CVE-2022-22620: Apple Safari Use-After-Free Vulnerability

CVE-2022-22620 Overview

CVE-2022-22620 is a critical Use After Free vulnerability affecting the WebKit rendering engine used by Apple Safari, iOS, iPadOS, and macOS. This memory corruption flaw allows remote attackers to execute arbitrary code when a user visits a maliciously crafted web page. The vulnerability has been actively exploited in the wild, prompting Apple to release emergency security updates across its entire ecosystem.

Critical Impact

Processing maliciously crafted web content may lead to arbitrary code execution. Apple has confirmed active exploitation of this vulnerability in the wild.

Affected Products

• Apple Safari versions prior to 15.3 (v. 16612.4.9.1.8 and 15612.4.9.1.8)
• Apple iOS versions prior to 15.3.1
• Apple iPadOS versions prior to 15.3.1
• Apple macOS Monterey versions prior to 12.2.1

Discovery Timeline

• 2022-03-18 - CVE-2022-22620 published to NVD
• 2025-10-23 - Last updated in NVD database

Technical Details for CVE-2022-22620

Vulnerability Analysis

CVE-2022-22620 is classified as CWE-416 (Use After Free), a critical memory corruption vulnerability affecting the WebKit browser engine. Use After Free vulnerabilities occur when a program continues to use a memory location after it has been freed, potentially allowing attackers to corrupt data structures, execute arbitrary code, or crash the application.

In this case, the vulnerability resides in how WebKit handles certain web content. When processing maliciously crafted HTML or JavaScript, WebKit's memory management routines can be tricked into accessing freed memory regions. An attacker who successfully exploits this vulnerability could gain code execution within the context of the browser process, potentially leading to complete system compromise.

The network-based attack vector requires user interaction—specifically, the victim must navigate to a malicious webpage or open a compromised document that triggers the WebKit rendering engine. Once triggered, the attacker can achieve arbitrary code execution with the privileges of the current user.

Root Cause

The root cause of CVE-2022-22620 lies in improper memory management within WebKit's rendering engine. A Use After Free condition occurs when the code continues to reference a memory object after it has been deallocated. This can happen due to:

• Asynchronous operations that free an object while another reference to it remains active
• Improper object lifecycle management during DOM manipulation
• Race conditions in the rendering pipeline that lead to premature object destruction

Apple addressed this issue by implementing improved memory management controls within WebKit, ensuring that memory references are properly tracked and invalidated when objects are freed.

Attack Vector

The attack vector for CVE-2022-22620 is network-based and requires user interaction. An attacker can exploit this vulnerability through several delivery mechanisms:

1. Malicious Website - Hosting a webpage containing specially crafted HTML/JavaScript that triggers the Use After Free condition when rendered by WebKit
2. Phishing Campaigns - Sending victims links to attacker-controlled websites via email, SMS, or social media
3. Watering Hole Attacks - Compromising legitimate websites frequented by targeted victims to serve malicious content
4. Malicious Advertisements - Injecting exploit code into advertising networks to reach victims on legitimate websites

The exploitation requires no authentication, though it does require the victim to actively navigate to or interact with the malicious content.

Detection Methods for CVE-2022-22620

Indicators of Compromise

• Unexpected Safari, iOS, or macOS crashes during web browsing sessions
• Unusual process spawning from WebKit or Safari parent processes
• Anomalous network connections originating from browser processes to unknown external hosts
• Suspicious JavaScript execution patterns in web content logs

Detection Strategies

• Monitor endpoint telemetry for WebKit-related crashes with memory access violations
• Deploy network monitoring to detect connections to known malicious infrastructure associated with WebKit exploits
• Implement behavioral analysis to detect unusual child process creation from Safari or WebKit processes
• Review system logs for signs of privilege escalation following browser activity

Monitoring Recommendations

• Enable crash reporting and log collection for Safari and WebKit processes across all Apple devices
• Deploy SentinelOne agents on macOS endpoints to detect and prevent exploitation attempts in real-time
• Implement web content filtering to block access to known malicious domains and suspicious web content
• Monitor for CISA KEV alerts and threat intelligence feeds related to active WebKit exploitation campaigns

How to Mitigate CVE-2022-22620

Immediate Actions Required

• Update all Apple devices to the patched versions: macOS Monterey 12.2.1, iOS 15.3.1, iPadOS 15.3.1, and Safari 15.3
• Prioritize patching for systems with internet-facing browser access and high-value users
• Review CISA's Known Exploited Vulnerabilities Catalog for additional guidance
• Enable automatic updates on all Apple devices to receive future security patches promptly

Patch Information

Apple has released security updates to address CVE-2022-22620 with improved memory management. Apply the following patches immediately:

• macOS Monterey 12.2.1 - Apple Security Update HT213092
• iOS 15.3.1 and iPadOS 15.3.1 - Apple Security Update HT213093
• Safari 15.3 - Apple Security Update HT213091

Linux distributions using WebKitGTK should reference the Gentoo GLSA 202208-39 advisory for applicable patches.

Workarounds

• Disable JavaScript in Safari settings if immediate patching is not possible (note: this will significantly impact web functionality)
• Use alternative browsers temporarily until patches can be applied
• Implement network-level filtering to block known malicious domains and web content
• Restrict web browsing on unpatched systems to trusted internal sites only

# Verify macOS version for patch status
sw_vers -productVersion

# Check Safari version
/Applications/Safari.app/Contents/MacOS/Safari --version

# Enable automatic updates on macOS
sudo softwareupdate --schedule on