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
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
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)
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
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
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 sanitisation.
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
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
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
LinkPresentation
Available for: iPhone 5s and later, iPad Air and later and iPod touch 6th generation
Impact: Processing a maliciously crafted text message may lead to UI spoofing
Description: A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.
CVE-2018-4187: Roman Mueller (@faker_), Zhiyang Zeng (@Wester) of Tencent Security Platform Department
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.
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
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
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
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
Telephony
Available for: iPhone 5s and later, and Wi-Fi + 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
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
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
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
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
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
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
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
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
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
We would like to acknowledge Sabri Haddouche (@pwnsdx) from Wire Swiss GmbH for their assistance.
Security
We would like to acknowledge Abraham Masri (@cheesecakeufo) for their assistance.
WebKit
We would like to acknowledge Johnny Nipper of Tinder Security Team for their assistance.
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