CVE-2025-4960: EPSON Privilege Escalation Vulnerability

CVE-2025-4960 Overview

A local privilege escalation vulnerability has been discovered in the com.epson.InstallNavi.helper tool, which is deployed with EPSON printer driver installers on macOS. The vulnerability stems from multiple implementation flaws that allow untrusted local users to perform privileged operations such as executing arbitrary commands or installing system components without requiring administrative credentials.

The helper tool fails to properly authenticate clients over the XPC protocol and does not correctly enforce macOS's authorization model, exposing privileged functionality to any local user. Although the service invokes the AuthorizationCopyRights API, it does so using overly permissive custom rights that it registers in the system's authorization database (/var/db/auth.db). These rights can be requested and granted by the authorization daemon to any local user, regardless of privilege level.

Critical Impact

Local attackers can exploit the vulnerable XPC service to execute arbitrary commands with elevated privileges or install system components without administrative credentials, potentially leading to full system compromise.

Affected Products

• EPSON Printer Driver Installers containing com.epson.InstallNavi.helper
• macOS systems with vulnerable EPSON printer software installed

Discovery Timeline

• 2026-02-19 - CVE-2025-4960 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2025-4960

Vulnerability Analysis

This vulnerability is classified under CWE-863 (Incorrect Authorization), representing a significant flaw in how the EPSON helper service implements access control on macOS. The core issue lies in the improper implementation of macOS's XPC security model and authorization framework.

The com.epson.InstallNavi.helper service is designed to perform privileged operations on behalf of the main installer application. However, the service registers custom authorization rights in the system's authorization database with overly permissive configurations. When any local process requests these rights from the authorization daemon, they are granted without proper verification of the requester's privilege level.

This design flaw effectively bypasses the intended security boundary between unprivileged users and administrative functionality. An attacker with local access can craft requests to the XPC service that leverage these permissive authorization rights to execute privileged operations.

Root Cause

The root cause of this vulnerability is twofold:

1. Improper XPC Client Authentication: The helper service does not properly validate the identity or privilege level of connecting XPC clients, accepting connections from any local process.

2. Overly Permissive Authorization Rights: The custom rights registered in /var/db/auth.db are configured to allow any local user to obtain authorization, rather than requiring administrative credentials or specific entitlements.

This combination allows privilege escalation because the macOS authorization framework trusts the custom rights definitions provided by the application, and those definitions fail to enforce proper access restrictions.

Attack Vector

The attack requires local access to a macOS system with the vulnerable EPSON printer driver software installed. An attacker would:

1. Identify the vulnerable com.epson.InstallNavi.helper XPC service
2. Establish a connection to the service using the XPC protocol
3. Request the custom authorization rights registered by the service
4. Once granted (which occurs without proper verification), invoke privileged functionality exposed by the helper service
5. Execute arbitrary commands or install system components with elevated privileges

The vulnerability can be exploited without any user interaction once an attacker has local access to the system. Technical details and proof-of-concept information are available through the Pentraze CVE-2025-4960 Report.

Detection Methods for CVE-2025-4960

Indicators of Compromise

• Unexpected connections to the com.epson.InstallNavi.helper XPC service from non-installer processes
• Modifications to /var/db/auth.db related to EPSON authorization rights
• Suspicious process execution chains originating from the EPSON helper service
• Unauthorized installation of system components through the EPSON helper framework

Detection Strategies

• Monitor XPC connections to com.epson.InstallNavi.helper and alert on connections from unexpected source processes
• Implement endpoint detection rules to identify privilege escalation patterns involving EPSON printer software
• Review system logs for authorization requests to EPSON-related custom rights from non-administrative users
• Deploy behavioral analysis to detect anomalous command execution following XPC service interactions

Monitoring Recommendations

• Enable comprehensive logging for XPC service connections on macOS endpoints
• Monitor authorization database modifications in /var/db/auth.db
• Implement alerting for privilege escalation attempts involving printer driver software
• Track process execution chains for helper services executing commands as root

How to Mitigate CVE-2025-4960

Immediate Actions Required

• Audit systems to identify installations of vulnerable EPSON printer driver software containing com.epson.InstallNavi.helper
• Consider uninstalling or disabling the EPSON printer software until a patched version is available
• Restrict local access to systems with the vulnerable software to trusted users only
• Implement endpoint protection solutions capable of detecting privilege escalation attempts
• Monitor for exploitation attempts while awaiting a vendor patch

Patch Information

No vendor patch information is currently available in the CVE data. Organizations should monitor Pentraze Vulnerability Reports and EPSON security communications for updates regarding a fix for this vulnerability.

Workarounds

• Manually remove or disable the com.epson.InstallNavi.helper service if the EPSON installer functionality is not required
• Restrict local user access on systems where the vulnerable software must remain installed
• Implement application whitelisting to prevent unauthorized processes from communicating with the XPC service
• Consider using alternative printing solutions until a patch is released

# Locate the vulnerable helper service
sudo find /Library -name "com.epson.InstallNavi.helper*" 2>/dev/null

# Check if the helper service is currently loaded
launchctl list | grep -i epson

# Review custom authorization rights in the auth database (requires root)
sudo security authorizationdb read com.epson.InstallNavi.helper