About the security content of tvOS 13.4

This document describes the security content of tvOS 13.4.

About Apple security updates

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This document describes the security content of tvOS 13.4

Released March 24, 2020

ActionKit

Available for: Apple TV 4K and Apple TV HD

Impact: An application may be able to use an SSH client provided by private frameworks

Description: This issue was addressed with a new entitlement.

CVE-2020-3917: Steven Troughton-Smith (@stroughtonsmith)

AppleMobileFileIntegrity

Available for: Apple TV 4K and Apple TV HD

Impact: An application may be able to use arbitrary entitlements

Description: This issue was addressed with improved checks.

CVE-2020-3883: Linus Henze (pinauten.de)

Icons

Available for: Apple TV 4K and Apple TV HD

Impact: A malicious application may be able to identify what other applications a user has installed

Description: The issue was addressed with improved handling of icon caches.

CVE-2020-9773: Chilik Tamir of Zimperium zLabs

Image Processing

Available for: Apple TV 4K and Apple TV HD

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

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

CVE-2020-9768: Mohamed Ghannam (@_simo36)

IOHIDFamily

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 memory initialization issue was addressed with improved memory handling.

CVE-2020-3919: an anonymous researcher

Kernel

Available for: Apple TV 4K and Apple TV HD

Impact: An application may be able to read restricted memory

Description: A memory initialization issue was addressed with improved memory handling.

CVE-2020-3914: pattern-f (@pattern_F_) of WaCai

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: Multiple memory corruption issues were addressed with improved state management.

CVE-2020-9785: Proteas of Qihoo 360 Nirvan Team

libxml2

Available for: Apple TV 4K and Apple TV HD

Impact: Multiple issues in libxml2

Description: A buffer overflow was addressed with improved bounds checking.

CVE-2020-3909: LGTM.com

CVE-2020-3911: found by OSS-Fuzz

libxml2

Available for: Apple TV 4K and Apple TV HD

Impact: Multiple issues in libxml2

Description: A buffer overflow was addressed with improved size validation.

CVE-2020-3910: LGTM.com

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 memory handling.

CVE-2020-3895: grigoritchy

CVE-2020-3900: Dongzhuo Zhao working with ADLab of Venustech

WebKit

Available for: Apple TV 4K and Apple TV HD

Impact: An application may be able to read restricted memory

Description: A race condition was addressed with additional validation.

CVE-2020-3894: Sergei Glazunov of Google Project Zero

WebKit

Available for: Apple TV 4K and Apple TV HD

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

Description: A memory consumption issue was addressed with improved memory handling.

CVE-2020-3899: found by OSS-Fuzz

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-2020-3902: Yiğit Can YILMAZ (@yilmazcanyigit)

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 memory handling.

CVE-2020-3901: Benjamin Randazzo (@____benjamin)

WebKit

Available for: Apple TV 4K and Apple TV HD

Impact: A download's origin may be incorrectly associated

Description: A logic issue was addressed with improved restrictions.

CVE-2020-3887: Ryan Pickren (ryanpickren.com)

WebKit

Available for: Apple TV 4K and Apple TV HD

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

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

CVE-2020-9783: Apple

WebKit

Available for: Apple TV 4K and Apple TV HD

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

Description: A type confusion issue was addressed with improved memory handling.

CVE-2020-3897: Brendan Draper (@6r3nd4n) working with Trend Micro’s Zero Day Initiative

WebKit Page Loading

Available for: Apple TV 4K and Apple TV HD

Impact: A file URL may be incorrectly processed

Description: A logic issue was addressed with improved restrictions.

CVE-2020-3885: Ryan Pickren (ryanpickren.com)

Additional recognition

FontParser

We would like to acknowledge Matthew Denton of Google Chrome for their assistance.

Kernel

We would like to acknowledge Siguza for their assistance.

LinkPresentation

We would like to acknowledge Travis for their assistance.

WebKit

We would like to acknowledge Emilio Cobos Álvarez of Mozilla, Samuel Groß of Google Project Zero, and an anonymous researcher for their assistance.

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