Apple WebKit Use-After-Free Remote Code Execution Vulnerability (CVE-2023-28205) Security Advisory
Executive & SecOps Summary
SECOPS ASSESSMENTSystems running Safari prior to 16.4.1, iOS/iPadOS prior to 15.7.5 and 16.4.1, and macOS Ventura prior to 13.3.1
Processing maliciously crafted web content may lead to arbitrary code execution due to a Use-After-Free memory corruption issue, which has been actively exploited in the wild
Immediately apply the official security updates and OS patches provided by Apple
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Apple has addressed this issue with improved memory management in the latest software releases.
For macOS administrators, enforce the software update immediately via the command-line interface:
# List available software updates
softwareupdate -l
# Download and install macOS Ventura 13.3.1 or later and restart the system
sudo softwareupdate -i -a --restart2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, enable 'Lockdown Mode' on macOS and iOS devices to significantly reduce the attack surface by disabling complex WebKit features.
For enterprise deployments, use MDM profiles to restrict access to untrusted websites or enforce security configurations:
<!-- Example MDM payload snippet to restrict untrusted web features -->
<dict>
<key>PayloadType</key>
<string>com.apple.webcontent-filter</string>
<key>FilterType</key>
<string>BuiltIn</string>
<key>PayloadEnabled</key>
<true/>
</dict>3. Log Audit & IoC Verification Commands
Run the following shell script on macOS endpoints to audit the current OS and Safari versions to identify vulnerable assets:
#!/bin/bash
# Audit script for macOS and Safari vulnerability assessment
echo '[*] Auditing System Version...'
OS_VER=$(sw_vers -productVersion)
echo "Current macOS Version: $OS_VER"
echo '[*] Auditing Safari Version...'
if [ -f '/Applications/Safari.app/Contents/Info.plist' ]; then
SAFARI_VER=$(defaults read /Applications/Safari.app/Contents/Info.plist CFBundleShortVersionString)
echo "Current Safari Version: $SAFARI_VER"
else
echo '[-] Safari is not installed in the default path.'
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2023-28205) is a critical Use-After-Free (UAF) memory corruption flaw residing within Apple's WebKit rendering engine. The root cause lies in improper memory management when handling dynamic objects or DOM elements within web content. When an object in memory is deallocated but the reference pointer is not cleared, the engine attempts to access or write to this freed memory address, leading to unstable states and potential control flow hijacking.
2. Exploitation Mechanics & Attack Scenario
An attacker exploits this vulnerability by hosting a specially crafted web page containing malicious HTML, CSS, or JavaScript. When a target user visits the malicious site via Safari or any application utilizing the WebKit framework, the engine processes the crafted content. This triggers the Use-After-Free condition, allowing the attacker to overwrite the freed memory space with controlled payloads and execute arbitrary shellcode within the context of the WebKit process.
3. Infrastructure & Business Impact
As this vulnerability has been actively exploited in the wild as a zero-day, it poses an immediate threat to enterprise environments. Successful exploitation allows remote attackers to execute arbitrary code on corporate endpoints (MacBooks, iPhones, iPads). This can lead to complete device compromise, unauthorized access to sensitive corporate networks, credential theft, and the deployment of advanced spyware.
Official Vendor Advisories & References
A use after free issue was addressed with improved memory management. This issue is fixed in Safari 16.4.1, iOS 15.7.5 and iPadOS 15.7.5, iOS 16.4.1 and iPadOS 16.4.1, macOS Ventura 13.3.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
Frequently Asked SecOps Questions (CVE-2023-28205)
FAQQ1. How critical is CVE-2023-28205 and is it actively exploited in the wild?
CVE-2023-28205 is rated CVSS 8.8 (HIGH) with a 30-day EPSS exploitation probability of 27.1%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2023-28205?
Primary impacted vendors include apple across safari, iphone_os, ipados, macos. Scope summary: Safari versions prior to 16.4.1, iOS and iPadOS versions prior to 15.7.5 and 16.4.1, and macOS Ventura versions prior to 13.3.1
Q3. What temporary mitigations or workarounds exist for CVE-2023-28205 before patching?
[Mitigation] Immediately apply the official security updates and OS patches provided by Apple Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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