About the security content of tvOS 13.4

This document describes the security content of tvOS 13.4.

About Apple security updates

For our customers' protection, Apple doesn't disclose, discuss or confirm security issues until an investigation has taken place and patches or releases are available. Recent releases are listed on the Apple security updates page.

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

For more information about security, see the Apple Product Security page.

This document describes the security content of tvOS 13.4

Accounts

Available for: Apple TV 4K and Apple TV HD

Impact: A sandboxed process may be able to circumvent sandbox restrictions

Description: A logic issue was addressed with improved restrictions.

CVE-2020-9772: Allison Husain of UC Berkeley

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)

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 initialisation issue was addressed with improved memory handling.

CVE-2020-3919: Alex Plaskett of F-Secure Consulting

Kernel

Available for: Apple TV 4K and Apple TV HD

Impact: An application may be able to read restricted memory

Description: A memory initialisation 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

Sandbox

Available for: Apple TV 4K and Apple TV HD

Impact: A local user may be able to view sensitive user information

Description: An access issue was addressed with additional sandbox restrictions.

CVE-2020-3918: Augusto Alvarez of Outcourse Limited

WebKit

Available for: Apple TV 4K and Apple TV HD

Impact: Some websites may not have appeared in Safari Preferences

Description: A logic issue was addressed with improved restrictions.

CVE-2020-9787: Ryan Pickren (ryanpickren.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 and Samuel Groß of Google Project Zero, hearmen for their assistance.