CVE-2009-2858 in DB2
Summary
by MITRE
Memory leak in the Security component in IBM DB2 8.1 before FP18 on Unix platforms allows attackers to cause a denial of service (memory consumption) via unspecified vectors, related to private memory within the DB2 memory structure.
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Analysis
by VulDB Data Team • 08/20/2021
The vulnerability identified as CVE-2009-2858 represents a critical memory management flaw within IBM DB2 Database Server version 8.1 prior to Fix Pack 18 on Unix operating systems. This issue specifically targets the Security component of the database system, where improper handling of private memory structures leads to uncontrolled memory consumption over time. The vulnerability operates through unspecified attack vectors that exploit the way DB2 manages memory allocation during security-related operations, ultimately resulting in a denial of service condition that can severely impact database availability and system performance.
The technical nature of this vulnerability stems from a memory leak condition within the DB2 security subsystem where allocated memory blocks are not properly released back to the system after use. This private memory within the DB2 memory structure becomes progressively consumed as the database processes security operations, leading to gradual memory exhaustion. The flaw manifests when the security component fails to correctly manage memory deallocation routines, causing memory segments to remain allocated even after their intended use has concluded. This behavior aligns with CWE-401, which categorizes memory leaks as a fundamental weakness in memory management practices, and represents a classic example of resource exhaustion attacks that can be exploited to cause system instability.
The operational impact of this vulnerability extends beyond simple resource consumption, as it creates a persistent degradation of system performance that can ultimately lead to complete service unavailability. Attackers can leverage this vulnerability through various means that trigger security component operations, causing sustained memory consumption that may require system restarts to resolve. The cumulative effect of memory leakage can result in system slowdowns, application timeouts, and complete database service interruptions, particularly in environments where DB2 is under heavy security processing loads. This vulnerability directly impacts the availability aspect of the CIA triad and can be classified under the ATT&CK technique T1499.100, which addresses resource exhaustion attacks targeting system services.
Mitigation strategies for CVE-2009-2858 primarily focus on applying the official IBM fix pack 18 for DB2 8.1, which addresses the specific memory management issues within the security component. Organizations should also implement monitoring solutions to track memory consumption patterns and establish automated alerting for unusual memory usage spikes that may indicate exploitation attempts. System administrators should consider implementing memory limits and resource controls to prevent complete system exhaustion, while also maintaining regular backup and recovery procedures to quickly restore services if attacks occur. The vulnerability demonstrates the importance of timely patch management and proper memory management practices in enterprise database systems, highlighting how seemingly minor memory handling flaws can have significant operational consequences that affect business continuity and system reliability.