Denial of Service in IBM i Due to Improper Access Control

Executive Summary

This vulnerability in IBM i 7.3, 7.4, 7.5, and 7.6 allows a local attacker to cause a denial of service due to improper access control. This means an attacker could exploit weaknesses in how the system manages user permissions to disrupt normal operations.

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Detection Guidance

Detection of this vulnerability requires checking for improper access control in IBM i systems. Monitor for unusual system service tool access attempts or error code patterns during sign-on processes. Review system logs for repeated failed authentication attempts or unauthorized access to Dedicated Service Tools (DST) or System Service Tools (SST).

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Impact Analysis

The impact includes potential system downtime or degraded performance due to a denial of service. An attacker could exploit this to make the system unavailable for legitimate users, affecting productivity and operations.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by exposing sensitive information through improper access control. A local attacker could cause a denial of service, which may lead to unauthorized access or disclosure of data, violating confidentiality requirements in these regulations.

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Mitigation Strategies

Apply the provided PTFs (MJ11633, MJ11634, MJ11635, MJ11636) for your IBM i version to address the vulnerability. Upgrade to a supported version if running an unsupported release. No workarounds are currently available.

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