About the security content of tvOS 12.1

This document describes the security content of tvOS 12.1.

About Apple security updates

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

For more information about security, see the Apple Product Security page. You can encrypt communications with Apple using the Apple Product Security PGP Key.

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

tvOS 12.1

CoreCrypto

Available for: Apple TV 4K and Apple TV (4th generation)

Impact: An attacker may be able to exploit a weakness in the Miller-Rabin primality test to incorrectly identify prime numbers

Description: An issue existed in the method for determining prime numbers. This issue was addressed by using pseudorandom bases for testing of primes.

CVE-2018-4398: Martin Albrecht, Jake Massimo and Kenny Paterson of Royal Holloway, University of London, and Juraj Somorovsky of Ruhr University, Bochum

ICU

Available for: Apple TV 4K and Apple TV (4th generation)

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

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

CVE-2018-4394: Erik Verbruggen of The Qt Company

IPSec

Available for: Apple TV 4K and Apple TV (4th generation)

Impact: An application may be able to gain elevated privileges

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

CVE-2018-4371: Tim Michaud (@TimGMichaud) of Leviathan Security Group

Kernel

Available for: Apple TV 4K and Apple TV (4th generation)

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

Description: A memory corruption issue was addressed by removing the vulnerable code.

CVE-2018-4420: Mohamed Ghannam (@_simo36)

Kernel

Available for: Apple TV 4K and Apple TV (4th generation)

Impact: An application may be able to read restricted memory

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

CVE-2018-4413: Juwei Lin (@panicaII) of TrendMicro Mobile Security Team

Kernel

Available for: Apple TV 4K and Apple TV (4th generation)

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-2018-4419: Mohamed Ghannam (@_simo36)

Mail

Available for: Apple TV 4K and Apple TV (4th generation)

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

Description: A resource exhaustion issue was addressed with improved input validation.

CVE-2018-4381: Angel Ramirez

NetworkExtension

Available for: Apple TV 4K and Apple TV (4th generation)

Impact: Connecting to a VPN server may leak DNS queries to a DNS proxy

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

CVE-2018-4369: an anonymous researcher

WebKit

Available for: Apple TV 4K and Apple TV (4th generation)

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

Description: Multiple memory corruption issues were addressed with improved memory handling.

CVE-2018-4372: HyungSeok Han, DongHyeon Oh, and Sang Kil Cha of KAIST Softsec Lab, Korea

CVE-2018-4382: lokihardt of Google Project Zero

CVE-2018-4386: lokihardt of Google Project Zero

CVE-2018-4392: zhunki of 360 ESG Codesafe Team

CVE-2018-4416: lokihardt of Google Project Zero

WebKit

Available for: Apple TV 4K and Apple TV (4th generation)

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

Description: A resource exhaustion issue was addressed with improved input validation.

CVE-2018-4409: Sabri Haddouche (@pwnsdx) of Wire Swiss GmbH

WebKit

Available for: Apple TV 4K and Apple TV (4th generation)

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

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

CVE-2018-4378: HyungSeok Han, DongHyeon Oh, and Sang Kil Cha of KAIST Softsec Lab, Korea, zhunki of 360 ESG Codesafe Team

WiFi

Available for: Apple TV 4K and Apple TV (4th generation)

Impact: An attacker in a privileged position may be able to perform a denial of service attack

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

CVE-2018-4368: Milan Stute and Alex Mariotto of Secure Mobile Networking Lab at Technische Universität Darmstadt

Additional recognition

Certificate Signing

We would like to acknowledge Yiğit Can YILMAZ (@yilmazcanyigit) for their assistance.

coreTLS

We would like to acknowledge Eyal Ronen (Weizmann Institute), Robert Gillham (University of Adelaide), Daniel Genkin (University of Michigan), Adi Shamir (Weizmann Institute), David Wong (NCC Group), and Yuval Yarom (University of Adelaide and Data61) for their assistance.

Security

We would like to acknowledge Marinos Bernitsas of Parachute for their assistance.