About the security content of macOS High Sierra 10.13.6, Security Update 2018-004 Sierra, Security Update 2018-004 El Capitan

This document describes the security content of macOS High Sierra 10.13.6, Security Update 2018-004 Sierra, Security Update 2018-004 El Capitan.

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.

macOS High Sierra 10.13.6, Security Update 2018-004 Sierra, Security Update 2018-004 El Capitan

Accounts

Available for: macOS High Sierra 10.13.5

Impact: A malicious application may be able to access local users’ Apple IDs

Description: A privacy issue in the handling of Open Directory records was addressed with improved indexing.

CVE-2018-4470: Jacob Greenfield of Commonwealth School

AMD

Available for: macOS High Sierra 10.13.5

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

Description: An information disclosure issue was addressed by removing the vulnerable code.

CVE-2018-4289: shrek_wzw of Qihoo 360 Nirvan Team

APFS

Available for: macOS High Sierra 10.13.5

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-2018-4268: Mac working with Trend Micro's Zero Day Initiative

ATS

Available for: macOS High Sierra 10.13.5

Impact: A malicious application may be able to gain root privileges

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

CVE-2018-4285: Mohamed Ghannam (@_simo36)

Bluetooth

Available for: MacBook Pro (15-inch, 2018) and MacBook Pro (13-inch, 2018, Four Thunderbolt 3 Ports)

Impact: An attacker in a privileged network position may be able to intercept bluetooth traffic

Description: An input validation issue existed in bluetooth. This issue was addressed with improved input validation.

CVE-2018-5383: Lior Neumann and Eli Biham

CFNetwork

Available for: macOS High Sierra 10.13.5

Impact: Cookies may unexpectedly persist in Safari

Description: A cookie management issue was addressed with improved checks.

CVE-2018-4293: an anonymous researcher

CoreCrypto

Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6

Impact: A malicious application may be able to break out of its sandbox

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

CVE-2018-4269: Abraham Masri (@cheesecakeufo)

CUPS

Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, macOS High Sierra 10.13.5

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

Description: A null pointer dereference was addressed with improved validation.

CVE-2018-4276: Jakub Jirasek of Secunia Research at Flexera

DesktopServices

Available for: macOS Sierra 10.12.6

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

Description: A permissions issue existed in which execute permission was incorrectly granted. This issue was addressed with improved permission validation.

CVE-2018-4178: Arjen Hendrikse

Intel Graphics Driver

Available for: macOS High Sierra 10.13.5

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

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

CVE-2018-4456: Tyler Bohan of Cisco Talos

IOGraphics

Available for: macOS High Sierra 10.13.5

Impact: A local user may be able to read kernel memory

Description: An out-of-bounds read issue existed that led to the disclosure of kernel memory. This was addressed with improved input validation.

CVE-2018-4283: @panicaII working with Trend Micro's Zero Day Initiative

Kernel

Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, macOS High Sierra 10.13.5

Impact: Systems using Intel® Core-based microprocessors may potentially allow a local process to infer data utilising Lazy FP state restore from another process through a speculative execution side channel

Description: Lazy FP state restore instead of eager save and restore of the state upon a context switch. Lazy restored states are potentially vulnerable to exploits where one process may infer register values of other processes through a speculative execution side channel that infers their value.

An information disclosure issue was addressed with FP/SIMD register state sanitisation.

CVE-2018-3665: Julian Stecklina of Amazon Germany, Thomas Prescher of Cyberus Technology GmbH (cyberus-technology.de), Zdenek Sojka of SYSGO AG (sysgo.com) and Colin Percival

Kernel

Available for: macOS High Sierra 10.13.5

Impact: Mounting a maliciously crafted NFS network share may lead to arbitrary code execution with system privileges

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

CVE-2018-4259: Kevin Backhouse of Semmle and LGTM.com

CVE-2018-4286: Kevin Backhouse of Semmle and LGTM.com

CVE-2018-4287: Kevin Backhouse of Semmle and LGTM.com

CVE-2018-4288: Kevin Backhouse of Semmle and LGTM.com

CVE-2018-4291: Kevin Backhouse of Semmle and LGTM.com

libxpc

Available for: OS X El Capitan 10.11.6, macOS Sierra 10.12.6, macOS High Sierra 10.13.5

Impact: An application may be able to gain elevated privileges

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

CVE-2018-4280: Brandon Azad

libxpc

Available for: macOS High Sierra 10.13.5

Impact: A malicious application may be able to read restricted memory

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

CVE-2018-4248: Brandon Azad

LinkPresentation

Available for: macOS High Sierra 10.13.5

Impact: Visiting a malicious website may lead to address bar spoofing

Description: A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.

CVE-2018-4277: xisigr of Tencent's Xuanwu Lab (tencent.com)

Perl

Available for: macOS High Sierra 10.13.5

Impact: Multiple buffer overflow issues existed in Perl

Description: Multiple issues in Perl were addressed with improved memory handling.

CVE-2018-6797: Brian Carpenter

CVE-2018-6913: GwanYeong Kim

Ruby

Available for: macOS High Sierra 10.13.5

Impact: A remote attacker may be able to cause unexpected application termination or arbitrary code execution

Description: Multiple issues in Ruby were addressed in this update.

CVE-2017-0898

CVE-2017-10784

CVE-2017-14033

CVE-2017-14064

CVE-2017-17405

CVE-2017-17742

CVE-2018-6914

CVE-2018-8777

CVE-2018-8778

CVE-2018-8779

CVE-2018-8780

WebKit

Available for: macOS High Sierra 10.13.5

Impact: Visiting a malicious website may lead to address bar spoofing

Description: A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.

CVE-2018-4274: Tomasz Bojarski

Additional recognition

App Store

We would like to acknowledge Jesse Endahl & Stevie Hryciw of Fleetsmith, and Max Bélanger of Dropbox, for their assistance.

Help Viewer

We would like to acknowledge Wojciech Reguła (@_r3ggi) of SecuRing for their assistance with four mitigations.

Kernel

We would like to acknowledge juwei lin (@panicaII) of Trend Micro working with Trend Micro’s Zero Day Initiative for their assistance.

Security

We would like to acknowledge Brad Dahlsten of Iowa State University for their assistance.