CVE-2023-23499: Apple iPadOS Information Disclosure Bug

CVE-2023-23499 Overview

CVE-2023-23499 is an information disclosure vulnerability affecting multiple Apple operating systems that allows a malicious application to access user-sensitive data. The vulnerability stems from insufficient hardened runtime protections, which Apple addressed by enabling hardened runtime across affected components. This security control helps protect running processes against code injection, dynamic library hijacking, and process memory tampering.

Critical Impact

A malicious application running on an affected Apple device may be able to access user-sensitive data without proper authorization, potentially exposing personal information, credentials, or other confidential data stored on the device.

Affected Products

• Apple macOS Ventura (versions prior to 13.2)
• Apple macOS Monterey (versions prior to 12.6.3)
• Apple macOS Big Sur (versions prior to 11.7.3)
• Apple iOS (versions prior to 16.3)
• Apple iPadOS (versions prior to 16.3)
• Apple tvOS (versions prior to 16.3)
• Apple watchOS (versions prior to 9.3)

Discovery Timeline

• 2023-02-27 - CVE-2023-23499 published to NVD
• 2025-03-11 - Last updated in NVD database

Technical Details for CVE-2023-23499

Vulnerability Analysis

This vulnerability (CWE-200: Information Exposure) allows applications to bypass intended security boundaries and access sensitive user data. The root issue lies in components that were not properly configured with hardened runtime protections, which are designed to prevent unauthorized access to protected resources and system integrity violations.

Hardened runtime is an Apple security feature that restricts the capabilities of executable code at runtime. When properly enabled, it prevents applications from loading unsigned dynamic libraries, modifying executable memory, and accessing certain protected resources. Applications that lack hardened runtime protections may be exploited to access data they should not have permissions to read.

The local attack vector requires user interaction, meaning an attacker must convince a user to install and run a malicious application. Once executed, the application can leverage the missing hardened runtime protections to access confidential user data without triggering the expected security restrictions.

Root Cause

The vulnerability exists because certain system components were not configured with hardened runtime enabled. Without this protection layer, applications could potentially access user-sensitive data through mechanisms that should have been restricted. Apple's fix involves enabling hardened runtime on the affected components, thereby enforcing stricter code signing and memory protection requirements.

Attack Vector

Exploitation requires local access through a malicious application. The attacker must distribute a specially crafted application to the target device, typically through social engineering techniques to convince the user to install software from outside the App Store or through a compromised application. Once the malicious app is running, it can exploit the lack of hardened runtime protections to read sensitive user data.

The attack does not require elevated privileges initially, but user interaction is necessary to launch the malicious application. The exploitation primarily affects data confidentiality, allowing unauthorized information disclosure without impacting system integrity or availability.

Detection Methods for CVE-2023-23499

Indicators of Compromise

• Applications attempting to access sensitive user data directories such as ~/Library/Mail, ~/Library/Messages, or ~/Library/Cookies without proper entitlements
• Processes running without valid code signatures or with unsigned dynamic libraries loaded
• Unexpected applications accessing protected system resources or TCC-protected data categories
• Anomalous inter-process communication patterns from third-party applications

Detection Strategies

• Monitor system logs for TCC (Transparency, Consent, and Control) bypass attempts or unauthorized data access requests
• Implement endpoint detection rules that flag applications accessing sensitive directories without corresponding user consent prompts
• Use code signature verification to detect applications running without hardened runtime enabled
• Deploy behavioral analysis to identify applications exhibiting data exfiltration patterns

Monitoring Recommendations

• Enable unified logging on macOS systems and monitor for tccd and sandboxd entries indicating policy violations
• Configure alerts for unsigned code execution or applications that have disabled Library Validation
• Implement network monitoring to detect potential data exfiltration following unauthorized local access
• Regularly audit installed applications and their entitlements using codesign and spctl utilities

How to Mitigate CVE-2023-23499

Immediate Actions Required

• Update all affected Apple devices to the patched versions: macOS Ventura 13.2, macOS Monterey 12.6.3, macOS Big Sur 11.7.3, iOS 16.3, iPadOS 16.3, tvOS 16.3, and watchOS 9.3
• Enable automatic software updates on all Apple devices to receive future security patches promptly
• Review and audit installed applications, removing any untrusted or unnecessary software
• Ensure Gatekeeper is enabled and set to allow apps only from the App Store or identified developers

Patch Information

Apple has released security updates addressing this vulnerability across all affected platforms. Detailed patch information is available through Apple's security advisories:

• Apple Security Update HT213599 - tvOS 16.3
• Apple Security Update HT213601 - iOS 16.3 and iPadOS 16.3
• Apple Security Update HT213603 - macOS Big Sur 11.7.3
• Apple Security Update HT213604 - macOS Monterey 12.6.3
• Apple Security Update HT213605 - watchOS 9.3
• Apple Security Update HT213606 - macOS Ventura 13.2

Organizations should prioritize deployment of these updates through their mobile device management (MDM) solutions to ensure comprehensive coverage.

Workarounds

• Restrict application installations to App Store applications only via MDM profiles or Gatekeeper settings
• Enable FileVault encryption on macOS devices to add an additional layer of data protection
• Implement strict application whitelisting policies to prevent unauthorized software execution
• Educate users about the risks of installing applications from untrusted sources

# Verify Gatekeeper status and hardened runtime on macOS
spctl --status
# Check if an application has hardened runtime enabled
codesign -dv --verbose=4 /Applications/YourApp.app 2>&1 | grep -E "flags|runtime"
# List applications without proper code signatures
find /Applications -name "*.app" -exec codesign -dv {} \; 2>&1 | grep -B1 "not signed"