CVE-2026-24070: Native Access Privilege Escalation Flaw

CVE-2026-24070 Overview

A privilege escalation vulnerability exists in the Native Instruments Native Access application for macOS. During installation, a privileged helper (com.native-instruments.NativeAccess.Helper2) is deployed that handles privileged operations via XPC communication, including file copying, removal, and permission modifications. The Native Access application was signed with dangerous entitlements (com.apple.security.cs.allow-dyld-environment-variables and com.apple.security.cs.disable-library-validation) that enable DYLIB injection attacks. A low-privileged local attacker can exploit this vulnerability to inject malicious code into the application context and subsequently abuse the privileged XPC helper service to achieve full privilege escalation.

Critical Impact
Low-privileged local users can escalate to root privileges by exploiting DYLIB injection to manipulate the /etc/sudoers file through the privileged XPC helper service.

Affected Products

Native Instruments Native Access (macOS)
Systems with com.native-instruments.NativeAccess.Helper2 privileged helper installed

Discovery Timeline

2026-02-02 - CVE-2026-24070 published to NVD
2026-02-03 - Last updated in NVD database

Technical Details for CVE-2026-24070

Vulnerability Analysis

This vulnerability is classified as CWE-426 (Untrusted Search Path). The root issue stems from the Native Access application being signed with two particularly dangerous macOS entitlements that undermine the security model intended to protect privileged XPC communication.

The XPC service properly implements code signing verification, only allowing communication from processes signed with the Developer ID Application: Native Instruments GmbH (83K5EG6Z9V) certificate. However, this security control is effectively bypassed due to the entitlements applied to the Native Access application itself.

Root Cause

The Native Access application includes two problematic entitlements in its code signature:

com.apple.security.cs.allow-dyld-environment-variables - This entitlement permits the dynamic linker (dyld) to honor environment variables such as DYLD_INSERT_LIBRARIES, which allows arbitrary dynamic libraries to be injected into the process at launch.
com.apple.security.cs.disable-library-validation - This entitlement disables library validation, allowing the application to load unsigned or third-party libraries that would normally be rejected.

The combination of these entitlements creates a critical attack surface where an attacker can inject a malicious DYLIB into the Native Access process, gaining code execution within an application that has authorized access to the privileged XPC helper service.

Attack Vector

The attack is executed locally and requires low-level user privileges. An attacker can exploit this vulnerability through the following method:

The attacker crafts a malicious dynamic library (DYLIB) containing code that interacts with the com.native-instruments.NativeAccess.Helper2 XPC service. By setting the DYLD_INSERT_LIBRARIES environment variable to point to this malicious library before launching Native Access, the attacker's code is injected into the application's process space.

Once executing within the context of the signed Native Access application, the injected code passes the XPC service's code signing verification checks. The attacker can then invoke privileged helper functions to:

Delete the existing /etc/sudoers file using the remove function
Copy a malicious version of the sudoers file to /etc/sudoers using the copy-file function
Optionally modify file permissions using the set-permissions function

With a compromised sudoers file, the attacker can grant themselves passwordless sudo access, achieving complete root privilege escalation.

Detection Methods for CVE-2026-24070

Indicators of Compromise

Unusual DYLD_INSERT_LIBRARIES environment variable values when Native Access processes are spawned
Unexpected modifications to /etc/sudoers or other critical system files
Unknown or suspicious DYLIB files loaded into Native Access application processes
XPC communication logs showing unusual file operations from the privileged helper

Detection Strategies

Monitor process creation events for Native Access with DYLD_INSERT_LIBRARIES environment variable set
Implement file integrity monitoring on critical system files including /etc/sudoers, /etc/passwd, and similar configuration files
Audit XPC service activity from com.native-instruments.NativeAccess.Helper2 for unexpected file system operations
Deploy endpoint detection rules to identify DYLIB injection attempts against signed applications

Monitoring Recommendations

Enable macOS Unified Logging for XPC service events and filter for Native Instruments helper activity
Configure SentinelOne agents to monitor for suspicious dynamic library loading patterns
Establish baselines for legitimate Native Access XPC operations to detect anomalous behavior
Monitor for process launches with DYLD-related environment variables targeting trusted applications

How to Mitigate CVE-2026-24070

Immediate Actions Required

Review systems for any unauthorized modifications to /etc/sudoers and other critical configuration files
Consider temporarily removing or disabling the Native Access application until a patch is available
Restrict local user access on systems where Native Access is installed in multi-user environments
Implement application whitelisting to prevent execution of unauthorized DYLIB files

Patch Information

Refer to the SEC Consult Security Advisory for the latest information on available patches from Native Instruments. Organizations should monitor for updated versions of Native Access that remove the dangerous entitlements from the application signature.

Workarounds

Restrict installation of Native Access to dedicated audio workstations with limited user accounts
Implement strict access controls limiting who can execute the Native Access application
Use macOS configuration profiles to prevent unauthorized environment variable injection where possible
Deploy file integrity monitoring solutions to detect and alert on unauthorized changes to system configuration files

bash

# Monitor for DYLIB injection attempts against Native Access
# Add to security monitoring scripts
log stream --predicate 'process == "Native Access" AND eventMessage CONTAINS "DYLD"' --level debug

# Check for unauthorized sudoers modifications
sudo visudo -c
md5 /etc/sudoers