CVE-2025-47418

Executive Summary

CVE-2025-47418 is a vulnerability in Crestron Automate VX that allows an unauthorized actor to expose sensitive information, specifically the ability to remotely enable recording without any visible indication to the system’s users. This flaw enables functionality misuse, as an attacker can surreptitiously activate recording via a network API, compromising the confidentiality of meetings or sensitive discussions. The vulnerability affects versions from 5.6.8161.21536 through 6.4.0.49. No patch is currently available, and no public proof-of-concept or exploit code has been identified.

Supply Chain & Package Security

This vulnerability is not related to an NPM, PyPI, Go, or Ruby package. It is a hardware/software appliance vulnerability in Crestron’s Automate VX system.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, indicating that no official CVSS vector has been assigned. However, based on the description, the vulnerability has the following characteristics:

• Attack Vector (AV): Network (the recording can be enabled remotely via a network API)
• Attack Complexity (AC): Low (no special conditions required)
• Privileges Required (PR): None (unauthorized actor)
• User Interaction (UI): None
• Scope (S): Unchanged
• Confidentiality (C): High (sensitive information exposed)
• Integrity (I): None
• Availability (A): None

A reasonable CVSS vector would be: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N with a base score of 7.5 (High).

Deep Dive & Mechanics

The vulnerability lies in the Crestron Automate VX system’s network API, which controls recording functionality. The system fails to enforce authentication or authorization checks on the API endpoint that enables recording. Additionally, there is no visual or audible indicator (e.g., a recording light or on-screen notification) when recording is active. This allows an attacker on the same network to send a crafted API request to start recording without the knowledge of meeting participants.

The affected versions (5.6.8161.21536 through 6.4.0.49) likely use a RESTful or proprietary API over HTTP/HTTPS. The lack of authentication means any device on the network can trigger recording. The absence of a recording indicator means victims cannot detect the breach in real time.

Vulnerable vs. Patched Code

No patch is currently available. The vulnerable code likely resides in the API handler for recording control. A patched version would:

• Require authentication (e.g., API key or session token) for the recording endpoint.
• Add a mandatory visual indicator (e.g., a red dot or banner) when recording is active.
• Log all recording start/stop events for audit purposes.

Since no patch exists, no code comparison can be provided.

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Deploy Crestron Automate VX version 5.6.8161.21536 in a controlled network.
2. Identify the network API endpoint for recording (e.g., /api/recording/start).
3. Use a tool like curl or a custom script to send a POST request to the endpoint.

Exploitation Steps:

1. Scan the network for Crestron Automate VX devices (e.g., using Shodan or Nmap).
2. Send a request to start recording:

   curl -X POST http://<target-ip>/api/recording/start -H "Content-Type: application/json" -d '{"action":"start"}'
   

3. Verify recording is active by checking the system logs or network traffic (no visual indicator will appear on the device).

Note: No public exploit code is available. The above is a hypothetical example based on the vulnerability description.

Blue Team

Detection:

• Monitor network traffic for unusual POST requests to /api/recording/start or similar endpoints.
• Enable logging on the Crestron system (if supported) to capture API calls.
• Use network segmentation to restrict access to the Crestron system to authorized devices only.

Mitigation:

• Apply network access controls (e.g., firewall rules) to limit access to the API.
• Monitor for unauthorized recording activity via system logs.
• If possible, disable the remote recording API until a patch is available.

Indicators of Compromise (IOCs)

• Network Traffic: HTTP POST requests to /api/recording/start or similar endpoints from unauthorized IPs.
• Log Entries: Unusual recording start events in Crestron system logs without corresponding user authentication.
• System Behavior: Recording files appearing without any user-initiated action.

Detection Engineering

YARA Rule

rule CVE_2025_47418_Crestron_Recording_API {
    meta:
        description = "Detects network traffic or logs related to CVE-2025-47418 exploitation"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-47418"
    strings:
        $api_endpoint = "/api/recording/start" ascii wide nocase
        $recording_action = "action\":\"start" ascii wide nocase
    condition:
        any of them
}

Sigma Rule

title: Detection of CVE-2025-47418 Exploitation Attempt
id: 8a7b3c2d-1e5f-4a6b-9c8d-7e0f1a2b3c4d
status: experimental
description: Detects unauthorized attempts to start recording on Crestron Automate VX
author: Valters IT
date: 2025-04-10
logsource:
    category: network
    product: suricata
detection:
    selection:
        http.method: 'POST'
        http.url: '/api/recording/start'
    condition: selection
falsepositives:
    - Legitimate administrative actions (if authenticated)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-47418 - Crestron Automate VX Recording API Exploit"; flow:to_server; http.method; content:"POST"; http.uri; content:"/api/recording/start"; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Network Segmentation: Isolate Crestron Automate VX systems on a separate VLAN with strict access controls.
2. Disable Remote Recording: If possible, disable the remote recording API via the system configuration.
3. Monitor Logs: Enable and review system logs for unauthorized recording events.

Long-Term Fix:

• Apply a vendor patch when available (currently UNKNOWN/UNPATCHED).
• Implement authentication for all API endpoints.
• Add mandatory visual indicators for recording activity.

Workaround:

• Use a firewall to block external access to the Crestron system’s API port (e.g., TCP 80/443).
• Require VPN access for any remote management.

Valters IT
DevSecOps & Cyber Threat Intelligence