CVE-2025-4008: Smartbedded Meteobridge VM RCE Vulnerability

CVE-2025-4008 Overview

CVE-2025-4008 is a critical command injection vulnerability affecting the Smartbedded Meteobridge web interface. The Meteobridge platform allows administrators to manage weather station data collection through a web application built with CGI shell scripts and C. This web interface exposes an endpoint that is vulnerable to command injection, enabling remote unauthenticated attackers to gain arbitrary command execution with elevated privileges (root) on affected devices.

Critical Impact

Remote unauthenticated attackers can achieve root-level command execution on Meteobridge devices via command injection in the web interface. This vulnerability is actively exploited in the wild and is listed in the CISA Known Exploited Vulnerabilities catalog.

Affected Products

• Smartbedded Meteobridge VM (all versions)
• Smartbedded Meteobridge Firmware (all versions)

Discovery Timeline

• May 21, 2025 - CVE-2025-4008 published to NVD
• October 27, 2025 - Last updated in NVD database

Technical Details for CVE-2025-4008

Vulnerability Analysis

This command injection vulnerability (CWE-77) exists in the Meteobridge web interface, which is implemented using CGI shell scripts and C code. The vulnerability allows attackers on an adjacent network to inject and execute arbitrary operating system commands without requiring any authentication. The exploitation results in command execution with root privileges, giving attackers complete control over the affected device.

The Meteobridge platform is designed to collect and process weather station data, making it a common deployment in IoT and embedded environments. The web interface provides administrative functionality that, when exploited, can compromise the entire device and potentially serve as a pivot point for attacks on connected networks.

Root Cause

The root cause of CVE-2025-4008 is improper input validation and sanitization in the CGI-based web interface. User-supplied input is passed directly to shell commands without adequate escaping or filtering, allowing attackers to break out of the intended command context and inject malicious commands. This is a classic command injection pattern where shell metacharacters are not properly neutralized before being used in system calls.

Attack Vector

The attack vector requires adjacent network access, meaning attackers must be on the same network segment as the vulnerable Meteobridge device. No authentication is required to exploit this vulnerability, and no user interaction is needed. An attacker can craft malicious HTTP requests to the vulnerable CGI endpoint, embedding shell commands that will be executed by the server with root privileges.

The exploitation workflow typically involves:

1. Identifying a Meteobridge device on the local network
2. Sending a crafted HTTP request to the vulnerable CGI endpoint
3. Injecting shell metacharacters and commands into vulnerable parameters
4. Achieving arbitrary command execution as root on the target device

Detection Methods for CVE-2025-4008

Indicators of Compromise

• Unexpected outbound network connections from Meteobridge devices
• Unusual process spawning from the web server or CGI processes
• Modified system files or unexpected cron jobs on Meteobridge systems
• Evidence of shell command injection patterns in web server access logs

Detection Strategies

• Monitor HTTP traffic to Meteobridge devices for suspicious payloads containing shell metacharacters (;, |, $(), backticks)
• Implement network segmentation alerts for unexpected traffic from IoT/weather monitoring devices
• Deploy intrusion detection signatures targeting command injection patterns in CGI requests
• Audit system logs on Meteobridge devices for evidence of unauthorized command execution

Monitoring Recommendations

• Enable verbose logging on Meteobridge web interfaces and forward logs to a SIEM
• Implement network-level monitoring for traffic anomalies involving weather station infrastructure
• Deploy endpoint detection on network segments containing Meteobridge devices to identify post-exploitation activity

How to Mitigate CVE-2025-4008

Immediate Actions Required

• Restrict network access to Meteobridge devices to trusted administrative systems only
• Implement network segmentation to isolate weather monitoring infrastructure from critical networks
• Apply available firmware updates immediately as this vulnerability is actively exploited
• Review Meteobridge device logs for evidence of prior exploitation attempts

Patch Information

Smartbedded has addressed this vulnerability in updated firmware releases. Administrators should consult the Meteohub Forum Discussion for official guidance on obtaining and applying the security update. Given that this vulnerability is listed in the CISA Known Exploited Vulnerabilities Catalog, immediate patching is strongly recommended.

For detailed technical analysis, refer to the OneKey Security Advisory.

Workarounds

• Place Meteobridge devices behind a firewall with strict access control rules limiting access to authorized IP addresses
• Disable or restrict access to the web interface if not actively required for operations
• Implement a VPN requirement for remote administrative access to weather monitoring infrastructure

# Example: Restrict access to Meteobridge web interface using iptables
# Allow only specific management IP to access the web interface
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP