Source: cna@vuldb.com
A vulnerability was determined in Yonyou KSOA 9.0. The impacted element is an unknown function of the file /worksheet/del_user.jsp of the component HTTP GET Parameter Handler. Executing manipulation of the argument ID can lead to sql injection. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. 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 in the /worksheet/del_user.jsp file, allowing remote attackers to execute arbitrary SQL commands. This vulnerability, stemming from improper handling of the ID parameter, can lead to complete system compromise and data exfiltration due to the vendor's lack of response and public exploit availability.
Step 1: Payload Delivery: The attacker crafts a malicious HTTP GET request to /worksheet/del_user.jsp containing a crafted SQL injection payload within the ID parameter.
Step 2: Request Processing: The vulnerable application receives the malicious request and attempts to process it.
Step 3: Query Construction: The application constructs a SQL query using the value of the ID parameter without proper sanitization.
Step 4: SQL Injection: The malicious SQL payload injected into the ID parameter is executed by the database server.
Step 5: Data Manipulation: The attacker's injected SQL commands are executed, allowing for data retrieval, modification, or system compromise, depending on the payload and database user privileges.
The vulnerability lies within the /worksheet/del_user.jsp file in Yonyou KSOA 9.0. The root cause is the insecure handling of the ID parameter within the HTTP GET request. The application fails to properly sanitize user-supplied input before incorporating it into a SQL query. Specifically, the application likely constructs a SQL query that directly includes the value of the ID parameter without any form of input validation or escaping. This allows an attacker to inject malicious SQL code, such as adding, deleting, or modifying data within the database, or even executing arbitrary commands on the server if the database user has sufficient privileges. The lack of vendor response exacerbates the risk, as no official patches or mitigations are available.
While no specific APT groups are directly linked to this CVE, the public availability of the exploit and the severity of the vulnerability make it attractive to various threat actors, including those seeking initial access or data exfiltration. CISA KEV: Not Listed
Network Intrusion Detection Systems (NIDS) should be configured to detect SQL injection attempts. Look for suspicious patterns in HTTP GET requests to /worksheet/del_user.jsp, particularly in the ID parameter, such as SQL keywords (e.g., SELECT, UPDATE, INSERT, DELETE, UNION, OR, AND) and special characters (e.g., ', --, ;).
Web Application Firewalls (WAFs) can be deployed to filter malicious requests, blocking SQL injection attempts based on signature-based or behavior-based detection.
Review web server access logs for suspicious activity, such as unusual HTTP requests to /worksheet/del_user.jsp with potentially malicious payloads in the ID parameter. Look for long or unusual parameter values.
Monitor database server logs for suspicious SQL queries, such as those originating from the web server and containing SQL injection keywords or patterns.
Implement input validation and sanitization on the server-side. Ensure that all user-supplied input, including the ID parameter, is validated against a whitelist of acceptable characters and formats. Sanitize the input by escaping special characters that could be used in SQL injection attacks.
Use parameterized queries or prepared statements when interacting with the database. This approach separates the SQL code from the user-supplied input, preventing the injection of malicious SQL commands.
Apply the principle of least privilege to database user accounts. Grant database users only the minimum necessary permissions to perform their tasks. This limits the potential damage from a successful SQL injection attack.
Implement a Web Application Firewall (WAF) to filter malicious requests. Configure the WAF to detect and block SQL injection attempts.
Regularly update and patch the Yonyou KSOA 9.0 software when patches become available. Since the vendor has not responded, consider alternative solutions or a complete system replacement if feasible.
Conduct regular security audits and penetration testing to identify and address vulnerabilities.