CVE-2023-32366
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code by tricking users into processing malicious font files. It affects Apple macOS, iOS, and iPadOS users who haven't updated to the patched versions.
💻 Affected Systems
- macOS
- iOS
- iPadOS
📦 What is this software?
Ipados by Apple
Ipados by Apple
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with kernel-level privileges leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Malicious font files delivered via phishing or compromised websites lead to user-level code execution, potentially escalating to full system access.
If Mitigated
With proper patching, the vulnerability is eliminated; with network controls, malicious font delivery can be blocked.
🎯 Exploit Status
Exploitation requires user interaction to process malicious font files. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: macOS Big Sur 11.7.5, macOS Ventura 13.3, macOS Monterey 12.6.4, iOS 16.4, iPadOS 16.4, iOS 15.7.4, iPadOS 15.7.4
Vendor Advisory: https://support.apple.com/en-us/HT213670
Restart Required: Yes
Instructions:
1. Go to System Settings > General > Software Update. 2. Install available updates. 3. Restart device when prompted.
🔧 Temporary Workarounds
Block suspicious font files
allUse email/web gateways to block .ttf, .otf, and other font file attachments from untrusted sources.
User education
allTrain users not to open font files from unknown sources and to verify file extensions.
🧯 If You Can't Patch
- Implement application allowlisting to prevent unauthorized font processing applications.
- Use network segmentation to isolate vulnerable systems from internet and untrusted networks.
🔍 How to Verify
Check if Vulnerable:
Check current OS version against affected versions list. On macOS: System Settings > General > About. On iOS/iPadOS: Settings > General > About.Check Version:
macOS: sw_vers -productVersion; iOS/iPadOS: Settings > General > About > VersionVerify Fix Applied:
Verify OS version matches or exceeds patched versions listed in fix_official.patch_version.📡 Detection & Monitoring
Log Indicators:
- Unusual font file processing from untrusted sources
- Crash reports from font processing services
Network Indicators:
- Downloads of font files from suspicious domains
- Font file transfers via email attachments
SIEM Query:
source="*font*" AND (event="crash" OR event="malicious")🔗 References
- https://support.apple.com/en-us/HT213670
- https://support.apple.com/en-us/HT213673
- https://support.apple.com/en-us/HT213675
- https://support.apple.com/en-us/HT213676
- https://support.apple.com/en-us/HT213677
- https://support.apple.com/en-us/HT213670
- https://support.apple.com/en-us/HT213673
- https://support.apple.com/en-us/HT213675
- https://support.apple.com/en-us/HT213676
- https://support.apple.com/en-us/HT213677
