CVE-2025-40621: Tcman GIM SQL Injection Vulnerability

CVE-2025-40621 Overview

CVE-2025-40621 is a critical SQL Injection vulnerability affecting TCMAN's GIM version 11. This vulnerability allows an unauthenticated attacker to inject malicious SQL statements through the User parameter of the ValidateUserAndGetData endpoint. Successful exploitation enables attackers to obtain, update, and delete all information stored in the database, potentially leading to complete compromise of the application's data integrity and confidentiality.

Critical Impact

Unauthenticated attackers can fully compromise the database through SQL injection, enabling data theft, modification, and deletion without any authentication requirements.

Affected Products

• TCMAN GIM v11.0
• TCMAN GIM v11 (all builds)

Discovery Timeline

• 2025-05-06 - CVE-2025-40621 published to NVD
• 2025-05-13 - Last updated in NVD database

Technical Details for CVE-2025-40621

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) exists in the ValidateUserAndGetData endpoint of TCMAN GIM v11. The application fails to properly sanitize user-supplied input in the User parameter before incorporating it into SQL queries. Because the endpoint handles authentication validation, it is accessible without prior authentication, making this vulnerability particularly severe.

The network-accessible nature of this vulnerability means attackers can remotely exploit it without requiring any user interaction or prior access to the system. The impact extends across all three security pillars: confidentiality is compromised through unauthorized data access, integrity is affected through the ability to modify records, and availability can be impacted through data deletion operations.

Root Cause

The root cause of CVE-2025-40621 is improper input validation and lack of parameterized queries in the ValidateUserAndGetData endpoint. The User parameter is directly concatenated into SQL statements without proper sanitization or the use of prepared statements. This classic SQL injection pattern allows attackers to break out of the intended query structure and execute arbitrary SQL commands against the underlying database.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests to the ValidateUserAndGetData endpoint, injecting SQL payloads through the User parameter. The injection point in an authentication-related endpoint makes this especially dangerous, as it may allow attackers to bypass authentication entirely while also gaining direct database access.

The vulnerability can be exploited through standard SQL injection techniques including UNION-based attacks for data extraction, boolean-based blind injection, and time-based blind injection methods. Since the endpoint processes user authentication data, attackers can leverage the injection to extract user credentials, session tokens, and other sensitive information stored in the database.

Detection Methods for CVE-2025-40621

Indicators of Compromise

• Unusual SQL syntax patterns in web server logs targeting the ValidateUserAndGetData endpoint
• Multiple failed or unusual authentication attempts with SQL metacharacters in usernames
• Database query logs showing unexpected UNION SELECT, DROP, UPDATE, or DELETE operations
• Anomalous data access patterns or bulk data extraction from the database

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in the User parameter
• Monitor web server access logs for requests to ValidateUserAndGetData containing SQL keywords or special characters
• Enable database audit logging to detect unauthorized query patterns
• Deploy intrusion detection systems with signatures for common SQL injection payloads

Monitoring Recommendations

• Continuously monitor the ValidateUserAndGetData endpoint for anomalous request patterns
• Set up alerts for database errors that may indicate injection attempts
• Review authentication logs for patterns indicating credential harvesting attempts
• Implement real-time monitoring of database queries for suspicious SQL operations

How to Mitigate CVE-2025-40621

Immediate Actions Required

• Restrict network access to the affected TCMAN GIM v11 installation using firewall rules
• Implement WAF rules to block SQL injection attempts targeting the ValidateUserAndGetData endpoint
• Review database logs for evidence of prior exploitation
• Consider taking the affected application offline until a patch is available or mitigations are in place

Patch Information

Organizations should consult the INCIBE CERT advisory on multiple vulnerabilities in TCMAN's GIM for official vendor guidance and patch availability. Contact TCMAN directly for the latest security updates addressing this vulnerability.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL injection detection capabilities in front of the application
• Implement network segmentation to limit access to the TCMAN GIM application to trusted networks only
• Use IP allowlisting to restrict access to the ValidateUserAndGetData endpoint
• Monitor and log all access attempts to the vulnerable endpoint for forensic purposes

# Example WAF rule for ModSecurity to block SQL injection attempts
SecRule ARGS:User "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    msg:'SQL Injection attempt detected in User parameter',\
    log,\
    auditlog"