About the security content of tvOS 14.4

This document describes the security content of tvOS 14.4.

About Apple security updates

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Apple security documents reference vulnerabilities by CVE-ID when possible.

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tvOS 14.4

Released January 26, 2021

Analytics

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 with improved checks.

CVE-2021-1761: Cees Elzinga

Entry added February 1, 2021

APFS

Available for: Apple TV 4K and Apple TV HD

Impact: A local user may be able to read arbitrary files

Description: The issue was addressed with improved permissions logic.

CVE-2021-1797: Thomas Tempelmann

Entry added February 1, 2021

CoreAnimation

Available for: Apple TV 4K and Apple TV HD

Impact: A malicious application could execute arbitrary code leading to compromise of user information

Description: A memory corruption issue was addressed with improved state management.

CVE-2021-1760: @S0rryMybad of 360 Vulcan Team

Entry added February 1, 2021

CoreAudio

Available for: Apple TV 4K and Apple TV HD

Impact: Processing maliciously crafted web content may lead to code execution

Description: An out-of-bounds write was addressed with improved input validation.

CVE-2021-1747: JunDong Xie of Ant Security Light-Year Lab

Entry added February 1, 2021

CoreGraphics

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 write issue was addressed with improved bounds checking.

CVE-2021-1776: Ivan Fratric of Google Project Zero

Entry added February 1, 2021

CoreMedia

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 input validation.

CVE-2021-1759: Hou JingYi (@hjy79425575) of Qihoo 360 CERT

Entry added February 1, 2021

CoreText

Available for: Apple TV 4K and Apple TV HD

Impact: Processing a maliciously crafted text file may lead to arbitrary code execution

Description: A stack overflow was addressed with improved input validation.

CVE-2021-1772: Mickey Jin of Trend Micro

Entry added February 1, 2021

CoreText

Available for: Apple TV 4K and Apple TV HD

Impact: A remote attacker may be able to cause arbitrary code execution

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1792: Mickey Jin & Junzhi Lu of Trend Micro

Entry added February 1, 2021

Crash Reporter

Available for: Apple TV 4K and Apple TV HD

Impact: A local user may be able to create or modify system files

Description: A logic issue was addressed with improved state management.

CVE-2021-1786: Csaba Fitzl (@theevilbit) of Offensive Security

Entry added February 1, 2021

Crash Reporter

Available for: Apple TV 4K and Apple TV HD

Impact: A local attacker may be able to elevate their privileges

Description: Multiple issues were addressed with improved logic.

CVE-2021-1787: James Hutchins

Entry added February 1, 2021

FairPlay

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 issue existed that led to the disclosure of kernel memory. This was addressed with improved input validation.

CVE-2021-1791: Junzhi Lu (@pwn0rz), Qi Sun & Mickey Jin of Trend Micro

Entry added February 1, 2021

FontParser

Available for: Apple TV 4K and Apple TV HD

Impact: A remote attacker may be able to cause arbitrary code execution

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1758: Peter Nguyen of STAR Labs

Entry added February 1, 2021

ImageIO

Available for: Apple TV 4K and Apple TV HD

Impact: Processing a maliciously crafted image may lead to a denial of service

Description: This issue was addressed with improved checks.

CVE-2021-1766: Danny Rosseau of Carve Systems

Entry added February 1, 2021

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 input validation.

CVE-2021-1785: Xingwei Lin of Ant Security Light-Year Lab

Entry added February 1, 2021

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 was addressed with improved input validation.

CVE-2021-1744: Xingwei Lin of Ant Security Light-Year Lab

Entry added February 1, 2021

ImageIO

Available for: Apple TV 4K and Apple TV HD

Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution

Description: A logic issue was addressed with improved state management.

CVE-2021-1818: Xingwei Lin from Ant-financial Light-Year Security Lab

Entry added February 1, 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-2021-1746: Xingwei Lin of Ant Security Light-Year Lab, and Mickey Jin & Qi Sun of Trend Micro

CVE-2021-1793: Xingwei Lin of Ant Security Light-Year Lab

Entry added February 1, 2021

ImageIO

Available for: Apple TV 4K and Apple TV HD

Impact: Processing a maliciously crafted image may lead to a denial of service

Description: A logic issue was addressed with improved state management.

CVE-2021-1773: Xingwei Lin of Ant Security Light-Year Lab

Entry added February 1, 2021

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-2021-1741: Xingwei Lin of Ant Security Light-Year Lab

CVE-2021-1743: Xingwei Lin of Ant Security Light-Year Lab, and Mickey Jin & Junzhi Lu of Trend Micro

Entry added February 1, 2021

ImageIO

Available for: Apple TV 4K and Apple TV HD

Impact: Processing a maliciously crafted image may lead to a denial of service

Description: An out-of-bounds read issue existed in the curl. This issue was addressed with improved bounds checking.

CVE-2021-1778: Xingwei Lin of Ant Security Light-Year Lab

Entry added February 1, 2021

ImageIO

Available for: Apple TV 4K and Apple TV HD

Impact: Processing a maliciously crafted image may lead to arbitrary code execution

Description: An access issue was addressed with improved memory management.

CVE-2021-1783: Xingwei Lin of Ant Security Light-Year Lab

Entry added February 1, 2021

IOSkywalkFamily

Available for: Apple TV 4K and Apple TV HD

Impact: A local attacker may be able to elevate their privileges

Description: An out-of-bounds read was addressed with improved bounds checking.

CVE-2021-1757: Proteas and Pan ZhenPeng (@Peterpan0927) of Alibaba Security

Entry added February 1, 2021

iTunes Store

Available for: Apple TV 4K and Apple TV HD

Impact: Processing a maliciously crafted URL may lead to arbitrary javascript code execution

Description: A validation issue was addressed with improved input sanitization.

CVE-2021-1748: CodeColorist of Ant-Financial Light-Year Labs

Entry added February 1, 2021

Kernel

Available for: Apple TV 4K and Apple TV HD

Impact: A remote attacker may be able to cause a denial of service

Description: A use after free issue was addressed with improved memory management.

CVE-2021-1764: Maxime Villard (m00nbsd)

Entry added February 1, 2021

Kernel

Available for: Apple TV 4K and Apple TV HD

Impact: An application may be able to execute arbitrary code with kernel privileges

Description: Multiple issues were addressed with improved logic.

CVE-2021-1750: @0xalsr

Entry added February 1, 2021

Kernel

Available for: Apple TV 4K and Apple TV HD

Impact: A malicious application may be able to elevate privileges. Apple is aware of a report that this issue may have been actively exploited.

Description: A race condition was addressed with improved locking.

CVE-2021-1782: an anonymous researcher

Swift

Available for: Apple TV 4K and Apple TV HD

Impact: A malicious attacker with arbitrary read and write capability may be able to bypass Pointer Authentication

Description: A logic issue was addressed with improved validation.

CVE-2021-1769: CodeColorist of Ant-Financial Light-Year Labs

Entry added February 1, 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-2021-1788: Francisco Alonso (@revskills)

Entry added February 1, 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-2021-1789: @S0rryMybad of 360 Vulcan Team

Entry added February 1, 2021

WebKit

Available for: Apple TV 4K and Apple TV HD

Impact: Maliciously crafted web content may violate iframe sandboxing policy

Description: This issue was addressed with improved iframe sandbox enforcement.

CVE-2021-1801: Eliya Stein of Confiant

Entry added February 1, 2021

WebRTC

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 port redirection issue was addressed with additional port validation.

CVE-2021-1799: Gregory Vishnepolsky & Ben Seri of Armis Security, and Samy Kamkar

Entry added February 1, 2021

Additional recognition

iTunes Store

We would like to acknowledge CodeColorist of Ant-Financial Light-Year Labs for their assistance.

Entry added February 1, 2021

Kernel

We would like to acknowledge Junzhi Lu (@pwn0rz), Mickey Jin & Jesse Change of Trend Micro for their assistance.

Entry added February 1, 2021

libpthread

We would like to acknowledge CodeColorist of Ant-Financial Light-Year Labs for their assistance.

Entry added February 1, 2021

Store Demo

We would like to acknowledge @08Tc3wBB for their assistance.

Entry added February 1, 2021

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