CVE-2025-43318: Apple macOS Privilege Escalation Vulnerability

CVE-2025-43318 Overview

CVE-2025-43318 is a missing authorization vulnerability [CWE-862] in Apple macOS. An application running with root privileges can bypass entitlement checks to access private information stored on the system. Apple addressed the issue by adding additional entitlement checks in macOS Tahoe 26.

The flaw requires local access and elevated privileges to exploit. While the attack complexity is low, the attacker must already possess root on the target system. Successful exploitation results in disclosure of sensitive data without affecting integrity or availability.

Critical Impact
An application with root privileges can access private information that should be protected by macOS entitlement enforcement, enabling data disclosure on affected systems.

Affected Products

Apple macOS versions prior to macOS Tahoe 26
Systems where root-capable applications process privileged data
macOS endpoints running unpatched builds referenced in Apple advisory HT125110

Discovery Timeline

2025-09-15 - CVE-2025-43318 published to the National Vulnerability Database
2025-09-15 - Apple publishes security advisory for macOS Tahoe 26
2026-09-30 - Last updated in NVD database

Technical Details for CVE-2025-43318

Vulnerability Analysis

The vulnerability is classified as missing authorization [CWE-862]. macOS relies on entitlements, which are signed key-value pairs embedded in application binaries, to gate access to protected resources and APIs. When a system component fails to verify a caller's entitlements before releasing protected data, any process with sufficient privileges can request that data.

In this case, a root-privileged application can obtain private information that entitlement enforcement is designed to restrict. Apple's advisory states the fix adds additional entitlement checks, confirming that prior builds did not validate the caller's entitlement set at the protected code path.

Root Cause

The root cause is incomplete authorization logic in a macOS system service. Root privilege alone was treated as sufficient to access certain private information, rather than requiring both root privilege and the specific entitlement intended to gate the data. This design assumption violates the principle of least privilege, since many legitimate root processes do not require access to the protected data in question.

Attack Vector

Exploitation requires local code execution with root privileges on the target macOS device. An attacker who has already escalated to root through a separate vulnerability, malicious installer, or supply-chain compromise can invoke the affected interface and retrieve private information. The vulnerability does not provide initial access or privilege escalation on its own.

No public proof-of-concept, Metasploit module, or exploit database entry is referenced in the available data. The issue is documented in the Apple Security Advisory and the Full Disclosure Security Post.

// No verified exploit code is available for CVE-2025-43318.
// The vulnerability is triggered when a root-privileged process
// invokes a macOS system interface that returns private information
// without validating the caller's required entitlement.

Detection Methods for CVE-2025-43318

Indicators of Compromise

Unexpected processes running as root that query macOS system services associated with private user data
Installation of unsigned or ad-hoc signed binaries that request elevated privileges outside normal management workflows
Access to macOS system frameworks and XPC services by processes with no legitimate business need for private information

Detection Strategies

Inventory macOS endpoints and identify systems running builds prior to macOS Tahoe 26 using configuration management or MDM reporting
Audit launchd items, LaunchDaemons, and LaunchAgents for recently added entries that execute as root
Correlate root-level process execution with access to Transparency, Consent, and Control (TCC) protected locations and private data stores

Monitoring Recommendations

Alert on new root-privileged processes that are not part of an approved software baseline
Monitor Unified Log entries for sudo, authorization, and entitlement-related subsystems to surface anomalous privileged activity
Track endpoint patch state against Apple advisory HT125110 and flag devices that remain on vulnerable macOS versions

How to Mitigate CVE-2025-43318

Immediate Actions Required

Upgrade affected systems to macOS Tahoe 26 or later, where Apple added the required entitlement checks
Review and remove unnecessary applications and agents that execute with root privileges on managed endpoints
Enforce code signing and notarization requirements through MDM policy to limit which binaries can run as root

Patch Information

Apple fixed CVE-2025-43318 in macOS Tahoe 26 by adding additional entitlement checks on the affected code path. Deploy the update through Software Update, Apple Business Manager, or your MDM solution. Full details are available in the Apple Security Advisory.

Workarounds

Restrict administrative and root access using Privileged Access Management controls on macOS endpoints
Apply application allowlisting to prevent untrusted binaries from executing with elevated privileges
Enable System Integrity Protection (SIP) and verify it is not disabled on managed systems

bash

# Verify macOS version against the patched release
sw_vers -productVersion

# Confirm System Integrity Protection status
csrutil status

# Trigger macOS software update to install the patched build
sudo softwareupdate --install --all --restart