IBM i Multipart Parser Security Bypass Vulnerability

Executive Summary

This vulnerability in IBM i versions 7.6, 7.5, 7.4, and 7.3 allows a remote authenticated attacker to bypass security restrictions. The issue stems from an interpretation conflict in the multipart parser, which could be exploited to manipulate input handling.

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Detection Guidance

This vulnerability involves an interpretation conflict in the multipart parser of IBM i systems. Detection requires checking for unusual multipart request handling or security bypass attempts. Review IBM i system logs for authentication anomalies or unauthorized access patterns. Use network monitoring tools to inspect HTTP requests for malformed multipart data. IBM i command WRKACTJOB can help monitor active jobs for suspicious activity.

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Impact Analysis

An attacker could exploit this to bypass security controls, potentially gaining unauthorized access to sensitive data or performing actions they should not be able to. The impact is limited due to the low CVSS score (3.0), indicating restricted conditions for exploitation.

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Compliance Impact

The vulnerability allows remote authenticated attackers to bypass security restrictions due to an interpretation conflict in the multipart parser. This could potentially lead to unauthorized access or data exposure, which may impact compliance with standards like GDPR or HIPAA that require strict access controls and data protection measures.

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Mitigation Strategies

Apply IBM i PTFs or updates addressing the multipart parser interpretation conflict. Restrict remote authenticated access to trusted users and monitor for unusual activity.

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