About the security content of iOS 11

This document describes the security content of iOS 11.

About Apple security updates

For our customers' protection, Apple doesn't disclose, discuss or confirm security issues until an investigation has taken place 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

802.1X

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

Impact: An attacker may be able to exploit weaknesses in TLS 1.0

Description: A protocol security issue was addressed by enabling TLS 1.1 and TLS 1.2.

CVE-2017-13832: Doug Wussler of Florida State University

APNs

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

Impact: An attacker in a privileged network position could track a user

Description: A privacy issue existed in the use of client certificates. This issue was addressed through a revised protocol.

CVE-2017-13863: FURIOUSMAC Team of United States Naval Academy

Bluetooth

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

Impact: An application may be able to access restricted files

Description: A privacy issue existed in the handling of Contact cards. This was addressed with improved state management.

CVE-2017-7131: Dominik Conrads of Federal Office for Information Security, an anonymous researcher, Anand Kathapurkar of India, Elvis (@elvisimprsntr)

CFNetwork

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-2017-13829: Niklas Baumstark and Samuel Gro working with Trend Micro's Zero Day Initiative

CVE-2017-13833: Niklas Baumstark and Samuel Gro working with Trend Micro's Zero Day Initiative

CFNetwork Proxies

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 cause a denial of service

Description: Multiple denial-of-service issues were addressed through improved memory handling.

CVE-2017-7083: Abhinav Bansal of Zscaler Inc.

CFString

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-2017-13821: Australian Cyber Security Centre – Australian Signals Directorate

CoreAudio

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: An out-of-bounds read was addressed by updating to Opus version 1.1.4.

CVE-2017-0381: V.E.O (@VYSEa) of Mobile Threat Research Team, Trend Micro

CoreText

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 consumption issue was addressed with improved memory handling.

CVE-2017-13825: Australian Cyber Security Centre – Australian Signals Directorate

Exchange ActiveSync

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 erase a device during Exchange account setup

Description: A validation issue existed in AutoDiscover V1. This was addressed by requiring TLS for AutoDiscover V1. AutoDiscover V2 is now supported.

CVE-2017-7088: Ilya Nesterov, Maxim Goncharov

file

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

Impact: Multiple issues in file

Description: Multiple issues were addressed by updating to version 5.31.

CVE-2017-13815: found by OSS-Fuzz

Fonts

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

Impact: Rendering untrusted text may lead to spoofing

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

CVE-2017-13828: Leonard Grey and Robert Sesek of Google Chrome

Heimdal

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 impersonate a service

Description: A validation issue existed in the handling of the KDC-REP service name. This issue was addressed through improved validation.

CVE-2017-11103: Jeffrey Altman, Viktor Duchovni and Nico Williams

HFS

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-2017-13830: Sergej Schumilo of Ruhr-University Bochum

iBooks

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

Impact: Parsing a maliciously crafted iBooks file may lead to a persistent denial of service

Description: Multiple denial-of-service issues were addressed through improved memory handling.

CVE-2017-7072: Jędrzej Krysztofiak

ImageIO

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

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

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

CVE-2017-13814: Australian Cyber Security Centre – Australian Signals Directorate

ImageIO

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

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

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

CVE-2017-13831: Glen Carmichael

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-2017-7114: Alex Plaskett of MWR InfoSecurity

Kernel

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

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 through improved input validation.

CVE-2017-13817: Maxime Villard (m00nbsd)

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-2017-13818: The UK's National Cyber Security Centre (NCSC)

CVE-2017-13836: Vlad Tsyrklevich

CVE-2017-13841: Vlad Tsyrklevich

CVE-2017-13840: Vlad Tsyrklevich

CVE-2017-13842: Vlad Tsyrklevich

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-2017-13843: an anonymous researcher, 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 execute arbitrary code with system privileges

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

CVE-2017-13854: shrek_wzw of Qihoo 360 Nirvan Team

Kernel

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

Impact: Processing a malformed mach binary may lead to arbitrary code execution

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

CVE-2017-13834: Maxime Villard (m00nbsd)

Kernel

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

Impact: A malicious application may be able to learn information about the presence and operation of other applications on the device.

Description: An application was able to access network activity information maintained by the operating system unrestricted. This issue was addressed by reducing the information available to third-party applications.

CVE-2017-13873: Xiaokuan Zhang and Yinqian Zhang of The Ohio State University, Xueqiang Wang and XiaoFeng Wang of Indiana University Bloomington, and Xiaolong Bai of Tsinghua University

Keyboard Suggestions

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

Impact: Keyboard autocorrect suggestions may reveal sensitive information

Description: The iOS keyboard was inadvertently caching sensitive information. This issue was addressed with improved heuristics.

CVE-2017-7140: Agim Allkanjari of Stream in Motion Inc.

libarchive

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

Impact: Unpacking a maliciously crafted archive may lead to arbitrary code execution

Description: A buffer overflow issue was addressed through improved memory handling.

CVE-2017-13813: found by OSS-Fuzz

CVE-2017-13816: found by OSS-Fuzz

libarchive

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

Impact: Unpacking a maliciously crafted archive may lead to arbitrary code execution

Description: Multiple memory corruption issues existed in libarchive. These issues were addressed through improved input validation.

CVE-2017-13812: found by OSS-Fuzz

libc

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

Impact: A remote attacker may be able to cause a denial-of-service

Description: A resource exhaustion issue in glob() was addressed through an improved algorithm.

CVE-2017-7086: Russ Cox of Google

libc

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

Impact: An application may be able to cause a denial of service

Description: A memory consumption issue was addressed through improved memory handling.

CVE-2017-1000373

libexpat

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

Impact: Multiple issues in expat

Description: Multiple issues were addressed by updating to version 2.2.1

CVE-2016-9063

CVE-2017-9233

libxml2

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

Impact: Processing maliciously crafted XML may lead to an unexpected application termination or arbitrary code execution

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

CVE-2017-7376: an anonymous researcher

CVE-2017-5130: an anonymous researcher

libxml2

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

Impact: Processing maliciously crafted XML may lead to an unexpected application termination or arbitrary code execution

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

CVE-2017-9050: Mateusz Jurczyk (j00ru) of Google Project Zero

libxml2

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

Impact: Processing maliciously crafted XML may lead to an unexpected application termination or arbitrary code execution

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

CVE-2017-9049: Wei Lei and Liu Yang - Nanyang Technological University in Singapore

libxml2

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

Impact: Processing maliciously crafted XML may lead to an unexpected application termination or arbitrary code execution

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

CVE-2018-4302: Gustavo Grieco

Location Framework

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

Impact: An application may be able to read sensitive location information

Description: A permissions issue existed in the handling of the location variable. This was addressed with additional ownership checks.

CVE-2017-7148: Igor Makarov from Moovit, Will McGinty and Shawnna Rodriguez of Bottle Rocket Studios

Mail Drafts

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

Impact: An attacker with a privileged network position may be able to intercept mail contents

Description: An encryption issue existed in the handling of mail drafts. This issue was addressed with improved handling of mail drafts meant to be sent encrypted.

CVE-2017-7078: Petter Flink, Pierre ALBARÈDE from Marseille (France), an anonymous researcher

Mail MessageUI

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

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

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

CVE-2017-7097: Xinshu Dong and Jun Hao Tan of Anquan Capital

Messages

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

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

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

CVE-2017-7118: Kiki Jiang and Jason Tokoph

MobileBackup

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

Impact: Backup may perform an unencrypted backup despite a requirement to perform only encrypted backups

Description: A permissions issue existed. This issue was addressed with improved permission validation.

CVE-2017-7133: Don Sparks of HackediOS.com

Notes

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

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

Description: The contents of locked notes sometimes appeared in search results. This issue was addressed through improved data cleanup.

CVE-2017-7075: Richard Will of Marathon Oil Company

Phone

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

Impact: A screenshot of secure content may be taken when locking an iOS device

Description: A timing issue existed in the handling of locking. This issue was addressed by disabling screenshots while locking.

CVE-2017-7139: an anonymous researcher

Profiles

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

Impact: Device pairing records could be inadvertently installed on a device when a profile that disallows pairing is installed

Description: Pairings were not removed when a profile disallowing pairings was installed. This was addressed by removing pairings conflicting with the configuration profile.

CVE-2017-13806: Rorie Hood of MWR InfoSecurity

Quick Look

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-2017-13822: Australian Cyber Security Centre – Australian Signals Directorate

Quick Look

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

Impact: Parsing a maliciously crafted office document may lead to an unexpected application termination or arbitrary code execution

Description: A memory consumption issue was addressed through improved memory handling.

CVE-2017-7132: Australian Cyber Security Centre – Australian Signals Directorate

Safari

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-2017-7085: xisigr of Tencent's Xuanwu Lab (tencent.com)

Sandbox Profiles

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

Impact: A malicious application may be able to learn information about the presence of other applications on the device.

Description: An application was able to determine the existence of files outside of its sandbox. This issue was addressed through additional sandbox checks.

CVE-2017-13877: Xiaokuan Zhang and Yinqian Zhang of The Ohio State University, Xueqiang Wang and XiaoFeng Wang of Indiana University Bloomington, and Xiaolong Bai of Tsinghua University

Security

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

Impact: A revoked certificate may be trusted

Description: A certificate validation issue existed in the handling of revocation data. This issue was addressed through improved validation.

CVE-2017-7080: an anonymous researcher, an anonymous researcher, Sven Driemecker of adesso mobile solutions gmbh, Rune Darrud (@theflyingcorpse) of Bærum kommune

Security

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

Impact: A malicious app may be able to track users between installs

Description: A permission checking issue existed in the handling of an app's Keychain data. This issue was addressed with improved permission checking.

CVE-2017-7146: an anonymous researcher

SQLite

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

Impact: Multiple issues in SQLite

Description: Multiple issues were addressed by updating to version 3.19.3.

CVE-2017-10989: found by OSS-Fuzz

CVE-2017-7128: found by OSS-Fuzz

CVE-2017-7129: found by OSS-Fuzz

CVE-2017-7130: found by OSS-Fuzz

SQLite

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-2017-7127: an anonymous researcher

Telephony

Available for: iPhone 5s and later, and Wi-Fi + Cellular models of iPad Air generation and later

Impact: An attacker within range may be able to execute arbitrary code

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

CVE-2017-6211: Matthew Spisak of ENDGAME (endgame.com)

Time

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

Impact: "Setting Time Zone" may incorrectly indicate that it is using location

Description: A permissions issue existed in the process that handles time zone information. The issue was resolved by modifying permissions.

CVE-2017-7145: Chris Lawrence

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 through improved input validation.

CVE-2017-7081: Apple

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-2017-7087: Apple

CVE-2017-7091: Wei Yuan of Baidu Security Lab working with Trend Micro’s Zero Day Initiative

CVE-2017-7092: Samuel Gro and Niklas Baumstark working with Trend Micro's Zero Day Initiative, Qixun Zhao (@S0rryMybad) of Qihoo 360 Vulcan Team

CVE-2017-7093: Samuel Gro and Niklas Baumstark working with Trend Micro’s Zero Day Initiative

CVE-2017-7094: Tim Michaud (@TimGMichaud) of Leviathan Security Group

CVE-2017-7095: Wang Junjie, Wei Lei and Liu Yang of Nanyang Technological University working with Trend Micro’s Zero Day Initiative

CVE-2017-7096: Wei Yuan of Baidu Security Lab

CVE-2017-7098: Felipe Freitas of Instituto Tecnológico de Aeronáutica

CVE-2017-7099: Apple

CVE-2017-7100: Masato Kinugawa and Mario Heiderich of Cure53

CVE-2017-7102: Wang Junjie, Wei Lei, and Liu Yang of Nanyang Technological University

CVE-2017-7104: likemeng of Baidu Secutity Lab

CVE-2017-7107: Wang Junjie, Wei Lei and Liu Yang of Nanyang Technological University

CVE-2017-7111: likemeng of Baidu Security Lab (xlab.baidu.com) working with Trend Micro's Zero Day Initiative

CVE-2017-7117: lokihardt of Google Project Zero

CVE-2017-7120: chenqin (陈钦) of Ant-financial Light-Year Security Lab

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 universal cross site scripting

Description: A logic issue existed in the handling of the parent-tab. This issue was addressed with improved state management.

CVE-2017-7089: Anton Lopanitsyn of ONSEC, Frans Rosén of Detectify

WebKit

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

Impact: Cookies belonging to one origin may be sent to another origin

Description: A permissions issue existed in the handling of web browser cookies. This issue was addressed by no longer returning cookies for custom URL schemes.

CVE-2017-7090: Apple

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-2017-7106: Oliver Paukstadt of Thinking Objects GmbH (to.com)

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 cross-site scripting attack

Description: Application Cache policy may be unexpectedly applied.

CVE-2017-7109: avlidienbrunn

WebKit

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

Impact: A malicious website may be able to track users in Safari private browsing mode

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

CVE-2017-7144: Mohammad Ghasemisharif of UIC’s BITS Lab

WebKit Storage

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

Impact: Website data may persist after a Safari Private browsing session

Description: An information leakage issue existed in the handling of website data in Safari Private windows. This issue was addressed with improved data handling.

CVE-2017-7142: Rich Shawn O’Connell, an anonymous researcher, an anonymous researcher

Wi-Fi

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

Impact: An attacker within range may be able to execute arbitrary code on the Wi-Fi chip

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

CVE-2017-11120: Gal Beniamini of Google Project Zero

CVE-2017-11121: Gal Beniamini of Google Project Zero

Wi-Fi

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

Impact: Malicious code executing on the Wi-Fi chip may be able to execute arbitrary code with kernel privileges on the application processor

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

CVE-2017-7103: Gal Beniamini of Google Project Zero

CVE-2017-7105: Gal Beniamini of Google Project Zero

CVE-2017-7108: Gal Beniamini of Google Project Zero

CVE-2017-7110: Gal Beniamini of Google Project Zero

CVE-2017-7112: Gal Beniamini of Google Project Zero

Wi-Fi

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

Impact: Malicious code executing on the Wi-Fi chip may be able to execute arbitrary code with kernel privileges on the application processor

Description: Multiple race conditions were addressed through improved validation.

CVE-2017-7115: Gal Beniamini of Google Project Zero

Wi-Fi

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

Impact: Malicious code executing on the Wi-Fi chip may be able to read restricted kernel memory

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

CVE-2017-7116: Gal Beniamini of Google Project Zero

Wi-Fi

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

Impact: A attacker within range may be able to read restricted memory from the Wi-Fi chipset

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

CVE-2017-11122: Gal Beniamini of Google Project Zero

zlib

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

Impact: Multiple issues in zlib

Description: Multiple issues were addressed by updating to version 1.2.11.

CVE-2016-9840

CVE-2016-9841

CVE-2016-9842

CVE-2016-9843

Additional recognition

LaunchServices

We would like to acknowledge Mark Zimmermann of EnBW Energie Baden-Württemberg AG for their assistance.

Security

We would like to acknowledge Abhinav Bansal of Zscaler, Inc. for their assistance.

Webkit

We would like to acknowledge xisigr of Tencent's Xuanwu Lab (tencent.com) for their assistance.

WebKit

We would like to acknowledge Rayyan Bijoora (@Bijoora) of The City School, PAF Chapter for their assistance.

WebKit Web Inspector

We would like to acknowledge Ioan Bizău of Bloggify for their assistance.