressed by updating expat to version
2.4.1.0
CVE-2013-0340: an anonymous researcher

Preferences
Available for: Apple Watch Series 3 and later
Impact: An application may be able to access restricted files
Description: A validation issue existed in the handling of symlinks.
This issue was addressed with improved validation of symlinks.
CVE-2021-30855: Zhipeng Huo (@R3dF09) and Yuebin Sun (@yuebinsun2020)
of Tencent Security Xuanwu Lab (xlab.tencent.com)

Preferences
Available for: Apple Watch Series 3 and later
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)

WebKit
Available for: Apple Watch Series 3 and later
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 Watch Series 3 and later
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 Watch Series 3 and later
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 GroƟ of Google Project Zero

Wi-Fi
Available for: Apple Watch Series 3 and later
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

Sandbox
We would like to acknowledge Csaba Fitzl (@theevilbit) of Offensive
Security for their assistance.

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

Installation note:

Instructions on how to update your Apple Watch software are
available at https://support.apple.com/kb/HT204641

To check the version on your Apple Watch, open the Apple Watch app
on your iPhone and select "My Watch > General > About".

Alternatively, on your watch, select "My Watch > 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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