CVE-2003-0095 in Oracle9i
Summary
by MITRE
Buffer overflow in ORACLE.EXE for Oracle Database Server 9i, 8i, 8.1.7, and 8.0.6 allows remote attackers to execute arbitrary code via a long username that is provided during login, as exploitable through client applications that perform their own authentication, as demonstrated using LOADPSP.
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Analysis
by VulDB Data Team • 08/25/2025
The vulnerability described in CVE-2003-0095 represents a critical buffer overflow flaw within Oracle Database Server versions 9i, 8i, 8.1.7, and 8.0.6. This security weakness resides in the ORACLE.EXE executable component of the database server architecture, specifically manifesting during the authentication process when handling user credentials. The flaw occurs when the database server receives an excessively long username parameter during login operations, creating a condition where memory boundaries are exceeded and potentially allowing malicious code execution. This vulnerability demonstrates the classic characteristics of a stack-based buffer overflow as classified by CWE-121, where insufficient bounds checking permits data to overwrite adjacent memory locations.
The technical exploitation mechanism leverages the fact that client applications performing their own authentication processes can trigger this vulnerability through the LOADPSP utility or similar mechanisms. When a remote attacker crafts a maliciously long username string and submits it during the authentication phase, the ORACLE.EXE process fails to properly validate the input length before copying it into a fixed-size buffer. This overflow condition creates a situation where attacker-controlled data can overwrite critical program memory including return addresses, function pointers, or other control structures. The vulnerability is particularly dangerous because it can be exploited remotely through network-based attacks, requiring no local system access or privileges.
The operational impact of this vulnerability extends beyond simple unauthorized code execution to encompass potential complete system compromise and data breach scenarios. Successful exploitation could allow attackers to gain elevated privileges within the database environment, potentially leading to unauthorized data access, modification, or deletion. The vulnerability affects organizations running legacy Oracle Database versions that have not been updated with security patches, creating significant exposure for enterprise environments where database security is paramount. This flaw represents a critical threat to database integrity and confidentiality, as demonstrated by the ease with which it can be exploited through standard client application interfaces.
Organizations facing this vulnerability should implement immediate mitigation strategies including applying the appropriate Oracle security patches released for this specific flaw, which aligns with the ATT&CK technique T1059.007 for Command and Scripting Interpreter. Network segmentation and firewall rules should be implemented to restrict unnecessary database access, particularly preventing direct network connectivity to database ports from untrusted networks. Input validation controls should be strengthened at application layers to prevent malformed username inputs from reaching the database server. Additionally, monitoring and logging mechanisms should be enhanced to detect unusual authentication patterns or potential exploitation attempts. The vulnerability's classification under CWE-121 and its exploitation characteristics make it a prime target for advanced persistent threat actors seeking to establish long-term access to database environments, emphasizing the critical importance of timely patch management and security controls.