CVE-2009-4329 in DB2
Summary
by MITRE
Unspecified vulnerability in the Engine Utilities component in IBM DB2 9.5 before FP5 allows remote authenticated users to cause a denial of service (segmentation fault) by modifying the db2ra data stream sent in a request from the Load Utility.
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Analysis
by VulDB Data Team • 08/28/2021
The vulnerability identified as CVE-2009-4329 represents a critical weakness within IBM DB2 9.5 prior to Fix Pack 5, specifically affecting the Engine Utilities component. This issue manifests as a remote authenticated denial of service condition that can be exploited through manipulation of the db2ra data stream during Load Utility operations. The flaw exists in the processing of data streams received from client applications, creating an opportunity for attackers to disrupt database operations through carefully crafted input sequences. The vulnerability specifically targets the database engine's ability to handle incoming requests from authorized users who possess valid credentials and access privileges.
The technical implementation of this vulnerability stems from insufficient input validation within the Engine Utilities processing layer of DB2 9.5. When the Load Utility receives data streams containing malformed or unexpected data patterns from the db2ra component, the system fails to properly sanitize or validate these inputs before processing. This leads to a segmentation fault condition that causes the database engine to crash and terminate unexpectedly. The flaw operates at the application level where the database engine's internal state management becomes corrupted due to improper handling of the modified data stream, resulting in memory access violations that cannot be recovered from gracefully. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, though the specific manifestation involves memory corruption through data stream manipulation rather than traditional buffer overflow techniques.
From an operational perspective, this vulnerability presents significant risk to database availability and system stability in environments where DB2 9.5 is deployed without the necessary security patches. Remote authenticated attackers who can establish valid database connections and execute Load Utility operations can exploit this weakness to systematically disrupt database services, potentially causing extended downtime and data availability issues. The impact extends beyond simple service disruption as database administrators may face challenges in maintaining consistent service levels and could experience increased recovery times when systems become unavailable due to the segmentation fault conditions. Organizations utilizing this database version without proper patch management protocols face heightened exposure to coordinated denial of service attacks that could target multiple database instances simultaneously.
The exploitation of this vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks targeting database systems. Security professionals should implement immediate mitigations including deployment of IBM's Fix Pack 5 or later versions that address this specific flaw in the Engine Utilities component. Additionally, organizations should consider implementing network segmentation controls to limit access to database services and establish monitoring protocols that can detect anomalous data stream patterns indicative of exploitation attempts. Database administrators should also review and restrict permissions for Load Utility operations to minimize the attack surface and ensure that only authorized personnel can initiate potentially vulnerable operations. The vulnerability demonstrates the importance of maintaining current security patches and implementing robust access controls as part of comprehensive database security strategies.