CVE-2002-0571 in Oracle9i
Summary
by MITRE
Oracle Oracle9i database server 9.0.1.x allows local users to access restricted data via a SQL query using ANSI outer join syntax.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/22/2019
The vulnerability described in CVE-2002-0571 represents a significant security flaw within Oracle9i database server version 9.0.1.x that enables local users to bypass data access controls through the manipulation of SQL query syntax. This issue specifically exploits the implementation of ANSI outer join operations within the database engine, creating an unintended pathway for unauthorized data retrieval. The vulnerability exists at the query processing level where the database server fails to properly enforce access restrictions when processing certain outer join constructs, allowing maliciously crafted queries to access data that should be restricted to authorized users only.
The technical exploitation of this vulnerability stems from how Oracle9i handles ANSI outer join syntax in SQL queries, particularly when these joins involve tables with different access privileges. When a local user crafts a specific SQL query using ANSI outer join operations, the database engine's access control mechanisms become bypassed due to a flaw in the query execution path. This occurs because the outer join processing logic does not adequately validate whether the user has proper authorization to access all tables referenced in the join operation. The vulnerability is classified under CWE-284, which deals with improper access control mechanisms, and specifically relates to weak access control in database query processing. The flaw demonstrates a classic privilege escalation issue where local users can leverage legitimate database functionality to access restricted information.
The operational impact of this vulnerability extends beyond simple data exposure, as it represents a fundamental breakdown in the database server's security model. Local users who can execute SQL queries against the Oracle9i server can potentially access sensitive information that should be protected by the database's access control policies. This could include confidential financial data, personal information, or proprietary business intelligence that should only be accessible to authorized personnel. The vulnerability is particularly concerning because it affects the database server at its core query processing level, meaning that any application or user interface that relies on SQL queries for data access could be exploited. The attack vector requires local access to the database server, but once exploited, it could provide attackers with extensive data access capabilities that could compromise the entire database environment.
Mitigation strategies for CVE-2002-0571 should focus on both immediate patching and operational security enhancements. Oracle released security patches specifically addressing this vulnerability in subsequent database updates, and organizations should prioritize applying these patches to eliminate the flaw at its source. Additionally, implementing proper access control measures such as role-based access control, mandatory access control, and regular privilege reviews can help limit the potential impact of exploitation. Database administrators should also implement monitoring and logging of SQL query execution to detect anomalous query patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper input validation and access control enforcement in database systems, aligning with ATT&CK technique T1078 for valid accounts and T1566 for credential access through database exploitation. Organizations should also consider implementing database activity monitoring tools that can detect and alert on suspicious outer join operations that may attempt to bypass access controls, as this represents a specific attack pattern that can be monitored and prevented through proper security operations.