CVE-2023-26022 in DB2
Summary
by MITRE • 04/28/2023
IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) is vulnerable to a denial of service as the server may crash when an Out of Memory occurs using the DBMS_OUTPUT module. IBM X-Force ID: 247868.
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Analysis
by VulDB Data Team • 05/24/2023
The vulnerability identified as CVE-2023-26022 affects IBM Db2 database management systems running on Linux, UNIX, and Windows platforms including the Db2 Connect Server component. This weakness represents a critical denial of service condition that can result in complete system unavailability when specific memory allocation scenarios occur during processing of database output operations. The issue manifests when the DBMS_OUTPUT module encounters out-of-memory conditions, causing the database server to crash and terminate unexpectedly. This represents a significant operational risk for organizations relying on Db2 for mission-critical database operations where system uptime and availability are paramount for business continuity.
The technical flaw stems from inadequate memory management within the DBMS_OUTPUT module implementation, which fails to properly handle memory allocation failures during output processing operations. When memory exhaustion occurs during database output operations, the system does not implement graceful degradation or proper error handling mechanisms to prevent complete service termination. This behavior aligns with CWE-401, which describes weakness categories related to improper handling of memory allocation failures, and demonstrates how insufficient resource management can lead to system instability. The vulnerability specifically affects the server's ability to maintain operational continuity when encountering memory pressure conditions that are common in high-load database environments where large result sets or extensive output operations may occur.
The operational impact of this vulnerability extends beyond simple service interruption to encompass potential data integrity concerns and business disruption. Database administrators and system operators may experience unexpected downtime during critical business operations, particularly when dealing with complex stored procedures or batch processing tasks that utilize the DBMS_OUTPUT module. The crash condition can result in loss of active database connections, pending transactions, and potentially require manual intervention to restore system functionality. Organizations may face significant operational costs due to unplanned maintenance windows and the need for system restarts to recover from the denial of service condition. This vulnerability also creates opportunities for attackers to exploit the system instability for further malicious activities, making it a target for both accidental and intentional disruption scenarios.
Mitigation strategies should focus on implementing comprehensive memory management practices and system monitoring capabilities to detect and respond to potential out-of-memory conditions before they escalate to system crashes. Organizations should consider implementing memory limits and resource controls on database sessions that utilize the DBMS_OUTPUT module to prevent excessive memory consumption. System administrators should establish proactive monitoring for memory pressure conditions and implement automated alerting mechanisms to detect potential vulnerability exploitation attempts. The implementation of proper error handling and graceful degradation mechanisms within database applications can help minimize the impact of memory allocation failures. Additionally, regular system updates and patches should be applied promptly to address known vulnerabilities, with particular attention to the IBM Db2 security bulletins and advisories that specifically address this CVE-2023-26022 vulnerability. Organizations should also consider implementing redundant database systems or failover mechanisms to maintain operational availability during maintenance windows or unexpected system failures. The vulnerability demonstrates the importance of robust memory management practices in database systems and highlights the need for comprehensive security testing that includes resource exhaustion scenarios as outlined in the ATT&CK framework's resource exhaustion tactics.