About the security content of tvOS 13.3.1

This document describes the security content of tvOS 13.3.1.

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.

tvOS 13.3.1

Audio

Available for: Apple TV 4K and Apple TV HD

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

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

CVE-2020-3857: Zhuo Liang of Qihoo 360 Vulcan Team

files

Available for: Apple TV 4K and Apple TV HD

Impact: A malicious application may be able to overwrite arbitrary files

Description: an access issue was addressed with improved access restrictions.

CVE-2020-3855: Csaba Fitzl (@theevilbit)

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-2020-3826: Samuel Groß of Google Project Zero

CVE-2020-3870

CVE-2020-3878: Samuel Groß of Google Project Zero

CVE-2020-3880: Samuel Groß of Google Project Zero

IOAcceleratorFamily

Available for: Apple TV 4K and Apple TV HD

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

Description: a memory corruption issue was addressed with improved memory handling.

CVE-2020-3837: Brandon Azad of Google Project Zero

IOUSBDeviceFamily

Available for: Apple TV 4K and Apple TV HD

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

Description: a memory corruption issue was addressed with improved memory handling.

CVE-2019-8836: Xiaolong Bai and Min (Spark) Zheng of Alibaba Inc. and Luyi Xing of Indiana University Bloomington

IPSec

Available for: Apple TV 4K and Apple TV HD

Impact: Loading a maliciously crafted racoon configuration file may lead to arbitrary code execution

Description: An off by one issue existed in the handling of racoon configuration files. This issue was addressed through improved bounds checking.

CVE-2020-3840: @littlelailo

Kernel

Available for: Apple TV 4K and Apple TV HD

Impact: An application may be able to read restricted memory

Description: a validation issue was addressed with improved input sanitisation.

CVE-2020-3875: Brandon Azad of Google Project Zero

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-2020-3872: Haakon Garseg Mørk of Cognite and Cim Stordal of Cognite

Kernel

Available for: Apple TV 4K and Apple TV HD

Impact: a malicious application may be able to determine kernel memory layout

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

CVE-2020-3836: Brandon Azad of Google Project Zero

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 memory corruption issue was addressed with improved memory handling.

CVE-2020-3842: Ned Williamson working with Google Project Zero

Kernel

Available for: Apple TV 4K and Apple TV HD

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

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

CVE-2020-3853: Brandon Azad of Google Project Zero

libxml2

Available for: Apple TV 4K and Apple TV HD

Impact: Processing maliciously crafted XML may lead to an unexpected application termination or arbitrary code execution

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

CVE-2020-3846: Ranier Vilela

libxpc

Available for: Apple TV 4K and Apple TV HD

Impact: processing a maliciously crafted string may lead to heap corruption

Description: a memory corruption issue was addressed with improved input validation.

CVE-2020-3856: Ian Beer of Google Project Zero

libxpc

Available for: Apple TV 4K and Apple TV HD

Impact: An application may be able to gain elevated privileges

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

CVE-2020-3829: Ian Beer of Google Project Zero

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-2020-3825: Przemysław Sporysz of Euvic

CVE-2020-3868: Marcin Towalski of Cisco Talos

WebKit

Available for: Apple TV 4K and Apple TV HD

Impact: A malicious website may be able to cause a denial of service

Description: A denial of service issue was addressed with improved memory handling.

CVE-2020-3862: Srikanth Gatta of Google Chrome

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-2020-3867: an anonymous researcher

WebKit Page Loading

Available for: Apple TV 4K and Apple TV HD

Impact: A top-level DOM object context may have incorrectly been considered secure

Description: a logic issue was addressed with improved validation.

CVE-2020-3865: Ryan Pickren (ryanpickren.com)

WebKit Page Loading

Available for: Apple TV 4K and Apple TV HD

Impact: A DOM object context may not have had a unique security origin

Description: a logic issue was addressed with improved validation.

CVE-2020-3864: Ryan Pickren (ryanpickren.com)

wifivelocityd

Available for: Apple TV 4K and Apple TV HD

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

Description: the issue was addressed with improved permissions logic.

CVE-2020-3838: Dayton Pidhirney (@_watbulb)

Additional recognition

IOSurface

We would like to acknowledge Liang Chen (@chenliang0817) for their assistance.