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Apple Security Advisory 2021-04-26-6

Apple Security Advisory 2021-04-26-6
Posted Apr 28, 2021
Authored by Apple | Site apple.com

Apple Security Advisory 2021-04-26-6 - tvOS 14.5 addresses buffer overflow, bypass, code execution, cross site scripting, denial of service, double free, heap corruption, out of bounds read, out of bounds write, and use-after-free vulnerabilities.

tags | advisory, denial of service, overflow, vulnerability, code execution, xss
systems | apple
advisories | CVE-2021-1739, CVE-2021-1740, CVE-2021-1808, CVE-2021-1809, CVE-2021-1811, CVE-2021-1813, CVE-2021-1815, CVE-2021-1816, CVE-2021-1817, CVE-2021-1820, CVE-2021-1822, CVE-2021-1825, CVE-2021-1826, CVE-2021-1832, CVE-2021-1836, CVE-2021-1843, CVE-2021-1844, CVE-2021-1846, CVE-2021-1849, CVE-2021-1851, CVE-2021-1857, CVE-2021-1858, CVE-2021-1860, CVE-2021-1864, CVE-2021-1868, CVE-2021-1875, CVE-2021-1881, CVE-2021-1882
MD5 | d1196bcc1613dbb6b8f54cd25ea9dea2

Apple Security Advisory 2021-04-26-6

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Hash: SHA256

APPLE-SA-2021-04-26-6 tvOS 14.5

tvOS 14.5 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/HT212323.

AppleMobileFileIntegrity
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to bypass Privacy
preferences
Description: An issue in code signature validation was addressed with
improved checks.
CVE-2021-1849: Siguza

Assets
Available for: Apple TV 4K and Apple TV HD
Impact: A local user may be able to create or modify privileged files
Description: A logic issue was addressed with improved restrictions.
CVE-2021-1836: an anonymous researcher

Audio
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to read restricted memory
Description: A memory corruption issue was addressed with improved
validation.
CVE-2021-1808: JunDong Xie of Ant Security Light-Year Lab

CFNetwork
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may disclose
sensitive user information
Description: A memory initialization issue was addressed with
improved memory handling.
CVE-2021-1857: an anonymous researcher

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 input
validation.
CVE-2021-1846: JunDong Xie of Ant Security Light-Year Lab

CoreAudio
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to read restricted memory
Description: A memory corruption issue was addressed with improved
validation.
CVE-2021-1809: JunDong Xie of Ant Security Light-Year Lab

CoreText
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted font may result in the
disclosure of process memory
Description: A logic issue was addressed with improved state
management.
CVE-2021-1811: Xingwei Lin of Ant Security Light-Year Lab

FontParser
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted font file may lead to
arbitrary code execution
Description: An out-of-bounds read was addressed with improved input
validation.
CVE-2021-1881: an anonymous researcher, Xingwei Lin of Ant Security
Light-Year Lab, Mickey Jin of Trend Micro, and Hou JingYi
(@hjy79425575) of Qihoo 360

Foundation
Available for: Apple TV 4K and Apple TV HD
Impact: An application may be able to gain elevated privileges
Description: A memory corruption issue was addressed with improved
validation.
CVE-2021-1882: Gabe Kirkpatrick (@gabe_k)

Foundation
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to gain root privileges
Description: A validation issue was addressed with improved logic.
CVE-2021-1813: Cees Elzinga

Heimdal
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted server messages may lead to
heap corruption
Description: This issue was addressed with improved checks.
CVE-2021-1883: Gabe Kirkpatrick (@gabe_k)

Heimdal
Available for: Apple TV 4K and Apple TV HD
Impact: A remote attacker may be able to cause a denial of service
Description: A race condition was addressed with improved locking.
CVE-2021-1884: Gabe Kirkpatrick (@gabe_k)

ImageIO
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted image may lead to arbitrary
code execution
Description: An out-of-bounds read was addressed with improved bounds
checking.
CVE-2021-1885: CFF of Topsec Alpha Team

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-2021-30653: Ye Zhang of Baidu Security
CVE-2021-1843: Ye Zhang 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: An out-of-bounds write issue was addressed with improved
bounds checking.
CVE-2021-1858: Mickey Jin of Trend Micro

iTunes Store
Available for: Apple TV 4K and Apple TV HD
Impact: An attacker with JavaScript execution may be able to execute
arbitrary code
Description: A use after free issue was addressed with improved
memory management.
CVE-2021-1864: CodeColorist of Ant-Financial LightYear Labs

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to disclose kernel memory
Description: A memory initialization issue was addressed with
improved memory handling.
CVE-2021-1860: @0xalsr

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 buffer overflow was addressed with improved bounds
checking.
CVE-2021-1816: Tielei Wang of Pangu Lab

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-2021-1851: @0xalsr

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: Copied files may not have the expected file permissions
Description: The issue was addressed with improved permissions logic.
CVE-2021-1832: an anonymous researcher

Kernel
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to disclose kernel memory
Description: An out-of-bounds read was addressed with improved bounds
checking.
CVE-2021-30660: Alex Plaskett

libxpc
Available for: Apple TV 4K and Apple TV HD
Impact: A malicious application may be able to gain root privileges
Description: A race condition was addressed with additional
validation.
CVE-2021-30652: James Hutchins

libxslt
Available for: Apple TV 4K and Apple TV HD
Impact: Processing a maliciously crafted file may lead to heap
corruption
Description: A double free issue was addressed with improved memory
management.
CVE-2021-1875: Found by OSS-Fuzz

MobileInstallation
Available for: Apple TV 4K and Apple TV HD
Impact: A local user may be able to modify protected parts of the
file system
Description: A logic issue was addressed with improved restrictions.
CVE-2021-1822: Bruno Virlet of The Grizzly Labs

Preferences
Available for: Apple TV 4K and Apple TV HD
Impact: A local user may be able to modify protected parts of the
file system
Description: A parsing issue in the handling of directory paths was
addressed with improved path validation.
CVE-2021-1815: Zhipeng Huo (@R3dF09) and Yuebin Sun (@yuebinsun2020)
of Tencent Security Xuanwu Lab (xlab.tencent.com)
CVE-2021-1739: Zhipeng Huo (@R3dF09) and Yuebin Sun (@yuebinsun2020)
of Tencent Security Xuanwu Lab (xlab.tencent.com)
CVE-2021-1740: Zhipeng Huo (@R3dF09) and Yuebin Sun (@yuebinsun2020)
of Tencent Security Xuanwu Lab (xlab.tencent.com)

Tailspin
Available for: Apple TV 4K and Apple TV HD
Impact: A local attacker may be able to elevate their privileges
Description: A logic issue was addressed with improved state
management.
CVE-2021-1868: Tim Michaud of Zoom Communications

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
validation.
CVE-2021-1844: ClĂ©ment Lecigne of Google’s Threat Analysis Group,
Alison Huffman of Microsoft Browser Vulnerability Research

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may lead to a
cross site scripting attack
Description: An input validation issue was addressed with improved
input validation.
CVE-2021-1825: Alex Camboe of Aon’s Cyber Solutions

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
state management.
CVE-2021-1817: an anonymous researcher

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 restrictions.
CVE-2021-1826: an anonymous researcher

WebKit
Available for: Apple TV 4K and Apple TV HD
Impact: Processing maliciously crafted web content may result in the
disclosure of process memory
Description: A memory initialization issue was addressed with
improved memory handling.
CVE-2021-1820: an anonymous researcher

WebKit Storage
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 use after free issue was addressed with improved
memory management.
CVE-2021-30661: yangkang(@dnpushme) of 360 ATA

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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