Yonyou KSOA SQL Injection Vulnerability in Version 9.0

A SQL injection vulnerability has been identified in Yonyou KSOA Platform version 9.0. The issue resides in the '/worksheet/del_user.jsp' file, where the application improperly handles the 'id' parameter in HTTP GET requests. This lack of validation allows unauthenticated remote attackers to inject malicious SQL commands, potentially leading to unauthorized database access, data leakage, or manipulation of the database server. The vulnerability affects environments using Microsoft SQL Server.

Impact

Exploitation of this vulnerability allows for unauthorized access to the database, leakage of sensitive data, tampering with data, and possibly gaining administrative control over the database server.

Reproduction

The vulnerability can be reproduced by sending a GET request to 'http://<target>:<port>/worksheet/del_user.jsp' with the 'id' parameter manipulated to include SQL injection payloads. This can be automated using tools like sqlmap, targeting the Microsoft SQL Server database management system.

Remediation

It is recommended to use prepared statements for database queries to prevent SQL injection, validate input parameters to ensure they meet expected formats, deploy a Web Application Firewall (WAF) to block SQL injection attempts, and disable detailed database error messages on the frontend.