About the security content of iOS 11.2

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.

Released December 2, 2017

App Store

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 App Store

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

CVE-2017-7164: Jerry Decime

Entry added January 11, 2018

Auto Unlock

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-2017-13905: Samuel Groß (@5aelo)

Entry added October 18, 2018

Calculator

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 alter currency conversion rates

Description: Exchange rates were retrieved from HTTP rather than HTTPS. This was addressed by enabling HTTPS for exchange rates.

CVE-2017-2411: Richard Shupak (linkedin.com/in/rshupak), Seth Vargo (@sethvargo) of Google, and an anonymous researcher

Entry added May 2, 2018, updated June 14, 2018

CFNetwork Session

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-2017-7172: Richard Zhu (fluorescence) working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

CoreAnimation

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 elevated privileges

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

CVE-2017-7171: 360 Security working with Trend Micro's Zero Day Initiative, and Tencent Keen Security Lab (@keen_lab) working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

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-2017-7151: Samuel Groß (@5aelo)

Entry added October 18, 2018

IOKit

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: Multiple memory corruption issues were addressed through improved state management.

CVE-2017-13847: Ian Beer of Google Project Zero

Entry updated January 10, 2018

IOKit

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-2017-7162: Tencent Keen Security Lab (@keen_lab) working with Trend Micro's Zero Day Initiative

Entry added December 21, 2017, updated January 10, 2018

IOMobileFrameBuffer

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-2017-13879: Apple

Entry updated October 24, 2018

IOSurface

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-2017-13861: 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-2017-13904: Kevin Backhouse of Semmle Ltd.

Entry added February 14, 2018

Kernel

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

Impact: An application may be able to read kernel memory (Meltdown)

Description: Systems with microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized disclosure of information to an attacker with local user access via a side-channel analysis of the data cache.

CVE-2017-5754: Jann Horn of Google Project Zero; Moritz Lipp of Graz University of Technology; Michael Schwarz of Graz University of Technology; Daniel Gruss of Graz University of Technology; Thomas Prescher of Cyberus Technology GmbH; Werner Haas of Cyberus Technology GmbH; Stefan Mangard of Graz University of Technology; Paul Kocher; Daniel Genkin of University of Pennsylvania and University of Maryland; Yuval Yarom of University of Adelaide and Data61; and Mike Hamburg of Rambus (Cryptography Research Division)

Entry added January 4, 2018, updated January 10, 2018

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-2017-13862: Apple

CVE-2017-13867: Ian Beer of Google Project Zero

CVE-2017-13876: Ian Beer of Google Project Zero

Entry updated December 21, 2017

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

CVE-2017-7173: Brandon Azad

Entry updated August 1, 2018

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 type confusion issue was addressed with improved memory handling.

CVE-2017-13855: Jann Horn 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 read restricted memory

Description: Multiple validation issues were addressed with improved input sanitization.

CVE-2017-13865: Ian Beer of Google Project Zero

CVE-2017-13868: Brandon Azad

CVE-2017-13869: Jann Horn of Google Project Zero

Kernel

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

Impact: A local user may be able to cause unexpected system termination or read kernel memory

Description: An input validation issue existed in the kernel. This issue was addressed through improved input validation.

CVE-2017-7154: Jann Horn of Google Project Zero

Entry added December 21, 2017

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 privilege

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

CVE-2017-13880: Apple

Entry added October 18, 2018

Mail

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

Impact: Incorrect certificate is used for encryption

Description: A S/MIME issue existed in the handling of encrypted email. This issue was addressed through improved selection of the encryption certificate.

CVE-2017-13874: Nicolas Devillard

Entry updated April 9, 2018

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

Description: An encryption issue existed with S/MIME credentials. The issue was addressed with additional checks and user control.

CVE-2017-13860: Michael Weishaar of INNEO Solutions GmbH

Mail Message Framework

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-2017-7152: Oliver Paukstadt of Thinking Objects GmbH (to.com)

Entry added December 21, 2017

ReplayKit

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

Impact: A user may not have control over their screen broadcast

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

CVE-2017-13888: Dan Niemeyer of Microsoft, Peter Pau (ArcanaArt.com)

Entry added June 21, 2018, updated September 8, 2020

SafariViewController

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 through improved state management.

CVE-2017-13891: Janne Raiskila (@raiskila)

Entry added June 21, 2018

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-2017-13885: 360 Security working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

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 through improved memory handling.

CVE-2017-7165: 360 Security working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

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-2017-13884: 360 Security working with Trend Micro's Zero Day Initiative

Entry added January 22, 2018

WebKit

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: Redirect responses to 401 Unauthorized may allow a malicious website to incorrectly display the lock icon on mixed content. This issue was addressed through improved URL display logic.

CVE-2017-7153: Jerry Decime

Entry added January 11, 2018

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-2017-7156: Yuan Deng of Ant-financial Light-Year Security Lab

CVE-2017-7157: an anonymous researcher

CVE-2017-13856: Jeonghoon Shin

CVE-2017-13870: Tencent Keen Security Lab (@keen_lab) working with Trend Micro's Zero Day Initiative

CVE-2017-7160: Richard Zhu (fluorescence) working with Trend Micro's Zero Day Initiative

CVE-2017-13866: Tencent Keen Security Lab (@keen_lab) working with Trend Micro's Zero Day Initiative

Entry added December 13, 2017, updated May 4, 2018

Wi-Fi

Available for: iPhone 6s, iPhone 6s Plus, iPhone 6, iPhone 6 Plus, iPhone SE, iPhone 5s, 12.9-inch iPad Pro 1st generation, iPad Air 2, iPad Air, iPad 5th generation, iPad mini 4, iPad mini 3, iPad mini 2, and iPod touch 6th generation
Released for iPhone 7 and later and iPad Pro 9.7-inch (early 2016) and later in iOS 11.1.

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

WebKit

We would like to acknowledge Yiğit Can YILMAZ (@yilmazcanyigit) and Abhinash Jain (@abhinashjain) researcher for their assistance.

Entry added February 14, 2018, updated April 9, 2018