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Apple Ships iOS 17.3, Warns of WebKit Zero-Day Exploitation

Apple pushes out fresh versions of its iOS and macOS platforms to fix WebKit vulnerabilities being exploited as zero-day in the wild.

Apple patches exploited iOS zero-day

Apple is pushing out fresh versions of its flagship iOS and macOS platforms with patches for multiple WebKit vulnerabilities being exploited as zero-day in the wild.

The device maker said the newest iOS 17.3 and macOS Sonoma 14.3 updates fix at least 16 documented vulnerabilities that expose Apple users to code execution, denial-of-service and data exposure attacks.

The Cupertino company called urgent attention to a trio of WebKit security defects that have already been exploited in zero-day attacks.

As is customary, Apple did not release technical details or indicators of compromise to help defenders hunt for signs of compromise.  According to a barebones iOS 17.3 advisory, one of the WebKit flaws —  CVE-2024-23222 — may have been exploited against newer versions of the operating system. 

“Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited,” the company said. “A type confusion issue was addressed with improved checks.”

A separate advisory documents a pair of WebKit bugs — CVE-2023-42916 and CVE-2023-42917 — that Apple says may have been exploited against versions of iOS before iOS 16.7.1.

The iOS and MacOS updates also fix security problems in the Apple Neural Engine, CoreCrypto, Mail Search, Reset Services, Shortcuts and Time Zone.

Related: Volexity Catches Chinese Hackers Exploiting Ivanti VPN Zero-Days

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Related: Microsoft: Russian Gov Hackers Stole Email Data From Senior Execs

Related: CISA Issues Emergency Directive on Ivanti Zero-Days

Related: Chinese Spies Exploited VMware Server Vulnerability Since 2021

Written By

Ryan Naraine is Editor-at-Large at SecurityWeek and host of the popular Security Conversations podcast series. He is a security community engagement expert who has built programs at major global brands, including Intel Corp., Bishop Fox and GReAT. Ryan is a founding-director of the Security Tinkerers non-profit, an advisor to early-stage entrepreneurs, and a regular speaker at security conferences around the world.

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