CVE-2023-43010: Apple WebKit Use-After-Free Vulnerability

CVE-2023-43010 Overview

CVE-2023-43010 is a memory corruption vulnerability affecting multiple Apple products including iOS, iPadOS, macOS Sonoma, and Safari. The vulnerability stems from improper memory handling when processing maliciously crafted web content. An attacker could exploit this flaw by enticing a user to visit a specially crafted website, potentially leading to memory corruption and arbitrary code execution on the victim's device.

Critical Impact

Processing maliciously crafted web content may lead to memory corruption, potentially allowing attackers to execute arbitrary code or cause application crashes on affected Apple devices.

Affected Products

• iOS 17.2 and iPadOS 17.2 (versions prior to these are vulnerable)
• macOS Sonoma 14.2 (versions prior to this are vulnerable)
• Safari 17.2 (versions prior to this are vulnerable)
• iOS 16.7.15 and iPadOS 16.7.15 (versions prior to these are vulnerable)
• iOS 15.8.7 and iPadOS 15.8.7 (versions prior to these are vulnerable)

Discovery Timeline

• 2026-03-12 - CVE-2023-43010 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2023-43010

Vulnerability Analysis

This memory corruption vulnerability exists within Apple's web content processing components, likely within the WebKit rendering engine that powers Safari and embedded web views across Apple's ecosystem. The vulnerability is triggered when the affected software processes specially crafted web content, resulting in improper memory handling operations.

The attack requires user interaction, specifically that a victim must visit a malicious website or view attacker-controlled web content. However, once triggered, the vulnerability can lead to memory corruption that could be leveraged for code execution. The impact is significant as it affects confidentiality, integrity, and availability of the affected systems.

Root Cause

The root cause of CVE-2023-43010 is improper memory handling within the web content processing pipeline. When parsing or rendering certain malformed web content structures, the affected components fail to properly manage memory allocations and boundaries. This can result in memory corruption conditions such as buffer overflows, use-after-free scenarios, or out-of-bounds memory access.

Apple addressed this vulnerability by implementing improved memory handling routines that properly validate and manage memory operations during web content processing.

Attack Vector

The attack vector for CVE-2023-43010 is network-based and requires user interaction. An attacker would need to craft malicious web content and deliver it to a potential victim through various means:

The exploitation scenario involves hosting malicious web content on an attacker-controlled server or compromising a legitimate website to serve the exploit payload. When a user navigates to the malicious page using a vulnerable version of Safari or an application that uses WebKit for rendering web content, the malformed content triggers the memory corruption condition.

The attacker could leverage social engineering techniques such as phishing emails, malicious advertisements, or compromised legitimate websites to deliver the exploit to victims.

Detection Methods for CVE-2023-43010

Indicators of Compromise

• Unexpected Safari or WebKit-based application crashes when visiting certain websites
• Unusual memory consumption patterns in Safari or web view processes
• Suspicious network connections originating from Safari or WebKit processes following web content rendering
• Core dump files indicating memory corruption in WebKit-related processes

Detection Strategies

• Monitor for abnormal Safari or WebKit process behavior including unexpected child process creation
• Implement endpoint detection rules to identify memory corruption exploitation attempts in browser processes
• Analyze web traffic for suspicious JavaScript or HTML structures that may indicate exploitation attempts
• Deploy sandboxing and process isolation monitoring to detect escape attempts

Monitoring Recommendations

• Enable detailed logging for Safari and WebKit processes to capture crash data
• Implement network monitoring to detect connections to known malicious infrastructure
• Monitor system integrity and file changes following web browsing sessions
• Use SentinelOne Singularity Platform for real-time behavioral analysis and threat detection on Apple endpoints

How to Mitigate CVE-2023-43010

Immediate Actions Required

• Update all affected Apple devices to the latest available operating system versions immediately
• Ensure Safari is updated to version 17.2 or later on all macOS systems
• Implement web content filtering to block access to known malicious domains
• Educate users about the risks of clicking links from untrusted sources

Patch Information

Apple has addressed CVE-2023-43010 with improved memory handling in the following software updates:

For detailed patch information, refer to the official Apple security advisories:

• Apple Support Document #120300
• Apple Support Document #120877
• Apple Support Document #120879
• Apple Support Document #126632
• Apple Support Document #126646

Workarounds

• Use alternative browsers that do not rely on WebKit for rendering until patches can be applied
• Implement network-level web filtering to block potentially malicious web content
• Restrict web browsing on critical systems to trusted sites only
• Consider using Safari's Reader mode when viewing untrusted content to reduce attack surface
• Enable automatic updates on all Apple devices to receive security patches promptly