CVE-2025-43333: Apple macOS Privilege Escalation Flaw

CVE-2025-43333 Overview

CVE-2025-43333 is a local privilege escalation vulnerability in Apple macOS. The flaw stems from improper permissions enforcement that allows a malicious application to gain root privileges on an affected system. Apple addressed the issue in macOS Tahoe 26 by applying additional restrictions to the affected component.

The vulnerability is categorized under [CWE-269] Improper Privilege Management. Exploitation requires local access and user interaction, but successful exploitation results in full compromise of confidentiality, integrity, and availability. Apple published the fix in support advisory 125110, and the issue was also disclosed through the Full Disclosure mailing list.

Critical Impact
A locally executed application can elevate to root, granting full administrative control over the macOS host.

Affected Products

Apple macOS versions prior to macOS Tahoe 26
Systems running unpatched macOS where third-party applications can be executed
macOS endpoints without current Apple security updates applied

Discovery Timeline

2025-09-15 - CVE-2025-43333 published to the National Vulnerability Database (NVD)
2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-43333

Vulnerability Analysis

The vulnerability arises from a permissions issue within a macOS component that did not sufficiently restrict access to a privileged operation. An application running with standard user privileges can leverage the weakness to obtain root-level execution. Apple's advisory describes the fix as the addition of further restrictions, indicating the original implementation granted broader access than intended.

Local privilege escalation flaws of this class are commonly chained with initial-access techniques such as malicious application installers, trojanized utilities, or post-compromise tooling. Once root is obtained, an attacker can disable security controls, install persistent kernel-level components, access protected user data, and tamper with system integrity protections.

Root Cause

The root cause is improper privilege management ([CWE-269]) in a macOS subsystem. The affected code path did not enforce the principle of least privilege, allowing an unprivileged caller to invoke or influence a privileged operation. Apple's remediation introduced additional permission checks rather than redesigning the affected interface, suggesting the original control was present but insufficiently scoped.

Attack Vector

The attack vector is local. An attacker must first deliver and execute code on the target macOS system, typically through a downloaded application, supply-chain compromise, or social engineering. User interaction is required, consistent with macOS application launch workflows. After execution, the malicious app invokes the vulnerable interface and obtains root privileges without prompting for administrative credentials. See the Apple Support Article and the Full Disclosure Security Post for vendor and disclosure details.

Detection Methods for CVE-2025-43333

Indicators of Compromise

Unexpected processes running as root that were spawned by user-context applications
New or modified files under /Library/LaunchDaemons/, /private/etc/, or other root-owned paths shortly after a non-privileged application launch
Audit log (/var/audit/) entries showing privilege transitions without corresponding authentication prompts
Unsigned or ad-hoc signed binaries executing with elevated privileges

Detection Strategies

Monitor process ancestry for child processes that escalate effective UID to 0 without an authd or sudo authorization event
Alert on user applications invoking privileged XPC services or helper tools outside of expected patterns
Correlate file integrity changes in system directories with the originating user-context process

Monitoring Recommendations

Forward Endpoint Security Framework (ESF) telemetry and Unified Logs to a centralized analytics platform for retention and correlation
Baseline normal privileged-helper invocation patterns and flag deviations
Track macOS version inventory to identify hosts not yet running macOS Tahoe 26

How to Mitigate CVE-2025-43333

Immediate Actions Required

Upgrade all affected endpoints to macOS Tahoe 26 or later, which contains the official Apple fix
Inventory macOS hosts and prioritize patching systems used by privileged users, developers, and administrators
Restrict installation of untrusted applications via Gatekeeper, notarization enforcement, and managed configuration profiles

Patch Information

Apple resolved CVE-2025-43333 in macOS Tahoe 26 by adding additional permission restrictions to the affected component. Patch details are documented in the Apple Support Article 125110. Administrators should deploy the update through Software Update, MDM, or Apple Business Manager.

Workarounds

Limit local code execution by enforcing application allowlists through MDM policy
Require standard (non-administrator) accounts for daily use to reduce the surface for chained attacks
Enable System Integrity Protection (SIP) and Gatekeeper, and block execution of unsigned or non-notarized binaries until patching is complete

bash

# Verify current macOS version and confirm patch status
sw_vers -productVersion

# Trigger Software Update to retrieve macOS Tahoe 26
sudo softwareupdate --install --all --restart