CVE-2025-40620: Tcman Gim SQLi Vulnerability

CVE-2025-40620 Overview

CVE-2025-40620 is a critical SQL injection vulnerability discovered in TCMAN's GIM (Gestión Integral de Mantenimiento) version 11. This vulnerability allows an unauthenticated attacker to inject malicious SQL statements through the User parameter of the ValidateUserAndWS endpoint, enabling them to obtain, update, and delete all information in the database.

Critical Impact

Unauthenticated attackers can fully compromise database integrity and confidentiality, potentially accessing, modifying, or destroying all stored data without any authentication requirements.

Affected Products

• TCMAN GIM version 11.0
• TCMAN GIM v11 deployments utilizing the ValidateUserAndWS endpoint

Discovery Timeline

• 2025-05-06 - CVE-2025-40620 published to NVD
• 2025-05-13 - Last updated in NVD database

Technical Details for CVE-2025-40620

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) affects TCMAN's GIM v11 enterprise maintenance management system. The flaw resides in the ValidateUserAndWS endpoint, which fails to properly sanitize user-supplied input in the User parameter before incorporating it into SQL queries. Because no authentication is required to reach this endpoint, the attack surface is significantly expanded, allowing any remote attacker with network access to exploit the vulnerability.

The vulnerability enables complete database compromise through standard SQL injection techniques. Attackers can extract sensitive information, modify existing records, or delete entire tables. Given the nature of GIM as a maintenance management system, compromised data could include operational schedules, asset inventories, personnel information, and business-critical maintenance records.

Root Cause

The root cause is improper input validation and sanitization in the ValidateUserAndWS endpoint. The User parameter is directly concatenated or interpolated into SQL queries without proper parameterization or escaping. This classic SQL injection pattern allows attacker-controlled input to break out of the intended query context and execute arbitrary SQL commands.

Attack Vector

The attack vector is network-based and requires no authentication. An attacker can craft malicious HTTP requests to the ValidateUserAndWS endpoint, embedding SQL payloads in the User parameter. Since this is an authentication-related endpoint, it is inherently exposed to unauthenticated users, making exploitation trivial once the vulnerability is discovered.

The exploitation flow involves:

1. Identifying the vulnerable ValidateUserAndWS endpoint on a target GIM v11 installation
2. Crafting SQL injection payloads in the User parameter
3. Extracting database schema information through UNION-based or error-based injection
4. Leveraging the access to read, modify, or delete database contents

For detailed technical information, refer to the INCIBE Security Notice.

Detection Methods for CVE-2025-40620

Indicators of Compromise

• Unusual or malformed requests to the ValidateUserAndWS endpoint containing SQL syntax characters such as single quotes, semicolons, or SQL keywords
• Database logs showing unexpected queries or errors originating from the GIM application
• Evidence of data exfiltration or unauthorized bulk data access patterns in database audit logs

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block SQL injection patterns in requests to the ValidateUserAndWS endpoint
• Enable detailed logging on the GIM application and configure alerts for requests containing SQL metacharacters in the User parameter
• Monitor database query logs for anomalous queries that do not match expected application behavior

Monitoring Recommendations

• Implement real-time alerting for failed authentication attempts that contain suspicious characters or SQL keywords
• Configure database activity monitoring to track queries executed against sensitive tables
• Review web server access logs periodically for reconnaissance patterns targeting the ValidateUserAndWS endpoint

How to Mitigate CVE-2025-40620

Immediate Actions Required

• Restrict network access to the vulnerable GIM v11 application to trusted IP ranges only
• Place a web application firewall in front of the GIM installation with SQL injection detection rules enabled
• Review database access logs for signs of prior exploitation and assess potential data compromise
• Contact TCMAN for official patch availability and guidance

Patch Information

Organizations running TCMAN GIM v11 should consult the INCIBE Security Notice for official remediation guidance and patch information from the vendor. Apply any available security updates as soon as they become available.

Workarounds

• Implement network segmentation to limit access to the GIM application from untrusted networks
• Deploy a reverse proxy with input validation rules to filter malicious SQL injection payloads before they reach the application
• If the ValidateUserAndWS endpoint is not required for business operations, consider disabling it temporarily until a patch is applied