CVE-2026-24068

Summary

A missing authentication vulnerability (CVE-2026-24068) has been identified in the VSL privileged helper component on macOS systems. The helper utilizes NSXPCConnection for Inter-Process Communication (IPC) but fails to authenticate or authorize the calling client application (CWE-306).

Technical Details

The issue is classified under CWE-306 (Missing Authentication for Critical Function). On macOS, privileged helpers installed via SMJobBless operate as root and communicate with unprivileged application sandboxes using XPC. A secure implementation must verify the code-signing identity of the connecting client inside the listener:shouldAcceptNewConnection: delegate method.

In this vulnerability, the VSL helper blindly accepts incoming IPC messages from any process running on the host without auditing the caller's code signing certificate.

Exploitation Context

• Vector: Local
• Authentication: Not required
• Complexity: Low
• Impact: High (Confidentiality, Integrity, and Availability)

If the exposed XPC protocol includes methods that execute system commands, modify restricted files, or manipulate the kernel, any unprivileged malware on the device can commandeer the helper to achieve root access.

Remediation

Developers and users of the affected VSL component should immediately:

1. Update to the latest version of the VSL component provided by the manufacturer which implements strict connection validation.
2. For developers: implement audit_token_t verification inside the NSXPCListenerDelegate, using SecCodeCopyGuestWithAttributes to verify the caller has the exact Team ID and Bundle ID.
3. End-users should restrict application installation to trusted sources and monitor for unauthorized privilege escalation attempts.

Precogs AI Integration

The Precogs AI Binary Security Platform automatically hunts for dangerous IPC implementations. By tracing instances of NSXPCListener and verifying the presence of SecCodeCheckValidity or equivalent cryptographic validation inside the delegate handlers, Precogs prevents trivial Local Privilege Escalation vulnerabilities from reaching production builds.

Vulnerability Code Signature

Attack Data Flow

Vulnerable Code Pattern

# ❌ VULNERABLE: Unsanitized Input Flow
def process_request(request):
    user_input = request.GET.get('data')
    # Taint sink: processing untrusted data
    execute_logic(user_input)
    return {"status": "success"}

Secure Code Pattern

# ✅ SECURE: Input Validation & Sanitization
def process_request(request):
    user_input = request.GET.get('data')
    
    # Sanitized boundary check
    if not is_valid_format(user_input):
        raise ValueError("Invalid input format")
        
    sanitized_data = sanitize(user_input)
    execute_logic(sanitized_data)
    return {"status": "success"}

How Precogs Detects This

Precogs AI Analysis Engine maps untrusted input directly to execution sinks to catch complex application security vulnerabilities.\n