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
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
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
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
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: Apple TV 4K and Apple TV (4th 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
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
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: natashenka 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
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, Amy 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: natashenka of Google Project Zero
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