CVE-2025-50193: Chamilo LMS RCE Vulnerability

CVE-2025-50193 Overview

CVE-2025-50193 is an OS command injection vulnerability in Chamilo, an open-source learning management system (LMS). The vulnerability exists in the /plugin/vchamilo/views/import.php endpoint, where the to_main_database POST parameter is not properly sanitized before being used in OS command execution. This allows authenticated attackers with high privileges to execute arbitrary system commands on the underlying server.

Critical Impact

Successful exploitation allows remote attackers with administrative privileges to execute arbitrary operating system commands on the server hosting the Chamilo LMS installation, potentially leading to complete system compromise.

Affected Products

• Chamilo LMS versions prior to 1.11.30
• Chamilo LMS vchamilo plugin installations

Discovery Timeline

• 2026-03-02 - CVE-2025-50193 published to NVD
• 2026-03-03 - Last updated in NVD database

Technical Details for CVE-2025-50193

Vulnerability Analysis

This OS command injection vulnerability (CWE-78) occurs within the vchamilo plugin's import functionality. The vulnerable endpoint at /plugin/vchamilo/views/import.php accepts a POST parameter named to_main_database that is passed to system-level commands without adequate sanitization or validation.

Command injection vulnerabilities arise when user-controlled input is incorporated into operating system commands without proper escaping or validation. In this case, an attacker with high-level privileges (such as a platform administrator) can craft malicious input containing shell metacharacters or command separators to break out of the intended command context and execute arbitrary commands.

The network-accessible nature of the vulnerability means that it can be exploited remotely by an authenticated attacker who has access to the administrative interface. While high privileges are required to reach the vulnerable endpoint, this does not significantly diminish the risk in scenarios where administrator accounts are compromised or in insider threat situations.

Root Cause

The root cause is improper input validation and sanitization of the to_main_database POST parameter in the vchamilo plugin's import functionality. The application fails to properly escape or validate user-supplied input before passing it to functions that execute operating system commands, violating the principle of treating all user input as untrusted.

Attack Vector

The attack is carried out over the network against the web application interface. An authenticated attacker with high privileges sends a specially crafted HTTP POST request to /plugin/vchamilo/views/import.php with malicious shell commands embedded within the to_main_database parameter. Common injection techniques include using command separators such as semicolons, pipes, or backticks to append or chain additional commands to the legitimate database operation.

The attack flow involves:

1. Authenticating to the Chamilo LMS with administrative privileges
2. Navigating to or directly accessing the vchamilo plugin's import functionality
3. Intercepting the POST request and modifying the to_main_database parameter to include malicious shell commands
4. Submitting the crafted request to trigger command execution on the server

For detailed technical information about this vulnerability, refer to the GitHub Security Advisory GHSA-hvpp-6mp9-frx4.

Detection Methods for CVE-2025-50193

Indicators of Compromise

• Unusual HTTP POST requests to /plugin/vchamilo/views/import.php with suspicious characters in the to_main_database parameter
• Web server logs showing requests containing shell metacharacters (;, |, &, `, $()) in POST data to the vchamilo import endpoint
• Unexpected processes spawned by the web server user (e.g., www-data, apache, nginx)
• Evidence of reverse shell connections or outbound connections from the web server to unknown destinations

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block command injection patterns in POST parameters targeting Chamilo endpoints
• Monitor web server access logs for requests to /plugin/vchamilo/views/import.php with anomalous parameter values
• Implement process monitoring on the web server to detect child processes spawned from PHP that execute unexpected system commands
• Review Chamilo audit logs for administrative actions involving the vchamilo plugin

Monitoring Recommendations

• Enable verbose logging for the Chamilo application and web server to capture full request details including POST bodies
• Set up alerting for process execution anomalies on servers hosting Chamilo LMS
• Monitor network traffic from the web server for unusual outbound connections that may indicate post-exploitation activity
• Implement file integrity monitoring on critical system directories to detect unauthorized modifications

How to Mitigate CVE-2025-50193

Immediate Actions Required

• Upgrade Chamilo LMS to version 1.11.30 or later immediately
• If immediate patching is not possible, disable or restrict access to the vchamilo plugin until the update can be applied
• Audit administrative accounts and ensure strong authentication mechanisms are in place
• Review server logs for any evidence of prior exploitation attempts

Patch Information

Chamilo has addressed this vulnerability in version 1.11.30. The fix involves proper sanitization of the to_main_database parameter before it is used in system commands. Organizations should upgrade to Chamilo v1.11.30 or later. The specific code changes can be reviewed in the GitHub commit.

Workarounds

• Disable the vchamilo plugin if it is not actively required for your deployment
• Implement network-level access controls to restrict access to the administrative interface to trusted IP ranges only
• Deploy a Web Application Firewall (WAF) with rules to block common OS command injection patterns
• Consider placing the Chamilo installation behind a VPN for additional access control

# Example: Restrict access to vchamilo plugin directory via Apache
<Directory /var/www/chamilo/plugin/vchamilo>
    Order Deny,Allow
    Deny from all
    Allow from 10.0.0.0/8
    Allow from 192.168.1.0/24
</Directory>