About the security content of iOS 11.1

This document describes the security content of iOS 11.1.

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 11.1

CoreText

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 an unexpected application termination

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

CVE-2017-13849: Ro of SavSec

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-2017-13799: Lufeng Li of Qihoo 360 Vulcan Team

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 process information maintained by the operating system unrestricted. This issue was addressed through rate limiting.

CVE-2017-13852: 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

Messages

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 access photos from the lock screen

Description: A lock screen issue allowed access to photos via Reply With Message on a locked device. This issue was addressed with improved state management.

CVE-2017-13844: Miguel Alvarado of iDeviceHelp INC

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-2017-13805: Yiğit Can YILMAZ (@yilmazcanyigit), Ayden Panhuyzen (madebyayden.co)

StreamingZip

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

Impact: A malicious zip file may be able modify restricted areas of the file system

Description: A path handling issue was addressed with improved validation.

CVE-2017-13804: @qwertyoruiopz at KJC Research Intl. S.R.L.

UIKit

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

Impact: Characters in a secure text field might be revealed

Description: The characters in a secure text field were revealed during focus change events. This issue was addressed through improved state management.

CVE-2017-7113: an anonymous researcher, Duraiamuthan Harikrishnan of Tech Mahindra, Ricardo Sampayo of Bemo Ltd

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-2017-13783: Ivan Fratric of Google Project Zero

CVE-2017-13784: Ivan Fratric of Google Project Zero

CVE-2017-13785: Ivan Fratric of Google Project Zero

CVE-2017-13791: Ivan Fratric of Google Project Zero

CVE-2017-13792: Ivan Fratric of Google Project Zero

CVE-2017-13793: Hanul Choi working with Trend Micro's Zero Day Initiative

CVE-2017-13794: Ivan Fratric of Google Project Zero

CVE-2017-13795: Ivan Fratric of Google Project Zero

CVE-2017-13796: Ivan Fratric of Google Project Zero

CVE-2017-13797: Ivan Fratric of Google Project Zero

CVE-2017-13798: Ivan Fratric of Google Project Zero

CVE-2017-13788: xisigr of Tencent's Xuanwu Lab (tencent.com)

CVE-2017-13802: Ivan Fratric of Google Project Zero

CVE-2017-13803: chenqin (陈钦) of Ant-financial Light-Year Security

Wi-Fi

Available for: iPhone 8, iPhone 8 Plus, and iPhone X

Not impacted: iPhone 7, iPhone 7 Plus, iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus, iPhone SE, iPhone 5s, iPad Air and later, and iPod Touch 6th generation

Impact: An attacker in Wi-Fi range may force nonce reuse in WPA unicast/PTK clients (Key Reinstallation Attacks - KRACK)

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

CVE-2017-13077: Mathy Vanhoef of the imec-DistriNet group at KU Leuven

CVE-2017-13078: Mathy Vanhoef of the imec-DistriNet group at KU Leuven

Wi-Fi

Available for: iPhone 7 and later, and iPad Pro 9.7-inch (early 2016) and later

Impact: An attacker in Wi-Fi range may force nonce reuse in WPA multicast/GTK clients (Key Reinstallation Attacks - KRACK)

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

CVE-2017-13080: Mathy Vanhoef of the imec-DistriNet group at KU Leuven