CVE-2025-15425: Yonyou KSOA 9.0 SQL Injection Vulnerability

CVE-2025-15425 Overview

A SQL injection vulnerability has been identified in Yonyou KSOA 9.0, a widely-deployed enterprise information integration platform. The vulnerability exists in the /worksheet/del_user.jsp file within the HTTP GET Parameter Handler component. By manipulating the ID argument, an attacker can inject malicious SQL commands that are executed by the backend database. This vulnerability can be exploited remotely without authentication, posing a significant risk to organizations using this platform.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to read, modify, or delete sensitive data from backend databases, potentially leading to complete compromise of enterprise information systems.

Affected Products

• Yonyou KSOA 9.0
• Yonyou Space-Time Enterprise Information Integration KSOA Platform

Discovery Timeline

• 2026-01-02 - CVE-2025-15425 published to NVD
• 2026-01-05 - Last updated in NVD database

Technical Details for CVE-2025-15425

Vulnerability Analysis

This SQL injection vulnerability (classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) affects the del_user.jsp endpoint in the Yonyou KSOA 9.0 platform. The vulnerability occurs when user-supplied input via the ID parameter is incorporated directly into SQL queries without proper sanitization or parameterization.

When a request is made to the /worksheet/del_user.jsp endpoint, the application fails to validate or sanitize the ID parameter before constructing database queries. This allows attackers to inject arbitrary SQL commands that are then executed with the privileges of the database user configured for the application. The exploit has been publicly disclosed, and the vendor was contacted about this issue but did not respond.

Root Cause

The root cause of this vulnerability is improper input validation and lack of parameterized queries in the del_user.jsp file. The application directly concatenates user-supplied input from the ID HTTP GET parameter into SQL statements, enabling injection attacks. The absence of prepared statements, stored procedures, or input sanitization allows malicious SQL code to be interpreted and executed by the database engine.

Attack Vector

The attack can be executed remotely over the network without requiring authentication. An attacker crafts a malicious HTTP GET request to the vulnerable endpoint (/worksheet/del_user.jsp) with a specially crafted ID parameter containing SQL injection payloads. The attack requires no special privileges or user interaction, making it particularly dangerous for internet-exposed instances.

The exploitation technique involves injecting SQL syntax through the ID parameter to manipulate query logic. Depending on the database backend and application configuration, attackers may be able to extract sensitive data using UNION-based or blind SQL injection techniques, modify or delete records, or potentially escalate to command execution through database-specific features. Technical details and proof-of-concept information are available in the GitHub SQL Injection Report.

Detection Methods for CVE-2025-15425

Indicators of Compromise

• HTTP GET requests to /worksheet/del_user.jsp containing SQL keywords such as UNION, SELECT, INSERT, UPDATE, DELETE, or comment characters (--, /**/) in the ID parameter
• Unusual database query patterns or errors in application logs indicating malformed SQL statements
• Unexpected data exfiltration or modifications in database audit logs
• Web application firewall (WAF) alerts for SQL injection attempts targeting the KSOA platform

Detection Strategies

• Deploy web application firewall rules to detect and block SQL injection patterns in requests to /worksheet/del_user.jsp
• Implement database activity monitoring to identify anomalous queries or unauthorized data access from the KSOA application database user
• Enable verbose logging on the web server and application to capture requests containing suspicious characters in the ID parameter
• Use intrusion detection systems (IDS) with signatures for common SQL injection attack patterns

Monitoring Recommendations

• Monitor access logs for repeated requests to /worksheet/del_user.jsp with varying ID parameter values, which may indicate automated exploitation attempts
• Set up alerts for database errors that may indicate SQL injection probing activity
• Review authentication and authorization logs for any signs of privilege escalation following exploitation

How to Mitigate CVE-2025-15425

Immediate Actions Required

• If not required for business operations, immediately disable or restrict access to the /worksheet/del_user.jsp endpoint
• Implement network-level access controls to limit access to the Yonyou KSOA platform to trusted IP addresses only
• Deploy a web application firewall (WAF) with SQL injection protection rules in front of the KSOA application
• Review database permissions to ensure the application uses a least-privilege account

Patch Information

At the time of publication, the vendor (Yonyou) has not responded to disclosure attempts and no official patch is available. Organizations should implement the workarounds listed below and monitor for vendor updates. Additional vulnerability details are available at VulDB #339347.

Workarounds

• Restrict network access to the KSOA platform using firewall rules, limiting connectivity to only trusted internal networks
• Implement input validation at the application level using a reverse proxy or WAF to filter malicious characters from the ID parameter
• Consider taking the affected endpoint offline if the functionality is not critical to business operations
• Segment the database server from other network resources to limit the impact of potential exploitation

# Example WAF rule to block SQL injection attempts (ModSecurity)
SecRule ARGS:ID "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in ID parameter',\
    tag:'attack-sqli'"