CVE-2009-0173 in DB2 Universal Database
Summary
by MITRE
Unspecified vulnerability in the server in IBM DB2 8 before FP17a, 9.1 before FP6a, and 9.5 before FP3a allows remote authenticated users to cause a denial of service (trap) via a crafted data stream.
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Analysis
by VulDB Data Team • 05/17/2025
The vulnerability identified as CVE-2009-0173 represents a critical denial of service flaw affecting IBM DB2 database server implementations across multiple version lines including DB2 8 before FP17a, 9.1 before FP6a, and 9.5 before FP3a. This unspecified weakness in the server component creates a potential trap condition that can be exploited by remote authenticated users to disrupt database operations. The vulnerability manifests through crafted data streams that, when processed by the affected DB2 server, trigger system instability leading to service disruption. Such flaws in database infrastructure are particularly concerning as they can impact enterprise data availability and business continuity operations. The trap condition suggests that the server enters an unexpected state where normal processing ceases, requiring system intervention to restore functionality.
The technical nature of this vulnerability aligns with CWE-121, which describes buffer overflow conditions that can lead to system instability and denial of service scenarios. The flaw operates at the server level where incoming data streams are processed, indicating a potential issue in input validation or data handling mechanisms within the DB2 server architecture. Attackers with authenticated access can leverage this vulnerability to send maliciously constructed data packets that cause the database server to enter a trap state, effectively rendering it unavailable to legitimate users. The authenticated requirement suggests that the attack vector involves a user with valid credentials who can establish a connection to the database server before executing the malicious payload.
Operational impact assessment reveals that this vulnerability poses significant risk to enterprise database environments where DB2 serves as a critical data management platform. Organizations running affected versions may experience unplanned service interruptions, potentially affecting multiple business applications that depend on database availability. The trap condition could result in complete database server shutdown requiring manual intervention and system restarts, leading to extended downtime and potential data access issues. This vulnerability particularly affects environments where database servers handle high volumes of transactions and where availability is critical for business operations. The remote nature of the attack means that threat actors can exploit this flaw from external network positions without requiring physical access to the database infrastructure.
Mitigation strategies should prioritize immediate deployment of vendor-provided security patches and fix packs for the affected DB2 versions. Organizations should implement network segmentation and access controls to limit authenticated user access to database servers where possible. Monitoring systems should be enhanced to detect unusual patterns in database server behavior that might indicate exploitation attempts. The implementation of input validation controls and data stream filtering mechanisms can help reduce the attack surface. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar issues within the database infrastructure. Compliance with industry standards such as those outlined in the NIST Cybersecurity Framework and ISO 27001 should be maintained during remediation efforts to ensure comprehensive security posture improvement. Organizations should also consider implementing database activity monitoring solutions to detect and respond to anomalous database access patterns that could indicate exploitation attempts.