About the security content of iOS 11.4.1

This document describes the security content of iOS 11.4.1.

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 11.4.1

CFNetwork

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

Impact: Cookies may unexpectedly persist in Safari

Description: A cookie management issue was addressed with improved checks.

CVE-2018-4293: an anonymous researcher

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-2018-4327: Apple

Emoji

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

Impact: Processing an emoji under certain configurations may lead to a denial of service

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

CVE-2018-4290: Patrick Wardle of Digita Security

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 with improved input validation.

CVE-2018-4282: Adam Donenfeld (@doadam) of the Zimperium zLabs Team, Proteas of Qihoo 360 Nirvan Team, Valentin "slashd" Shilnenkov

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 memory corruption issue was addressed with improved memory handling.

CVE-2018-4280: Brandon Azad

libxpc

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

Impact: A malicious application may be able to read restricted memory

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

CVE-2018-4248: Brandon Azad

LinkPresentation

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: A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.

CVE-2018-4277: xisigr of Tencent's Xuanwu Lab (tencent.com)

Phone

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

Impact: A malicious application may be able to bypass the call confirmation prompt

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

CVE-2018-4216: Abraham Masri (@cheesecakeufo)

WebKit

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

Impact: A malicious website may exfiltrate audio data cross-origin

Description: Sound fetched through audio elements may be exfiltrated cross-origin. This issue was addressed with improved audio taint tracking.

CVE-2018-4278: Jun Kokatsu (@shhnjk)

WebKit

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 race condition was addressed with additional validation.

CVE-2018-4266: found by OSS-Fuzz

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: A spoofing issue existed in the handling of URLs. This issue was addressed with improved input validation.

CVE-2018-4274: an anonymous researcher

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 memory handling.

CVE-2018-4270: 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 type confusion issue was addressed with improved memory handling.

CVE-2018-4284: 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: Multiple memory corruption issues were addressed with improved memory handling.

CVE-2018-4261: Omair working with Trend Micro's Zero Day Initiative

CVE-2018-4262: Mateusz Krzywicki working with Trend Micro's Zero Day Initiative

CVE-2018-4263: Arayz working with Trend Micro's Zero Day Initiative

CVE-2018-4264: found by OSS-Fuzz, Yu Zhou and Jundong Xie of Ant-financial Light-Year Security Lab

CVE-2018-4265: cc working with Trend Micro's Zero Day Initiative

CVE-2018-4267: Arayz of Pangu team working with Trend Micro's Zero Day Initiative

CVE-2018-4272: 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 an unexpected Safari crash

Description: Multiple memory corruption issues were addressed with improved input validation.

CVE-2018-4271: found by OSS-Fuzz

CVE-2018-4273: found by OSS-Fuzz

WebKit Page Loading

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-2018-4260: xisigr of Tencent's Xuanwu Lab (tencent.com)

Wi-Fi

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

Impact: A malicious application may be able to break out of its sandbox

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

CVE-2018-4275: Brandon Azad

Additional recognition

Kernel

We would like to acknowledge juwei lin (@panicaII) of Trend Micro working with Trend Micro’s Zero Day Initiative for their assistance.