CVE-2003-0727 in Oracle
Summary
by MITRE
Multiple buffer overflows in the XML Database (XDB) functionality for Oracle 9i Database Release 2 allow local users to cause a denial of service or hijack user sessions.
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Analysis
by VulDB Data Team • 08/10/2025
The vulnerability described in CVE-2003-0727 represents a critical security flaw within Oracle 9i Database Release 2's XML Database (XDB) component that exposes the system to potential exploitation by local attackers. This issue stems from inadequate input validation mechanisms within the XDB functionality that processes XML data, creating opportunities for buffer overflow conditions to occur when handling malformed or excessively large XML inputs. The vulnerability specifically affects the database's ability to securely process XML documents through its XDB framework, which serves as the foundation for XML data storage and retrieval operations within Oracle's database environment.
The technical implementation of this vulnerability manifests through buffer overflow conditions that occur when the XDB component processes XML data structures without proper bounds checking. Attackers can exploit these weaknesses by crafting specially formatted XML documents that exceed the allocated buffer space, causing memory corruption that results in either application crashes or more severe system instability. The flaw operates at the kernel or core database processing level where XML parsing and storage operations occur, making it particularly dangerous as it can affect the fundamental database operations and potentially allow for privilege escalation or session hijacking. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, though it may also exhibit characteristics of heap-based overflow depending on the specific implementation details of the XDB processing routines.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable more sophisticated attacks that could compromise user sessions and database integrity. Local users with access to the database system can leverage these buffer overflows to cause system instability, resulting in service interruptions that affect legitimate database operations and user access. In more severe exploitation scenarios, the memory corruption could potentially allow attackers to execute arbitrary code within the database process context, leading to session hijacking or privilege escalation. The vulnerability affects the availability and integrity of database services, as the buffer overflows can cause the database to crash or behave unpredictably during XML processing operations, which are commonly used in enterprise applications that rely on database XML capabilities.
Mitigation strategies for CVE-2003-0727 should focus on immediate patching and configuration hardening measures to prevent exploitation of the buffer overflow conditions. Oracle released security patches specifically addressing this vulnerability in subsequent database updates, and organizations should implement these patches as a priority to eliminate the risk of exploitation. Additionally, implementing strict input validation controls and limiting XML processing capabilities within the database environment can reduce the attack surface. Network segmentation and access controls should be enforced to limit local user access to database systems, while monitoring solutions should be deployed to detect unusual XML processing patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper input validation and memory management practices within database systems, aligning with ATT&CK technique T1059.007 for input validation bypass and T1499.004 for network denial of service attacks. Organizations should also consider implementing database activity monitoring and regular security assessments to identify similar vulnerabilities in legacy database systems that may be running unsupported versions of Oracle database software.