CVE-2025-3708: Le-show Le-yan SQLi Vulnerability

CVE-2025-3708 Overview

Le-show Le-yan medical practice management system contains a critical SQL Injection vulnerability that allows unauthenticated remote attackers to inject arbitrary SQL commands. Successful exploitation enables attackers to read, modify, and delete database contents, potentially compromising sensitive patient medical records and practice management data.

Critical Impact

This vulnerability allows unauthenticated attackers to fully compromise the database of medical practice management systems, potentially exposing protected health information (PHI) and enabling complete data manipulation or destruction.

Affected Products

• Le-show Le-yan Medical Practice Management System (all versions)

Discovery Timeline

• 2025-05-02 - CVE-2025-3708 published to NVD
• 2025-05-07 - Last updated in NVD database

Technical Details for CVE-2025-3708

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) in the Le-show Le-yan medical practice management system allows remote attackers to manipulate SQL queries without requiring authentication. The vulnerability exists due to improper neutralization of special elements used in SQL commands, enabling attackers to inject malicious SQL statements that are executed by the underlying database.

Healthcare systems like Le-yan typically store highly sensitive information including patient records, medical histories, billing information, and administrative credentials. The ability to read, modify, and delete this data without authentication represents a severe security risk for medical practices using this system.

Root Cause

The vulnerability stems from insufficient input validation and improper sanitization of user-supplied data before it is incorporated into SQL queries. The application fails to properly parameterize database queries, allowing user input to be directly concatenated into SQL statements. This classic SQL Injection flaw enables attackers to break out of the intended query context and execute arbitrary database commands.

Attack Vector

The attack can be executed remotely over the network without requiring any authentication or user interaction. An attacker can craft malicious HTTP requests containing SQL injection payloads targeting vulnerable input fields or parameters within the Le-yan application. The injected SQL commands are then executed with the privileges of the database user configured for the application, potentially granting full access to read sensitive data, modify records, or delete entire tables.

Since no authentication is required, any attacker with network access to the system can exploit this vulnerability. For internet-facing deployments, this means the attack surface extends globally.

Detection Methods for CVE-2025-3708

Indicators of Compromise

• Unusual database queries containing SQL syntax characters such as single quotes ('), double dashes (--), semicolons (;), or UNION SELECT statements in application logs
• Unexpected database access patterns including bulk data extraction or modification operations
• Authentication bypass attempts or access to records outside normal user permissions
• Database error messages appearing in web server logs indicating malformed queries
• Abnormal network traffic patterns to the Le-yan application server from unfamiliar IP addresses

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns targeting the Le-yan application
• Enable detailed logging on the database server to capture all query executions and identify anomalous SQL statements
• Implement network intrusion detection systems (IDS) with signatures for SQL injection attack patterns
• Monitor application logs for error messages indicating SQL syntax errors or database exceptions
• Configure alerting for failed authentication attempts and unusual data access patterns

Monitoring Recommendations

• Continuously monitor database query logs for suspicious patterns including UNION, SELECT, INSERT, UPDATE, DELETE, and DROP statements from unexpected sources
• Set up real-time alerts for any database schema modifications or bulk data operations
• Track network connections to the Le-yan application and database servers for connections from unauthorized IP ranges
• Review access logs regularly for evidence of automated scanning or exploitation attempts

How to Mitigate CVE-2025-3708

Immediate Actions Required

• Restrict network access to the Le-yan medical practice management system to trusted IP addresses only
• Place the application behind a properly configured Web Application Firewall (WAF) with SQL injection protection enabled
• If possible, take the system offline until patches are available if it contains sensitive patient data
• Implement additional network segmentation to isolate the database server from direct external access
• Review database logs for evidence of prior exploitation and assess data integrity

Patch Information

At the time of publication, specific patch information from Le-show was not available in the advisory. Organizations using the Le-yan medical practice management system should contact the vendor directly for remediation guidance. Monitor the TWCERT Security Advisory for updates on available patches.

Workarounds

• Implement strict input validation at the application perimeter using a WAF to filter malicious SQL injection payloads
• Configure database user accounts with least-privilege principles, limiting the application's database permissions to only required operations
• Enable prepared statements or parameterized queries if application code modifications are possible
• Deploy database activity monitoring to detect and alert on unauthorized query patterns
• Consider network isolation to restrict access to the application from untrusted networks until a vendor patch is available

# Example WAF rule to block common SQL injection patterns (ModSecurity format)
SecRule ARGS "@detectSQLi" "id:1001,phase:2,deny,status:403,log,msg:'SQL Injection Attempt Detected'"

# Restrict database user privileges (MySQL example)
REVOKE ALL PRIVILEGES ON leyan_db.* FROM 'leyan_app'@'localhost';
GRANT SELECT, INSERT, UPDATE ON leyan_db.patients TO 'leyan_app'@'localhost';
GRANT SELECT, INSERT, UPDATE ON leyan_db.appointments TO 'leyan_app'@'localhost';