About the security content of iOS 11.3

This document describes the security content of iOS 11.3.

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.

iOS 11.3

Released March 29, 2018

Apple TV App

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

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

CVE-2018-4177: Jerry Decime

Entry added April 13, 2018

Clock

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: A person with physical access to an iOS device may be able to see the email address used for iTunes

Description: An information disclosure issue existed in the handling of alarms and timers. This issue was addressed with improved access restrictions.

CVE-2018-4123: Zaheen Hafzar M M (@zaheenhafzer)

Entry updated November 16, 2018

CoreFoundation

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An application may be able to gain elevated privileges

Description: A race condition was addressed with additional validation.

CVE-2018-4155: Samuel Groß (@5aelo)

CVE-2018-4158: Samuel Groß (@5aelo)

CoreText

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

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

CVE-2018-4142: Robin Leroy of Google Switzerland GmbH

Entry updated November 16, 2018

LinkPresentation

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

Description: An inconsistent user interface issue was addressed with improved state management.

CVE-2018-4390: Rayyan Bijoora (@Bijoora) of The City School, PAF Chapter

CVE-2018-4391: Rayyan Bijoora (@Bijoora) of The City School, PAF Chapter

Entry added October 30, 2018, updated November 16, 2018

File System Events

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An application may be able to gain elevated privileges

Description: A race condition was addressed with additional validation.

CVE-2018-4167: Samuel Groß (@5aelo)

Files Widget

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: File Widget may display contents on a locked device

Description: The File Widget was displaying cached data when in the locked state. This issue was addressed with improved state management.

CVE-2018-4168: Brandon Moore

Find My iPhone

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: A person with physical access to the device may be able to disable Find My iPhone without entering an iCloud password

Description: A state management issue existed when restoring from a back up. This issue was addressed through improved state checking during restore.

CVE-2018-4172: Viljami Vastamäki

iCloud Drive

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An application may be able to gain elevated privileges

Description: A race condition was addressed with additional validation.

CVE-2018-4151: Samuel Groß (@5aelo)

Kernel

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

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

CVE-2018-4150: an anonymous researcher

Kernel

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An application may be able to read restricted memory

Description: A validation issue was addressed with improved input sanitization.

CVE-2018-4104: The UK's National Cyber Security Centre (NCSC)

Kernel

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th 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-2018-4143: derrek (@derrekr6)

Kernel

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

Description: An information disclosure issue existed in the transition of program state. This issue was addressed with improved state handling.

CVE-2018-4185: Brandon Azad

Entry added July 19, 2018

libxml2

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash

Description: A use after free issue was addressed with improved memory management.

CVE-2017-15412: Nick Wellnhofer

Entry added October 18, 2018

LinkPresentation

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

Description: An inconsistent user interface issue was addressed with improved state management.

CVE-2018-4390: Rayyan Bijoora (@Bijoora) of The City School, PAF Chapter

CVE-2018-4391: Rayyan Bijoora (@Bijoora) of The City School, PAF Chapter

Entry added October 30, 2018

Mail

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An attacker in a privileged network position may be able to intercept the contents of S/MIME-encrypted e-mail

Description: An inconsistent user interface issue was addressed with improved state management.

CVE-2018-4174: John McCombs of Integrated Mapping Ltd, McClain Looney of LoonSoft Inc.

Entry updated April 13, 2018

NSURLSession

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An application may be able to gain elevated privileges

Description: A race condition was addressed with additional validation.

CVE-2018-4166: Samuel Groß (@5aelo)

PluginKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An application may be able to gain elevated privileges

Description: A race condition was addressed with additional validation.

CVE-2018-4156: Samuel Groß (@5aelo)

Quick Look

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An application may be able to gain elevated privileges

Description: A race condition was addressed with additional validation.

CVE-2018-4157: Samuel Groß (@5aelo)

Safari

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

Description: An inconsistent user interface issue was addressed with improved state management.

CVE-2018-4134: xisigr of Tencent's Xuanwu Lab (tencent.com), Zhiyang Zeng (@Wester) of Tencent Security Platform Department

Safari Login AutoFill

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: A malicious website may be able to exfiltrate autofilled data in Safari without explicit user interaction.

Description: Safari autofill did not require explicit user interaction before taking place. The issue was addressed with improved autofill heuristics.

CVE-2018-4137

Entry updated November 16, 2018

SafariViewController

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

Description: A state management issue was addressed by disabling text input until the destination page loads.

CVE-2018-4149: Abhinash Jain (@abhinashjain)

Security

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: A malicious application may be able to elevate privileges

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

CVE-2018-4144: Abraham Masri (@cheesecakeufo)

Status Bar

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: A malicious application may be able to access the microphone without indication to the user

Description: A consistency issue existed in deciding when to show the microphone use indicator. The issue was resolved with improved capability validation.

CVE-2018-4173: Joshua Pokotilow of pingmd

Entry added April 9, 2018

Storage

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An application may be able to gain elevated privileges

Description: A race condition was addressed with additional validation.

CVE-2018-4154: Samuel Groß (@5aelo)

System Preferences

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: A configuration profile may incorrectly remain in effect after removal

Description: An issue existed in CFPreferences. This issue was addressed with improved preferences cleanup.

CVE-2018-4115: Johann Thalakada, Vladimir Zubkov, and Matt Vlasach of Wandera

Entry updated November 16, 2018

Telephony

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: A remote attacker can cause a device to unexpectedly restart

Description: A null pointer dereference issue existed when handling Class 0 SMS messages. This issue was addressed with improved message validation.

CVE-2018-4140: @mjonsson, Arjan van der Oest of Voiceworks BV

Entry updated November 16, 2018

Telephony

Available for: iPhone 5s and later, and WiFi + Cellular models of iPad Air and later

Impact: A remote attacker may be able to execute arbitrary code

Description: Multiple buffer overflows were addressed with improved input validation.

CVE-2018-4148: Nico Golde of Comsecuris UG

Entry added March 30, 2018

Web App

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Cookies may unexpectedly persist in web app

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

CVE-2018-4110: Ben Compton and Jason Colley of Cerner Corporation

Entry updated November 16, 2018

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th 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-2018-4101: Yuan Deng of Ant-financial Light-Year Security Lab

CVE-2018-4114: found by OSS-Fuzz

CVE-2018-4118: Jun Kokatsu (@shhnjk)

CVE-2018-4119: an anonymous researcher working with Trend Micro's Zero Day Initiative

CVE-2018-4120: Hanming Zhang (@4shitak4) of Qihoo 360 Vulcan Team

CVE-2018-4121: Natalie Silvanovich of Google Project Zero

CVE-2018-4122: WanderingGlitch of Trend Micro’s Zero Day Initiative

CVE-2018-4125: WanderingGlitch of Trend Micro's Zero Day Initiative

CVE-2018-4127: an anonymous researcher working with Trend Micro's Zero Day Initiative

CVE-2018-4128: Zach Markley

CVE-2018-4129: likemeng of Baidu Security Lab working with Trend Micro's Zero Day Initiative

CVE-2018-4130: Omair working with Trend Micro's Zero Day Initiative

CVE-2018-4161: WanderingGlitch of Trend Micro's Zero Day Initiative

CVE-2018-4162: WanderingGlitch of Trend Micro's Zero Day Initiative

CVE-2018-4163: WanderingGlitch of Trend Micro's Zero Day Initiative

CVE-2018-4165: Hanming Zhang (@4shitak4) of Qihoo 360 Vulcan Team

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Unexpected interaction with indexing types causing an ASSERT failure

Description: An array indexing issue existed in the handling of a function in javascript core. This issue was addressed through improved checks

CVE-2018-4113: found by OSS-Fuzz

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

Description: A memory corruption issue was addressed through improved input validation

CVE-2018-4146: found by OSS-Fuzz

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: A malicious website may exfiltrate data cross-origin

Description: A cross-origin issue existed with the fetch API. This was addressed through improved input validation.

CVE-2018-4117: an anonymous researcher, an anonymous researcher

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Unexpected interaction causes an ASSERT failure

Description: This issue was addressed with improved checks.

CVE-2018-4207: found by OSS-Fuzz

Entry added May 2, 2018

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Unexpected interaction causes an ASSERT failure

Description: This issue was addressed with improved checks.

CVE-2018-4208: found by OSS-Fuzz

Entry added May 2, 2018

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Unexpected interaction causes an ASSERT failure

Description: This issue was addressed with improved checks.

CVE-2018-4209: found by OSS-Fuzz

Entry added May 2, 2018

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Unexpected interaction with indexing types caused a failure

Description: An array indexing issue existed in the handling of a function in javascript core. This issue was addressed with improved checks.

CVE-2018-4210: found by OSS-Fuzz

Entry added May 2, 2018

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Unexpected interaction causes an ASSERT failure

Description: This issue was addressed with improved checks.

CVE-2018-4212: found by OSS-Fuzz

Entry added May 2, 2018

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: Unexpected interaction causes an ASSERT failure

Description: This issue was addressed with improved checks.

CVE-2018-4213: found by OSS-Fuzz

Entry added May 2, 2018

WebKit

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

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

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

CVE-2018-4145: found by OSS-Fuzz

Entry added October 18, 2018

WindowServer

Available for: iPhone 5s and later, iPad Air and later, and iPod touch 6th generation

Impact: An unprivileged application may be able to log keystrokes entered into other applications even when secure input mode is enabled

Description: By scanning key states, an unprivileged application could log keystrokes entered into other applications even when secure input mode was enabled. This issue was addressed by improved state management.

CVE-2018-4131: Andreas Hegenberg of folivora.AI GmbH

Additional recognition

Mail

We would like to acknowledge Sabri Haddouche (@pwnsdx) from Wire Swiss GmbH for their assistance.

Entry added June 21, 2018

Security

We would like to acknowledge Abraham Masri (@cheesecakeufo) for their assistance.

Entry added April 13, 2018

WebKit

We would like to acknowledge Johnny Nipper of Tinder Security Team for their assistance.

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