CVE-2025-15434: Yonyou Ksoa SQL Injection Vulnerability

CVE-2025-15434 Overview

A SQL injection vulnerability has been identified in Yonyou KSOA version 9.0, specifically affecting the /kp/PrintZPYG.jsp file. The vulnerability exists due to improper input validation of the zpjhid parameter, which allows remote attackers to manipulate database queries through crafted SQL injection payloads. This vulnerability can be exploited remotely without authentication, potentially allowing attackers to read, modify, or delete sensitive data stored in the backend database.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to bypass security controls, extract sensitive data, modify database contents, or potentially escalate to further system compromise through database-level attacks.

Affected Products

• Yonyou KSOA 9.0

Discovery Timeline

• 2026-01-02 - CVE-2025-15434 published to NVD
• 2026-01-07 - Last updated in NVD database

Technical Details for CVE-2025-15434

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), specifically manifesting as SQL injection. The affected endpoint /kp/PrintZPYG.jsp fails to properly sanitize user-supplied input in the zpjhid parameter before incorporating it into SQL queries. This lack of input validation allows attackers to inject arbitrary SQL syntax that gets executed by the database engine.

The vulnerability is remotely exploitable without requiring authentication or user interaction. An attacker can craft malicious HTTP requests containing SQL injection payloads in the zpjhid parameter to manipulate the underlying database queries. Successful exploitation can lead to unauthorized data disclosure, data manipulation, and depending on database configuration, potentially command execution on the underlying system.

The vendor was contacted early about this disclosure but did not respond, leaving users without an official patch or acknowledgment of the issue. The exploit details have been made public, increasing the risk of active exploitation.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and parameterized query usage in the /kp/PrintZPYG.jsp file. The application directly concatenates user-supplied input from the zpjhid parameter into SQL queries without sanitization or use of prepared statements. This allows attackers to break out of the intended query context and inject malicious SQL commands.

Attack Vector

The attack vector is network-based, requiring no special privileges or user interaction. An attacker can exploit this vulnerability by sending crafted HTTP requests to the vulnerable JSP endpoint with malicious SQL payloads in the zpjhid parameter.

The exploitation flow involves:

1. Attacker identifies the vulnerable endpoint /kp/PrintZPYG.jsp
2. Attacker crafts a malicious request with SQL injection payload in the zpjhid parameter
3. The server processes the request without proper sanitization
4. The injected SQL is executed against the backend database
5. Attacker receives the results or achieves the intended malicious outcome

Technical details and proof-of-concept information are available in the GitHub CVE Issue Discussion and VulDB entry #339361.

Detection Methods for CVE-2025-15434

Indicators of Compromise

• HTTP requests to /kp/PrintZPYG.jsp containing SQL syntax characters such as single quotes, double dashes, UNION statements, or semicolons in the zpjhid parameter
• Database error messages in application logs indicating SQL syntax errors or unexpected query behavior
• Unusual database query patterns or execution times originating from web application requests
• Evidence of data exfiltration or unauthorized database modifications

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in requests to /kp/PrintZPYG.jsp
• Implement database activity monitoring to detect anomalous queries or unauthorized data access patterns
• Configure intrusion detection systems (IDS) to alert on SQL injection attack signatures targeting the affected endpoint
• Review web server access logs for suspicious requests containing injection payloads

Monitoring Recommendations

• Enable detailed logging for the Yonyou KSOA application, particularly for database interactions and the affected JSP endpoint
• Set up alerts for database query errors or exceptions that may indicate injection attempts
• Monitor network traffic for unusual outbound data transfers that could indicate successful data exfiltration
• Implement real-time log analysis to correlate web requests with database activity

How to Mitigate CVE-2025-15434

Immediate Actions Required

• Restrict network access to the /kp/PrintZPYG.jsp endpoint to trusted IP addresses only
• Implement WAF rules to filter and block SQL injection payloads targeting the vulnerable parameter
• Consider temporarily disabling the affected functionality if not business-critical until a proper fix is available
• Apply the principle of least privilege to database accounts used by the application

Patch Information

At the time of this publication, the vendor (Yonyou) has not released an official patch for this vulnerability. The vendor was contacted about this disclosure but did not respond. Organizations using Yonyou KSOA 9.0 should monitor for vendor updates and apply patches as soon as they become available. Additional information can be found in the VulDB entry.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL injection detection rules in front of the Yonyou KSOA application
• Implement network segmentation to limit access to the affected application from untrusted networks
• Apply input validation at the network perimeter using reverse proxy rules to filter malicious characters from the zpjhid parameter
• If source code access is available, implement parameterized queries or prepared statements for all database interactions in PrintZPYG.jsp

# Example WAF rule configuration (ModSecurity)
# Block SQL injection attempts targeting the vulnerable parameter
SecRule ARGS:zpjhid "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    msg:'SQL Injection attempt detected in zpjhid parameter',\
    log,\
    auditlog"