Source: cna@vuldb.com
A vulnerability was detected in Yonyou KSOA 9.0. Affected is an unknown function of the file /kp/PrintZPYG.jsp. The manipulation of the argument zpjhid results in sql injection. It is possible to launch the attack remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Yonyou KSOA 9.0 is vulnerable to a critical SQL injection flaw, allowing attackers to remotely execute arbitrary database commands. This vulnerability, located in the /kp/PrintZPYG.jsp file, stems from improper sanitization of the zpjhid parameter, potentially leading to data breaches and complete system compromise. The vendor has failed to address this issue, and a public exploit is available, making this a high-priority threat.
Step 1: Payload Delivery: The attacker crafts a malicious HTTP request targeting /kp/PrintZPYG.jsp. The request includes a crafted zpjhid parameter containing a SQL injection payload.
Step 2: Request Processing: The web server receives the malicious request and passes it to the PrintZPYG.jsp script.
Step 3: Query Construction: The PrintZPYG.jsp script constructs a SQL query using the value of the zpjhid parameter. Because the input is not sanitized, the attacker's injected SQL code is incorporated into the query.
Step 4: Database Execution: The crafted SQL query, now containing the attacker's payload, is executed against the database.
Step 5: Data Exfiltration/Manipulation: The attacker's injected SQL code executes, allowing them to potentially read sensitive data, modify existing data, or even gain control of the database server, depending on the privileges of the database user used by the application.
The vulnerability lies within the /kp/PrintZPYG.jsp file in Yonyou KSOA 9.0. The zpjhid parameter, likely used to retrieve data from a database, is not properly sanitized before being used in a SQL query. This allows an attacker to inject malicious SQL code, modifying the query's behavior. The root cause is a lack of input validation and parameterized queries. The application directly concatenates user-supplied input into a SQL statement without escaping special characters or using prepared statements. This allows an attacker to craft a payload that alters the intended query, potentially leading to unauthorized data access, modification, or even remote code execution if the database user has sufficient privileges. The absence of any form of input validation or sanitization is the core of the problem.
While no specific APT groups are directly linked to this CVE, the ease of exploitation and the potential for significant impact make it attractive to various threat actors. This vulnerability could be leveraged by ransomware groups or for data exfiltration. The lack of vendor response suggests a high likelihood of continued exploitation. CISA KEV status: Not Listed (as of this analysis, but should be monitored).
Network Intrusion Detection Systems (NIDS) should be configured to detect SQL injection attempts. Look for suspicious patterns in HTTP requests, such as the use of SQL keywords (e.g., SELECT, INSERT, UPDATE, DELETE, UNION) within the zpjhid parameter of requests to /kp/PrintZPYG.jsp.
Web Application Firewalls (WAFs) should be deployed and configured to block SQL injection attacks. WAF rules should be specifically tailored to detect and block malicious payloads targeting the vulnerable endpoint.
Review web server logs for unusual activity, such as a high volume of requests to /kp/PrintZPYG.jsp or requests containing suspicious characters in the zpjhid parameter.
Monitor database server logs for unusual queries or activity that could indicate SQL injection attempts. Look for queries that include unexpected SQL keywords or that access sensitive tables.
Implement input validation and sanitization on the zpjhid parameter. Ensure that all user-supplied input is validated against a whitelist of acceptable characters and formats. Sanitize any special characters that could be used in SQL injection attacks.
Use parameterized queries or prepared statements. This is the most effective way to prevent SQL injection attacks. Parameterized queries separate the SQL code from the user-supplied input, preventing attackers from injecting malicious code.
Apply the latest security patches from the vendor when available. Although the vendor has not responded, monitor for any potential patches or workarounds.
Implement the principle of least privilege for the database user used by the application. The database user should only have the minimum necessary permissions to perform its required tasks. This limits the potential impact of a successful SQL injection attack.
Conduct regular vulnerability scans to identify and address security vulnerabilities in the application and its environment.
Consider deploying a Web Application Firewall (WAF) to filter malicious traffic and protect against SQL injection attacks.