CVE-2002-1631

Step 1: Payload Delivery: The attacker crafts a malicious SQL query and embeds it within the sql parameter of a HTTP GET or POST request to the query.xsql page. Step 2: Request Submission: The attacker submits the crafted request to the vulnerable Oracle 9iAS server. Step 3: Query Construction: The query.xsql page receives the request and, without proper sanitization, incorporates the attacker-supplied sql parameter directly into a dynamically constructed SQL query. Step 4: Query Execution: The vulnerable SQL query, now containing the attacker's malicious SQL code, is executed by the Oracle database server. Step 5: Code Execution/Data Exfiltration: The attacker's malicious SQL code is executed, potentially leading to unauthorized data access, modification, or even remote code execution depending on the database configuration and the injected SQL payload.

The vulnerability stems from insufficient input validation and sanitization of the sql parameter within the query.xsql page. This page likely constructs SQL queries dynamically based on user-supplied input without properly escaping or filtering special characters. This allows an attacker to inject malicious SQL code, such as commands to read sensitive data, modify database contents, or even execute operating system commands if the database server is configured to allow it. The root cause is a failure to implement parameterized queries or other secure coding practices to prevent the interpretation of user-supplied input as executable code. Specifically, the lack of input validation and output encoding allows for the injection of malicious SQL statements.