CVE-2023-32400: Apple iPadOS Auth Bypass Vulnerability

CVE-2023-32400 Overview

CVE-2023-32400 is an improper preservation of permissions vulnerability affecting multiple Apple operating systems. The flaw allows entitlements and privacy permissions granted to a legitimate application to be exploited by a malicious app. This vulnerability was addressed by Apple with improved checks in the affected components.

Critical Impact

A malicious application could leverage entitlements and privacy permissions granted to another app, potentially gaining unauthorized access to sensitive system resources and user data without explicit user consent.

Affected Products

• Apple iOS (versions prior to 16.5)
• Apple iPadOS (versions prior to 16.5)
• Apple macOS Ventura (versions prior to 13.4)
• Apple watchOS (versions prior to 9.5)

Discovery Timeline

• 2023-06-23 - CVE-2023-32400 published to NVD
• 2024-12-05 - Last updated in NVD database

Technical Details for CVE-2023-32400

Vulnerability Analysis

This vulnerability stems from improper preservation of permissions (CWE-281) within Apple's entitlement and permission handling subsystem. The flaw exists in how the operating system manages and isolates permission grants between applications.

In Apple's security model, entitlements define the specific capabilities an app can access, such as location services, contacts, or camera access. When a user grants these permissions to a legitimate application, the system should ensure strict isolation so that other applications cannot leverage those permissions. CVE-2023-32400 breaks this isolation barrier, allowing a malicious application to inherit or access the entitlements granted to a different app on the same device.

The attack requires local access, meaning an attacker would need to either convince a user to install a malicious application or compromise an existing application on the device. While no remote exploitation vector exists, the potential for integrity violations remains significant given the sensitive nature of iOS, iPadOS, macOS, and watchOS entitlements.

Root Cause

The root cause lies in insufficient validation checks within Apple's permission management framework. The system failed to properly verify the source application when processing entitlement requests, allowing cross-application permission leakage. This improper permission preservation meant that the boundaries between application sandboxes could be circumvented under specific conditions.

Attack Vector

The attack requires local access and user interaction. An attacker would need to craft a malicious application that exploits the permission handling flaw. Once installed on the target device, the malicious app could attempt to leverage entitlements granted to other legitimate applications.

The exploitation scenario typically involves:

1. A user installs a seemingly legitimate application that contains malicious code
2. The user grants sensitive permissions to other trusted apps on their device
3. The malicious application exploits the improper permission isolation to access those entitlements
4. The attacker gains access to sensitive data or capabilities without the user's explicit consent for that specific malicious app

Due to the nature of this vulnerability, no code-based exploitation example is available. The vulnerability exists within Apple's proprietary permission handling subsystem. For complete technical details, refer to the Apple Security Advisory HT213757 and related security advisories.

Detection Methods for CVE-2023-32400

Indicators of Compromise

• Unusual application behavior where apps access resources they shouldn't have permissions for
• Privacy permission alerts appearing for applications that weren't explicitly granted those permissions
• System logs showing entitlement access from unexpected application bundle identifiers
• Anomalous data access patterns from installed third-party applications

Detection Strategies

• Monitor application entitlement usage through Apple's Console application for unexpected permission access
• Review installed applications for any that were not intentionally installed from the App Store
• Utilize Mobile Device Management (MDM) solutions to audit application permissions and detect anomalies
• Implement application allowlisting to prevent unauthorized software installation

Monitoring Recommendations

• Enable verbose logging for application permission requests where possible
• Regularly audit which applications have been granted sensitive entitlements
• Monitor for new application installations and verify their legitimacy
• Use endpoint detection and response (EDR) solutions capable of monitoring Apple device permission usage

How to Mitigate CVE-2023-32400

Immediate Actions Required

• Update iOS devices to version 16.5 or later
• Update iPadOS devices to version 16.5 or later
• Update macOS Ventura systems to version 13.4 or later
• Update watchOS devices to version 9.5 or later
• Review and remove any suspicious or unnecessary third-party applications

Patch Information

Apple has addressed this vulnerability with improved checks in the following releases:

• iOS 16.5 and iPadOS 16.5 - See Apple Security Advisory HT213757
• watchOS 9.5 - See Apple Security Advisory HT213758
• macOS Ventura 13.4 - See Apple Security Advisory HT213764

Organizations should prioritize deploying these updates across all managed Apple devices to remediate the vulnerability.

Workarounds

• Restrict application installation to only vetted applications from the official App Store
• Enable Apple's built-in security features such as Lockdown Mode for high-risk users
• Implement Mobile Device Management (MDM) to enforce application restrictions
• Regularly review and revoke unnecessary permissions from installed applications

# Check current iOS/iPadOS version via command line (macOS connected device)
cfgutil get deviceName buildVersion

# Verify macOS Ventura version
sw_vers -productVersion

# List all installed applications for audit purposes (macOS)
mdfind "kMDItemContentType == 'com.apple.application-bundle'" -onlyin /Applications