About the security content of watchOS 4.2

This document describes the security content of watchOS 4.2.

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watchOS 4.2

Released December 5, 2017

IOSurface

Available for: All Apple Watch models

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: All Apple Watch models

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-2017-13876: Ian Beer of Google Project Zero

Kernel

Available for: All Apple Watch models

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: All Apple Watch models

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: All Apple Watch models

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-2017-13867: Ian Beer of Google Project Zero

Kernel

Available for: All Apple Watch models

Impact: An application may be able to read restricted memory

Description: A validation issue was 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

Wi-Fi

Available for: Apple Watch (1st Generation) and Apple Watch Series 3
Released for Apple Watch Series 1 and Apple Watch Series 2 in watchOS 4.1.

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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