CVE-2025-40716: Quiter Gateway SQL Injection Vulnerability

CVE-2025-40716 Overview

CVE-2025-40716 is a critical SQL injection vulnerability affecting Quiter Gateway versions prior to 4.7.0. This vulnerability allows an unauthenticated attacker to retrieve, create, update, and delete database records through the suceso.contenido mensaje parameter in the /QMSCliente/Sucesos.action endpoint. SQL injection vulnerabilities of this nature can lead to complete database compromise, unauthorized data access, and potential lateral movement within affected environments.

Critical Impact

Unauthenticated attackers can perform full CRUD (Create, Read, Update, Delete) operations on backend databases, potentially leading to complete data breach, data manipulation, or destruction of critical business information.

Affected Products

• Quiter Gateway versions prior to 4.7.0

Discovery Timeline

• 2025-07-08 - CVE-2025-40716 published to NVD
• 2025-10-18 - Last updated in NVD database

Technical Details for CVE-2025-40716

Vulnerability Analysis

This SQL injection vulnerability exists within the Quiter Gateway application's event handling functionality. The vulnerable endpoint /QMSCliente/Sucesos.action fails to properly sanitize user-supplied input in the suceso.contenido mensaje parameter before incorporating it into SQL queries. This allows attackers to inject arbitrary SQL commands that are executed directly against the backend database with the application's privileges.

The network-accessible nature of this vulnerability combined with no authentication requirements makes it particularly dangerous. An attacker requires no prior access or credentials to exploit this flaw, and successful exploitation grants complete control over database operations including the ability to exfiltrate sensitive data, modify records, or delete entire tables.

Root Cause

The root cause of CVE-2025-40716 is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command). The application fails to implement proper input validation and parameterized queries when handling the suceso.contenido mensaje parameter. User-supplied input is concatenated directly into SQL statements without adequate sanitization or the use of prepared statements, creating a classic SQL injection condition.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication and no user interaction. An attacker can craft malicious HTTP requests to the /QMSCliente/Sucesos.action endpoint, embedding SQL payloads within the suceso.contenido mensaje parameter. These payloads are then processed by the application and executed against the database.

Typical exploitation scenarios include:

• Data Exfiltration: Using UNION-based or error-based SQL injection techniques to extract sensitive information from the database
• Data Manipulation: Inserting, updating, or deleting records to corrupt business data or create unauthorized accounts
• Privilege Escalation: Modifying user privilege levels or authentication data to gain elevated access
• Database Enumeration: Discovering database schema, table structures, and stored procedures for further attack planning

The vulnerability can be exploited by sending crafted POST requests to the vulnerable endpoint with SQL metacharacters and commands embedded in the vulnerable parameter. For detailed technical information, refer to the INCIBE Security Notice.

Detection Methods for CVE-2025-40716

Indicators of Compromise

• Unusual database queries containing SQL keywords like UNION, SELECT, INSERT, UPDATE, DELETE, or DROP originating from web application logs
• HTTP requests to /QMSCliente/Sucesos.action containing SQL metacharacters such as single quotes ('), double dashes (--), or semicolons (;) in the suceso.contenido mensaje parameter
• Database error messages appearing in application logs indicating malformed queries or syntax errors
• Unexpected database modifications, deletions, or new records created without corresponding legitimate application activity

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the /QMSCliente/Sucesos.action endpoint
• Implement database activity monitoring to alert on anomalous query patterns, especially those containing multiple SQL statements or unauthorized data access
• Configure application logging to capture full request parameters for the Sucesos.action endpoint and analyze for injection attempts
• Use intrusion detection systems (IDS) with signatures for SQL injection attack patterns in HTTP POST requests

Monitoring Recommendations

• Enable detailed logging for all requests to the Quiter Gateway application, particularly the /QMSCliente/Sucesos.action endpoint
• Monitor database query logs for queries originating from the application that contain unexpected SQL commands or syntax
• Set up alerts for database operations that occur outside of normal business hours or exceed baseline thresholds
• Implement file integrity monitoring on database files to detect unauthorized modifications

How to Mitigate CVE-2025-40716

Immediate Actions Required

• Upgrade Quiter Gateway to version 4.7.0 or later immediately to address this vulnerability
• If immediate patching is not possible, restrict network access to the /QMSCliente/Sucesos.action endpoint using firewall rules or network segmentation
• Deploy WAF rules to filter SQL injection patterns on all endpoints handling user input
• Review database access logs for evidence of prior exploitation and assess potential data exposure

Patch Information

The vulnerability has been addressed in Quiter Gateway version 4.7.0. Organizations should upgrade to this version or later as soon as possible. For additional details and security guidance, consult the INCIBE Security Notice.

Workarounds

• Implement a Web Application Firewall (WAF) with SQL injection detection rules to filter malicious requests before they reach the application
• Restrict access to the /QMSCliente/Sucesos.action endpoint to trusted IP addresses only using network access controls
• Apply the principle of least privilege to database accounts used by the application to limit potential damage from successful exploitation
• Consider temporarily disabling the affected functionality until a patch can be applied if the endpoint is not business-critical

# Example: Block access to vulnerable endpoint using iptables (temporary workaround)
# Replace IP_RANGE with your trusted network
iptables -A INPUT -p tcp --dport 80 -m string --string "/QMSCliente/Sucesos.action" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/QMSCliente/Sucesos.action" --algo bm -j DROP
# Allow only from trusted network (adjust as needed)
iptables -I INPUT -s TRUSTED_IP_RANGE -p tcp --dport 80 -j ACCEPT
iptables -I INPUT -s TRUSTED_IP_RANGE -p tcp --dport 443 -j ACCEPT