Apple iOS, iPadOS, macOS, and Safari Remote Code Execution Vulnerability via Memory Corruption (CVE-2023-32435)
Executive & SecOps Summary
SECOPS ASSESSMENTiOS versions prior to 15.7.7 and 16.4, iPadOS prior to 15.7.7 and 16.4, macOS Ventura prior to 13.3, and Safari prior to 16.4
Processing maliciously crafted web content may lead to arbitrary code execution and complete system compromise
Immediately apply official Apple software updates to secure versions (iOS 15.7.7/16.4, macOS Ventura 13.3, etc.)
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Update all Apple devices to the latest available operating system versions. For enterprise macOS fleets, administrators can force software updates using the command line:
# Check for available updates and install all critical security patches on macOS
sudo softwareupdate -l
sudo softwareupdate -i -a2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict access to untrusted websites and enable 'Lockdown Mode' on iOS/macOS devices to significantly reduce the WebKit attack surface.
# Enable application firewall on macOS to block unauthorized incoming connections
sudo defaults write /Library/Preferences/com.apple.alf globalstate -int 1
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.alf.agent.plist
sudo launchctl load /System/Library/LaunchDaemons/com.apple.alf.agent.plist3. Log Audit & IoC Verification Commands
Use the following script to audit the current macOS and Safari versions to identify vulnerable assets within your environment.
# Script to verify current macOS and Safari application versions
echo '=== OS Version ==='
sw_vers
echo '=== Safari Version ==='
/usr/libexec/PlistBuddy -c 'Print CFBundleShortVersionString' /Applications/Safari.app/Contents/Info.plistBlock Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2023-32435) is a critical memory corruption issue within Apple's WebKit rendering engine and associated system components. The root cause lies in improper state management and insufficient input validation, leading to an Out-of-bounds Write (CWE-787) condition where memory can be overwritten outside of intended boundaries.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by hosting or distributing specially crafted web content (such as malicious HTML/JavaScript). When a target user visits the malicious website or opens a link via Safari or any WebKit-based application, the rendering engine processes the corrupted state, triggering an out-of-bounds write. This allows the attacker to hijack the application's control flow and execute arbitrary machine code within the context of the sandbox or system.
3. Infrastructure & Business Impact
This vulnerability is actively exploited in the wild, specifically targeting iOS versions released before iOS 15.7, and is cataloged in the CISA KEV list. Successful exploitation allows remote attackers to gain unauthorized access to corporate endpoints, compromise sensitive user data, steal credentials, and potentially establish a foothold for lateral movement within enterprise networks.
Official Vendor Advisories & References
A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Ventura 13.3, Safari 16.4, iOS 16.4 and iPadOS 16.4, iOS 15.7.7 and iPadOS 15.7.7. Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited against versions of iOS released before iOS 15.7.
Frequently Asked SecOps Questions (CVE-2023-32435)
FAQQ1. How critical is CVE-2023-32435 and is it actively exploited in the wild?
CVE-2023-32435 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 22.9%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2023-32435?
Primary impacted vendors include apple across ios, ipados, macos, safari. Scope summary: iOS and iPadOS prior to 15.7.7 / 16.4, macOS Ventura prior to 13.3, and Safari prior to 16.4
Q3. What temporary mitigations or workarounds exist for CVE-2023-32435 before patching?
[Mitigation] Immediately apply official Apple software updates to secure versions (iOS 15.7.7/16.4, macOS Ventura 13.3, etc.) Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
Generate an Internal Engineering Notice or CISO Report for CVE-2023-32435
Instantly format this advisory into an executive CISO summary or engineering patch ticket.
🔗 Related Advisories in Similar Stack (apple)
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