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APPLE-SA-2021-10-26-4 macOS Big Sur 11.6.1

macOS Big Sur 11.6.1 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/HT212872.

AppleScript
Available for: macOS Big Sur
Impact: Processing a maliciously crafted AppleScript binary may
result in unexpected application termination or disclosure of process
memory
Description: An out-of-bounds read was addressed with improved bounds
checking.
CVE-2021-30876: Jeremy Brown, hjy79425575
CVE-2021-30879: Jeremy Brown, hjy79425575
CVE-2021-30877: Jeremy Brown
CVE-2021-30880: Jeremy Brown

Audio
Available for: macOS Big Sur
Impact: A malicious application may be able to elevate privileges
Description: An integer overflow was addressed through improved input
validation.
CVE-2021-30907: Zweig of Kunlun Lab

Bluetooth
Available for: macOS Big Sur
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: A race condition was addressed with improved state
handling.
CVE-2021-30899: Weiteng Chen, Zheng Zhang, and Zhiyun Qian of UC
Riverside, and Yu Wang of Didi Research America

ColorSync
Available for: macOS Big Sur
Impact: Processing a maliciously crafted image may lead to arbitrary
code execution
Description: A memory corruption issue existed in the processing of
ICC profiles. This issue was addressed with improved input
validation.
CVE-2021-30917: Alexandru-Vlad Niculae and Mateusz Jurczyk of Google
Project Zero

CoreGraphics
Available for: macOS Big Sur
Impact: Processing a maliciously crafted PDF may lead to arbitrary
code execution
Description: An out-of-bounds write was addressed with improved input
validation.
CVE-2021-30919

FileProvider
Available for: macOS Big Sur
Impact: Unpacking a maliciously crafted archive may lead to arbitrary
code execution
Description: An input validation issue was addressed with improved
memory handling.
CVE-2021-30881: Simon Huang (@HuangShaomang) and pjf of IceSword Lab
of Qihoo 360

iCloud
Available for: macOS Big Sur
Impact: A local attacker may be able to elevate their privileges
Description: This issue was addressed with improved checks.
CVE-2021-30906: Cees Elzinga

Intel Graphics Driver
Available for: macOS Big Sur
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: A memory corruption issue was addressed with improved
state management.
CVE-2021-30824: Antonio Zekic (@antoniozekic) of Diverto

Intel Graphics Driver
Available for: macOS Big Sur
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: Multiple out-of-bounds write issues were addressed with
improved bounds checking.
CVE-2021-30901: Zuozhi Fan (@pattern_F_) of Ant Security TianQiong
Lab, Yinyi Wu (@3ndy1), Jack Dates of RET2 Systems, Inc.

IOGraphics
Available for: macOS Big Sur
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2021-30821: Tim Michaud (@TimGMichaud) of Zoom Video
Communications

IOMobileFrameBuffer
Available for: macOS Big Sur
Impact: An application may be able to execute arbitrary code with
kernel privileges. Apple is aware of a report that this issue may
have been actively exploited.
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2021-30883: an anonymous researcher

Kernel
Available for: macOS Big Sur
Impact: An application may be able to execute arbitrary code with
kernel privileges
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2021-30909: Zweig of Kunlun Lab

Kernel
Available for: macOS Big Sur
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: A memory corruption issue was addressed with improved
memory handling.
CVE-2021-30916: Zweig of Kunlun Lab

Model I/O
Available for: macOS Big Sur
Impact: Processing a maliciously crafted file may disclose user
information
Description: An out-of-bounds read was addressed with improved bounds
checking.
CVE-2021-30910: Mickey Jin (@patch1t) of Trend Micro

Model I/O
Available for: macOS Big Sur
Impact: Processing a maliciously crafted USD file may disclose memory
contents
Description: An out-of-bounds read was addressed with improved bounds
checking.
CVE-2021-30911: Rui Yang and Xingwei Lin of Ant Security Light-Year
Lab

SMB
Available for: macOS Big Sur
Impact: A malicious application may be able to execute arbitrary code
with kernel privileges
Description: A race condition was addressed with improved locking.
CVE-2021-30868: Peter Nguyen Vu Hoang of STAR Labs

SoftwareUpdate
Available for: macOS Big Sur
Impact: An unprivileged application may be able to edit NVRAM
variables
Description: The issue was addressed with improved permissions logic.
CVE-2021-30913: Kirin (@Pwnrin) and chenyuwang (@mzzzz__) of Tencent
Security Xuanwu Lab

SoftwareUpdate
Available for: macOS Big Sur
Impact: A malicious application may gain access to a user's Keychain
items
Description: The issue was addressed with improved permissions logic.
CVE-2021-30912: Kirin (@Pwnrin) and chenyuwang (@mzzzz__) of Tencent
Security Xuanwu Lab

UIKit
Available for: macOS Big Sur
Impact: A person with physical access to an iOS device may be able to
determine characteristics of a user's password in a secure text entry
field
Description: A logic issue was addressed with improved state
management.
CVE-2021-30915: Kostas Angelopoulos

Windows Server
Available for: macOS Big Sur
Impact: A local attacker may be able to view the previous logged-in
user’s desktop from the fast user switching screen
Description: An authentication issue was addressed with improved
state management.
CVE-2021-30908: ASentientBot

zsh
Available for: macOS Big Sur
Impact: A malicious application may be able to modify protected parts
of the file system
Description: An inherited permissions issue was addressed with
additional restrictions.
CVE-2021-30892: Jonathan Bar Or of Microsoft

Additional recognition

iCloud
We would like to acknowledge Ryan Pickren (ryanpickren.com) for their
assistance.

Installation note:
This update may be obtained from the Mac App Store

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/

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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