Memory Leak in IBM i Operating System

Executive Summary

IBM i versions 7.6, 7.5, 7.4, and 7.3 are vulnerable to a denial of service attack due to a memory leak. A remote authenticated attacker could exploit this to cause system instability or crash by consuming excessive memory resources.

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Detection Guidance

This vulnerability is specific to IBM i systems and involves a memory leak caused by a remote authenticated attacker. Detection would typically involve monitoring system memory usage and network connections on IBM i systems. Check for unusual memory consumption patterns or unexpected network traffic from authenticated users. Use IBM i native commands like WRKACTJOB to monitor active jobs, DSPLOG to review system logs for anomalies, and NETSTAT to inspect network connections. If memory usage is abnormally high without clear cause, further investigation is warranted.

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Impact Analysis

This vulnerability could lead to system downtime, degraded performance, or complete service disruption. It may require restarting affected systems to restore normal operation, potentially causing data unavailability or loss of critical services.

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Compliance Impact

This vulnerability causes a denial of service due to a memory leak, which could disrupt system availability. Disruptions may impact data processing or access, potentially affecting compliance with standards like GDPR (data availability) or HIPAA (system reliability for protected health information).

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Mitigation Strategies

Apply the latest IBM i PTFs or updates provided by IBM to address the memory leak issue. Monitor system performance for unusual memory consumption and restrict remote authenticated access where possible.

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