CVE-2022-22628: Apple Safari Use-After-Free Vulnerability

CVE-2022-22628 Overview

CVE-2022-22628 is a use after free vulnerability affecting Apple's WebKit browser engine, which powers Safari and other applications across Apple's ecosystem. The vulnerability exists due to improper memory management when processing web content. An attacker can exploit this flaw by crafting malicious web content that, when processed by affected applications, leads to arbitrary code execution on the target system.

This vulnerability is particularly concerning because it can be triggered remotely through normal web browsing activities. A user simply needs to visit a malicious website or encounter crafted web content embedded in otherwise legitimate pages for the exploitation to occur.

Critical Impact

Processing maliciously crafted web content may lead to arbitrary code execution, potentially allowing attackers to gain complete control over affected Apple devices.

Affected Products

• Apple Safari (versions prior to 15.4)
• Apple macOS Monterey (versions prior to 12.3)
• Apple iOS and iPadOS (versions prior to 15.4)
• Apple tvOS (versions prior to 15.4)
• Apple watchOS (versions prior to 8.5)

Discovery Timeline

• September 23, 2022 - CVE-2022-22628 published to NVD
• May 22, 2025 - Last updated in NVD database

Technical Details for CVE-2022-22628

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a memory corruption flaw that occurs when a program continues to use a memory reference after it has been freed. In the context of WebKit, this vulnerability manifests during the processing of web content, where certain operations can cause the browser engine to reference memory that has already been deallocated.

Use after free vulnerabilities in browser engines are particularly dangerous because browsers routinely process untrusted content from the internet. The JavaScript engine and DOM manipulation capabilities provide attackers with precise control over memory allocation patterns, making exploitation more reliable.

The attack requires user interaction—specifically, the victim must visit a malicious webpage or process crafted web content. However, this interaction requirement is easily met through phishing, malvertising, or compromising legitimate websites.

Root Cause

The root cause of CVE-2022-22628 lies in WebKit's memory management implementation. When processing certain sequences of web content operations, the browser engine fails to properly track memory lifecycle states. This results in scenarios where freed memory objects are subsequently accessed, potentially allowing attacker-controlled data to be interpreted as legitimate program structures.

Apple addressed this vulnerability by implementing improved memory management, specifically ensuring that object references are properly invalidated upon deallocation and that the runtime checks prevent access to freed memory regions.

Attack Vector

The attack vector for CVE-2022-22628 is network-based, requiring no special privileges on the target system. The exploitation scenario typically follows this pattern:

1. The attacker crafts malicious web content designed to trigger the use after free condition in WebKit
2. The victim accesses the malicious content through Safari or any WebKit-based application
3. The crafted content manipulates memory allocation and deallocation sequences to control the freed memory region
4. Subsequent access to the freed memory allows the attacker to redirect execution flow
5. Successful exploitation results in arbitrary code execution with the privileges of the browser process

The vulnerability affects multiple Apple platforms because WebKit serves as the shared web rendering engine across Safari, iOS, iPadOS, macOS, tvOS, and watchOS applications.

Detection Methods for CVE-2022-22628

Indicators of Compromise

• Unexpected crashes or abnormal behavior in Safari or WebKit-based applications
• Browser processes spawning unexpected child processes or making unusual system calls
• Memory access violations or segmentation faults in WebKit-related processes logged in system crash reports
• Unusual network traffic patterns following web browsing sessions

Detection Strategies

• Monitor system logs for WebKit crash reports that indicate memory corruption or access violations
• Implement endpoint detection to identify unusual process behavior following browser activity
• Deploy web filtering solutions to block known malicious domains serving exploit content
• Use behavioral analysis to detect post-exploitation activities such as payload downloads or lateral movement

Monitoring Recommendations

• Enable enhanced crash reporting on Apple devices to capture detailed information about WebKit failures
• Configure network security appliances to inspect web traffic for suspicious JavaScript patterns
• Implement application control policies to limit the scope of potential post-exploitation activities
• Review security logs regularly for signs of browser-based exploitation attempts

How to Mitigate CVE-2022-22628

Immediate Actions Required

• Update all affected Apple devices to the patched software versions immediately
• Prioritize updates for devices that regularly browse untrusted web content
• Consider using alternative browsers temporarily if immediate patching is not possible
• Enable automatic software updates on all Apple devices to ensure timely patch deployment

Patch Information

Apple has released security updates addressing this vulnerability across all affected platforms. Users should upgrade to the following versions or later:

• Safari 15.4 - See Apple Support Article HT213187
• macOS Monterey 12.3 - See Apple Support Article HT213183
• iOS 15.4 and iPadOS 15.4 - See Apple Support Article HT213182
• tvOS 15.4 - See Apple Support Article HT213186
• watchOS 8.5 - See Apple Support Article HT213193

Workarounds

• Restrict browsing to trusted websites only until patches can be applied
• Disable JavaScript execution in Safari settings (note: this will break functionality on many websites)
• Implement network-level content filtering to block potentially malicious web content
• Use mobile device management (MDM) to enforce browser security policies on enterprise devices

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

# Check macOS version
sw_vers -productVersion

# Check for available updates
softwareupdate -l