Apple Security Advisory 2021-05-25-7

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APPLE-SA-2021-05-25-7 tvOS 14.6

tvOS 14.6 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/HT212532.

Audio
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted audio file may lead to
arbitrary code execution
Description: This issue was addressed with improved checks.
CVE-2021-30707: hjy79425575 working with Trend Micro Zero Day
Initiative

Audio
Available for: Apple TV 4K and Apple TV HD
Impact: Parsing a maliciously crafted audio file may lead to
disclosure of user information
Description: This issue was addressed with improved checks.
CVE-2021-30685: Mickey Jin (@patch1t) of Trend Micro

CoreAudio
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 bounds
checking.
CVE-2021-30686: Mickey Jin of Trend Micro

Crash Reporter
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: A logic issue was addressed with improved state
management.
CVE-2021-30727: Cees Elzinga

CVMS
Available for: Apple TV 4K and Apple TV HD
Impact: A local attacker may be able to elevate  their privileges
Description: This issue was addressed with improved checks.
CVE-2021-30724: Mickey Jin (@patch1t) of Trend Micro

Heimdal
Available for: Apple TV 4K and Apple TV HD
Impact: A local user may be able to leak sensitive user information
Description: A logic issue was addressed with improved state
management.
CVE-2021-30697: Gabe Kirkpatrick (@gabe_k)

Heimdal
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may cause a denial of service or
potentially disclose memory contents
Description: A memory corruption issue was addressed with improved
state management.
CVE-2021-30710: Gabe Kirkpatrick (@gabe_k)

ImageIO
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted image may lead to disclosure
of user information
Description: An out-of-bounds read was addressed with improved bounds
checking.
CVE-2021-30687: Hou JingYi (@hjy79425575) of Qihoo 360

ImageIO
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted image may lead to disclosure
of user information
Description: This issue was addressed with improved checks.
CVE-2021-30700: Ye Zhang(@co0py_Cat) of Baidu Security

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-2021-30701: Mickey Jin (@patch1t) of Trend Micro and Ye Zhang of
Baidu Security

ImageIO
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted ASTC file may disclose
memory contents
Description: This issue was addressed with improved checks.
CVE-2021-30705: Ye Zhang of Baidu Security

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 logic issue was addressed with improved validation.
CVE-2021-30740: Linus Henze (pinauten.de)

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to execute arbitrary code with
kernel privileges
Description: A logic issue was addressed with improved state
management.
CVE-2021-30704: an anonymous researcher

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted message may lead to a denial
of service
Description: A logic issue was addressed with improved state
management.
CVE-2021-30715: The UK's National Cyber Security Centre (NCSC)

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to execute arbitrary code with
kernel privileges
Description: A buffer overflow was addressed with improved size
validation.
CVE-2021-30736: Ian Beer of Google Project Zero

LaunchServices
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to break out of its
sandbox
Description: This issue was addressed with improved environment
sanitization.
CVE-2021-30677: Ron Waisberg (@epsilan)

Security
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted certificate may lead to
arbitrary code execution
Description: A memory corruption issue in the ASN.1 decoder was
addressed by removing the vulnerable code.
CVE-2021-30737: xerub

WebKit
Available for: Apple TV 4K and Apple TV HD
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 memory corruption issue was addressed with improved
state management.
CVE-2021-30665: yangkang (@dnpushme)&zerokeeper&bianliang of 360 ATA

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
universal cross site scripting
Description: A cross-origin issue with iframe elements was addressed
with improved tracking of security origins.
CVE-2021-30744: Dan Hite of jsontop

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-2021-21779: Marcin Towalski of Cisco Talos

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to leak sensitive user
information
Description: A logic issue was addressed with improved restrictions.
CVE-2021-30682: an anonymous researcher and 1lastBr3ath

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to
universal cross site scripting
Description: A logic issue was addressed with improved state
management.
CVE-2021-30689: 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: Multiple memory corruption issues were addressed with
improved memory handling.
CVE-2021-30749: an anonymous researcher and mipu94 of SEFCOM lab,
ASU. working with Trend Micro Zero Day Initiative
CVE-2021-30734: Jack Dates of RET2 Systems, Inc. (@ret2systems)
working with Trend Micro Zero Day Initiative

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious website may be able to access restricted ports on
arbitrary servers
Description: A logic issue was addressed with improved restrictions.
CVE-2021-30720: David Schütz (@xdavidhu)

WebKit
Available for: Apple TV 4K and Apple TV HD
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: An integer overflow was addressed with improved input
validation.
CVE-2021-30663: an anonymous researcher

Additional recognition

ImageIO
We would like to acknowledge Jzhu working with Trend Micro Zero Day
Initiative and an anonymous researcher for their assistance.

WebKit
We would like to acknowledge Chris Salls (@salls) of Makai Security
for their assistance.

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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