CVE-2025-40713: Quiter Gateway SQL Injection Vulnerability

CVE-2025-40713 Overview

CVE-2025-40713 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 campo parameter in the /<Client>FacturaE/BusquedasFacturasSesion endpoint. The flaw enables complete database compromise with no user interaction required.

Critical Impact

Unauthenticated attackers can fully compromise backend databases, enabling data exfiltration, modification, and destruction through the vulnerable invoice search functionality.

Affected Products

• Quiter Gateway versions prior to 4.7.0
• Quiter QuiterwEB and Autoweb products (related products mentioned in advisory)

Discovery Timeline

• 2025-07-08 - CVE-2025-40713 published to NVD
• 2025-10-15 - Last updated in NVD database

Technical Details for CVE-2025-40713

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) exists in the Quiter Gateway invoice search functionality. The application fails to properly sanitize user-supplied input in the campo parameter before incorporating it into SQL queries. Because the vulnerable endpoint appears to handle invoice and billing data searches (BusquedasFacturasSesion), successful exploitation could expose sensitive financial and business records.

The attack surface is significant because the vulnerability can be exploited remotely over the network without requiring authentication or any user interaction. An attacker with network access to the Quiter Gateway application can craft malicious SQL payloads to extract, modify, or delete arbitrary database content.

Root Cause

The root cause is improper input validation and failure to use parameterized queries or prepared statements in the /<Client>FacturaE/BusquedasFacturasSesion endpoint. The campo parameter value is directly concatenated into SQL queries without sanitization, enabling attackers to inject arbitrary SQL syntax that the database engine executes with the application's privileges.

Attack Vector

The vulnerability is exploitable via network-based attacks targeting the campo parameter. An attacker can send specially crafted HTTP requests to the vulnerable endpoint with malicious SQL payloads embedded in the parameter value. Since no authentication is required, any network-accessible instance of Quiter Gateway prior to version 4.7.0 is at risk.

Successful exploitation allows attackers to:

• Extract sensitive data from the database (customer information, invoices, financial records)
• Modify or corrupt existing database records
• Delete database tables or records, causing data loss
• Potentially escalate to operating system command execution depending on database configuration

For technical details and additional context, refer to the INCIBE CERT Security Notice.

Detection Methods for CVE-2025-40713

Indicators of Compromise

• Unusual SQL syntax patterns in HTTP request logs targeting the BusquedasFacturasSesion endpoint
• Anomalous database query patterns including UNION SELECT, OR 1=1, or database enumeration commands
• Unexpected database error messages exposed in application responses
• Evidence of data exfiltration or mass data retrieval from invoice-related tables
• Database audit logs showing unauthorized SELECT, UPDATE, INSERT, or DELETE operations

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect SQL injection patterns in the campo parameter
• Monitor HTTP access logs for requests to /<Client>FacturaE/BusquedasFacturasSesion with suspicious parameter values
• Enable database query logging and alert on queries containing injection signatures
• Implement intrusion detection rules for SQL injection attack patterns targeting Quiter Gateway

Monitoring Recommendations

• Configure real-time alerting for any requests containing SQL metacharacters in the campo parameter
• Monitor database connection logs for unusual query volumes or access patterns
• Enable application-level logging for the invoice search functionality
• Review database audit trails for unauthorized data access or modification attempts

How to Mitigate CVE-2025-40713

Immediate Actions Required

• Upgrade Quiter Gateway to version 4.7.0 or later immediately
• If immediate patching is not possible, restrict network access to the vulnerable endpoint
• Implement WAF rules to block SQL injection attempts targeting the campo parameter
• Review database logs and backups to assess if exploitation has already occurred
• Consider temporarily disabling the BusquedasFacturasSesion functionality until patched

Patch Information

Quiter has addressed this vulnerability in Quiter Gateway version 4.7.0. Organizations should upgrade to this version or later to remediate the SQL injection flaw. For additional information, consult the INCIBE CERT Security Notice.

Workarounds

• Deploy a reverse proxy or WAF with SQL injection detection rules in front of the Quiter Gateway application
• Restrict access to the vulnerable endpoint using network access controls or firewall rules
• Implement IP whitelisting to limit access to trusted networks only
• Monitor and log all requests to the affected endpoint for forensic analysis

# Example WAF/ModSecurity rule to block SQL injection attempts
SecRule ARGS:campo "@detectSQLi" \
    "id:100001,phase:2,deny,status:403,log,msg:'SQL Injection attempt blocked in Quiter Gateway campo parameter'"