CVE-2019-25468: NetGain EM Plus RCE Vulnerability

CVE-2019-25468 Overview

CVE-2019-25468 is a critical remote code execution vulnerability affecting NetGain EM Plus version 10.1.68. This command injection flaw allows unauthenticated attackers to execute arbitrary system commands by submitting malicious parameters to the script_test.jsp endpoint. Attackers can send POST requests with shell commands embedded in the content parameter to execute code on the underlying server and retrieve command output, enabling complete system compromise without requiring any authentication.

Critical Impact

Unauthenticated remote code execution allowing complete system takeover through command injection in the script_test.jsp endpoint.

Affected Products

• NetGain EM Plus 10.1.68

Discovery Timeline

• 2026-03-11 - CVE CVE-2019-25468 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2019-25468

Vulnerability Analysis

This vulnerability is classified as CWE-94 (Improper Control of Generation of Code), commonly known as code injection. The NetGain EM Plus network monitoring application fails to properly sanitize user-supplied input before passing it to system command execution functions. The script_test.jsp endpoint is designed to test scripts but lacks authentication requirements and input validation, creating a direct pathway for command injection attacks.

The attack requires no authentication, meaning any network-accessible attacker can exploit this vulnerability. The impact is severe, potentially leading to full compromise of confidentiality, integrity, and availability of the affected system. Attackers gaining code execution can install backdoors, exfiltrate sensitive monitoring data, pivot to other network systems, or deploy ransomware.

Root Cause

The root cause is improper input validation in the script_test.jsp endpoint. User-supplied data in the content parameter is passed directly to command execution functions without sanitization or encoding, allowing shell metacharacters and commands to be interpreted by the underlying operating system. The endpoint also lacks authentication controls, exposing this dangerous functionality to unauthenticated users.

Attack Vector

The attack is network-based and requires no user interaction or special privileges. An attacker sends a crafted HTTP POST request to the vulnerable /script_test.jsp endpoint with malicious shell commands embedded in the content parameter. The server executes these commands with the privileges of the web application process, typically allowing execution of arbitrary system commands. The command output may be returned in the HTTP response, providing direct feedback to the attacker.

The vulnerability is exploited by constructing POST requests containing operating system commands that chain with legitimate functionality. Common exploitation patterns include using semicolons, backticks, or pipe characters to inject secondary commands that establish reverse shells or download additional payloads.

Detection Methods for CVE-2019-25468

Indicators of Compromise

• HTTP POST requests to /script_test.jsp with suspicious content parameter values containing shell metacharacters
• Unusual process spawning from the Java web application process running NetGain EM Plus
• Unexpected outbound network connections from the NetGain server to external IP addresses
• Evidence of reconnaissance commands such as whoami, id, uname, or cat /etc/passwd in web server logs

Detection Strategies

• Monitor web server access logs for requests targeting /script_test.jsp from unauthorized sources
• Implement Web Application Firewall (WAF) rules to detect and block command injection patterns in POST parameters
• Deploy endpoint detection and response (EDR) solutions to identify anomalous process execution chains
• Configure intrusion detection systems (IDS) to alert on known exploitation signatures

Monitoring Recommendations

• Review access logs for the NetGain EM Plus application for unusual request patterns
• Monitor for processes spawned by the web application that execute shell commands
• Track outbound connections from the NetGain server, especially to non-standard ports
• Implement file integrity monitoring on critical system files and directories

How to Mitigate CVE-2019-25468

Immediate Actions Required

• Restrict network access to the NetGain EM Plus web interface using firewall rules to trusted IP addresses only
• Block external access to the /script_test.jsp endpoint at the network perimeter or via web server configuration
• Review server logs for evidence of prior exploitation attempts
• Consider taking the NetGain EM Plus instance offline until properly secured

Patch Information

Contact NetGain Systems for information regarding security updates. Review the VulnCheck Advisory and Exploit-DB #47391 for additional technical details regarding this vulnerability.

Workarounds

• Implement strict network segmentation to limit access to the NetGain EM Plus management interface
• Use a reverse proxy with authentication to protect the application if direct patching is not available
• Configure web server rules to deny access to script_test.jsp entirely
• Deploy a Web Application Firewall (WAF) with command injection protection rules

# Example: Block access to vulnerable endpoint using Apache .htaccess
<Location "/script_test.jsp">
    Require all denied
</Location>

# Example: Nginx configuration to block vulnerable endpoint
location /script_test.jsp {
    deny all;
    return 403;
}