About the security content of tvOS 11.2

This document describes the security content of tvOS 11.2.

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tvOS 11.2

Released December 4, 2017

App Store

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

Impact: An attacker in a privileged network position may be able to spoof password prompts in App Store

Description: An input validation issue was addressed through improved input validation.

CVE-2017-7164: Jerry Decime

Entry added January 11, 2018

CFNetwork Session

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

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-2017-7172: Richard Zhu (fluorescence) working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

CoreAnimation

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

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

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

CVE-2017-7171: 360 Security working with Trend Micro's Zero Day Initiative, and Tencent Keen Security Lab (@keen_lab) working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

IOKit

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-2017-7162: Tencent Keen Security Lab (@keen_lab) working with Trend Micro's Zero Day Initiative

Entry added December 21, 2017, updated January 10, 2018

IOSurface

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-2017-13861: Ian Beer of Google Project Zero

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-2017-13904: Kevin Backhouse of Semmle Ltd.

Entry added February 14, 2018

Kernel

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

Impact: An application may be able to read kernel memory (Meltdown)

Description: Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis of the data cache.

CVE-2017-5754: Jann Horn of Google Project Zero; Moritz Lipp of Graz University of Technology; Michael Schwarz of Graz University of Technology; Daniel Gruss of Graz University of Technology; Thomas Prescher of Cyberus Technology GmbH; Werner Haas of Cyberus Technology GmbH; Stefan Mangard of Graz University of Technology; Paul Kocher; Daniel Genkin of University of Pennsylvania and University of Maryland; Yuval Yarom of University of Adelaide and Data61; and Mike Hamburg of Rambus (Cryptography Research Division)

Entry added January 4, 2018, updated January 10, 2018

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-2017-13862: Apple

CVE-2017-13867: Ian Beer of Google Project Zero

CVE-2017-13876: Ian Beer of Google Project Zero

Entry updated December 21, 2017

Kernel

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

Impact: An application may be able to read restricted memory

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

CVE-2017-13833: Brandon Azad

Kernel

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

Impact: An application may be able to read restricted memory

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

CVE-2017-13855: Jann Horn of Google Project Zero

Kernel

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

Impact: An application may be able to read restricted memory

Description: Multiple validation issues were addressed with improved input sanitization.

CVE-2017-13865: Ian Beer of Google Project Zero

CVE-2017-13868: Brandon Azad

CVE-2017-13869: Jann Horn of Google Project Zero

Kernel

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

Impact: A local user may be able to cause unexpected system termination or read kernel memory

Description: An input validation issue existed in the kernel. This issue was addressed through improved input validation.

CVE-2017-7154: Jann Horn of Google Project Zero

Entry added December 21, 2017

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-2017-13885: 360 Security working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

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 through improved memory handling.

CVE-2017-7165: 360 Security working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

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-2017-13884: 360 Security working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

WebKit

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

Impact: Visiting a malicious website may lead to user interface spoofing

Description: Redirect responses to 401 Unauthorized may allow a malicious website to incorrectly display the lock icon on mixed content. This issue was addressed through improved URL display logic.

CVE-2017-7153: Jerry Decime

Entry added January 11, 2018

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-2017-7156: Yuan Deng of Ant-financial Light-Year Security Lab

CVE-2017-7157: an anonymous researcher

CVE-2017-13856: Jeonghoon Shin

CVE-2017-13870: Tencent Keen Security Lab (@keen_lab) working with Trend Micro's Zero Day Initiative

CVE-2017-7160: Richard Zhu (fluorescence) working with Trend Micro's Zero Day Initiative

CVE-2017-13866: Tencent Keen Security Lab (@keen_lab) working with Trend Micro's Zero Day Initiative

Entry updated January 10, 2018

Wi-Fi

Available for: Apple TV (4th generation)
Released for Apple TV 4K in tvOS 11.1.

Impact: An attacker in Wi-Fi range may force nonce reuse in WPA multicast/GTK clients (Key Reinstallation Attacks - KRACK)

Description: A logic issue existed in the handling of state transitions. This was addressed with improved state management.

CVE-2017-13080: Mathy Vanhoef of the imec-DistriNet group at KU Leuven

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