About the security content of iOS 11.4

This document describes the security content of iOS 11.4.

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 11.4

Released May 29, 2018

Bluetooth

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-2018-4215: Abraham Masri (@cheesecakeufo)

Bluetooth

Available for: iPhone X, iPhone 8, iPhone 8 Plus, iPad 6th generation, and iPad Air 2

Not impacted: HomePod

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

Entry added July 23, 2018

Contacts

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

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

Description: A validation issue existed in the handling of phone numbers. This issue was addressed with improved validation of phone numbers.

CVE-2018-4100: Abraham Masri (@cheesecakeufo)

CoreGraphics

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

CVE-2018-4194: Jihui Lu of Tencent KeenLab, Yu Zhou of Ant-financial Light-Year Security Lab

Entry added June 21, 2018

Core Bluetooth

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 system privileges

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

CVE-2018-4330: Apple

Entry added August 8, 2018

FontParser

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

Impact: Processing a maliciously crafted font file may lead to arbitrary code execution

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

CVE-2018-4211: Proteas of Qihoo 360 Nirvan Team

iBooks

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 iBooks

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

CVE-2018-4202: Jerry Decime

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 buffer overflow was addressed with improved bounds checking.

CVE-2018-4241: Ian Beer of Google Project Zero

CVE-2018-4243: Ian Beer of Google Project Zero

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-2018-4249: Kevin Backhouse of Semmle Ltd.

libxpc

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 logic issue was addressed with improved validation.

CVE-2018-4237: Samuel Groß (@5aelo) working with Trend Micro’s Zero Day Initiative

libxpc

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 system privileges

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

CVE-2018-4404: Samuel Groß (@5aelo) working with Trend Micro’s Zero Day Initiative

Entry added October 30, 2018

Magnifier

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 view the last image used in Magnifier from the lockscreen

Description: A permissions issue existed in Magnifier.  This was addressed with additional permission checks.

CVE-2018-4239: an anonymous researcher

Mail

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

Impact: An attacker may be able to exfiltrate the contents of S/MIME-encrypted e-mail

Description: An issue existed in the handling of encrypted Mail. This issue was addressed with improved isolation of MIME in Mail.

CVE-2018-4227: Damian Poddebniak of Münster University of Applied Sciences, Christian Dresen of Münster University of Applied Sciences, Jens Müller of Ruhr University Bochum, Fabian Ising of Münster University of Applied Sciences, Sebastian Schinzel of Münster University of Applied Sciences, Simon Friedberger of KU Leuven, Juraj Somorovsky of Ruhr University Bochum, Jörg Schwenk of Ruhr University Bochum

Messages

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

Impact: A local user may be able to conduct impersonation attacks

Description: An injection issue was addressed with improved input validation.

CVE-2018-4235: Anurodh Pokharel of Salesforce.com

Messages

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

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

Description: This issue was addressed with improved message validation.

CVE-2018-4240: Sriram (@Sri_Hxor) of PrimeFort Pvt. Ltd

CVE-2018-4250: Metehan Yılmaz of Sesim Sarpkaya

Safari

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

Impact: A malicious website may be able to cause a denial of service

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

CVE-2018-4247: François Renaud, Jesse Viviano of Verizon Enterprise Solutions

Security

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

Impact: Users may be tracked by malicious websites using client certificates

Description: An issue existed in the handling of S-MIME certificates. This issue was addressed with improved validation of S-MIME certificates.

CVE-2018-4221: Damian Poddebniak of Münster University of Applied Sciences, Christian Dresen of Münster University of Applied Sciences, Jens Müller of Ruhr University Bochum, Fabian Ising of Münster University of Applied Sciences, Sebastian Schinzel of Münster University of Applied Sciences, Simon Friedberger of KU Leuven, Juraj Somorovsky of Ruhr University Bochum, Jörg Schwenk of Ruhr University Bochum

Security

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

Impact: A local user may be able to read a persistent account identifier

Description: An authorization issue was addressed with improved state management.

CVE-2018-4223: Abraham Masri (@cheesecakeufo)

Security

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

Impact: A local user may be able to read a persistent device identifier

Description: An authorization issue was addressed with improved state management.

CVE-2018-4224: Abraham Masri (@cheesecakeufo)

Security

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

Impact: A local user may be able to modify the state of the Keychain

Description: An authorization issue was addressed with improved state management.

CVE-2018-4225: Abraham Masri (@cheesecakeufo)

Security

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

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

Description: An authorization issue was addressed with improved state management.

CVE-2018-4226: Abraham Masri (@cheesecakeufo)

Siri

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 enable Siri from the lock screen

Description: An issue existed with Siri permissions. This was addressed with improved permission checking.

CVE-2018-4238: Baljinder Singh, Muhammad khizer javed, Onur Can BIKMAZ (@CanBkmaz) of Mustafa Kemal University

Siri

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 use Siri to read notifications of content that is set not to be displayed at the lock screen

Description: An issue existed with Siri permissions. This was addressed with improved permission checking.

CVE-2018-4252: Hunter Byrnes, Martin Winkelmann (@Winkelmannnn)

Siri Contacts

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

Impact: An attacker with physical access to a device may be able to see private contact information

Description: An issue existed with Siri permissions. This was addressed with improved permission checking.

CVE-2018-4244: an anonymous researcher

UIKit

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

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

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

CVE-2018-4198: Hunter Byrnes

WebKit

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-2018-4188: YoKo Kho (@YoKoAcc) of Mitra Integrasi Informatika, PT

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-2018-4201: an anonymous researcher

CVE-2018-4218: Natalie Silvanovich of Google Project Zero

CVE-2018-4233: Samuel Groß (@5aelo) working with Trend Micro’s Zero Day Initiative

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: A buffer overflow issue was addressed with improved memory handling.

CVE-2018-4199: Alex Plaskett, Georgi Geshev, and Fabi Beterke of MWR Labs working with Trend Micro’s Zero Day Initiative

Entry updated June 14, 2018

WebKit

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

Impact: Visiting a maliciously crafted website may lead to cookies being overwritten

Description: A permissions issue existed in the handling of web browser cookies. This issue was addressed with improved restrictions.

CVE-2018-4232: an anonymous researcher, Aymeric Chaib

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: A race condition was addressed with improved locking.

CVE-2018-4192: Markus Gaasedelen, Nick Burnett, and Patrick Biernat of Ret2 Systems, Inc working with Trend Micro’s Zero Day Initiative

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 an unexpected Safari crash

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

CVE-2018-4214: 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 arbitrary code execution

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

CVE-2018-4204: found by OSS-Fuzz, Richard Zhu (fluorescence) working with Trend Micro's Zero Day Initiative

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

CVE-2018-4246: found by OSS-Fuzz

WebKit

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

Impact: Visiting a maliciously crafted website may leak sensitive data

Description: Credentials were unexpectedly sent when fetching CSS mask images. This was addressed by using a CORS-enabled fetch method.

CVE-2018-4190: Jun Kokatsu (@shhnjk)

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

CVE-2018-4222: Natalie Silvanovich of Google Project Zero

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