IBM i Race Condition Leads to File Ownership Escalation

Executive Summary

This vulnerability is a time-of-check to time-of-use (TOCTOU) race condition in IBM i versions 7.6, 7.5, 7.4, and 7.3. A local attacker could exploit this to gain ownership of arbitrary file system objects.

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Detection Guidance

Detection of this TOCTOU race condition vulnerability requires manual inspection of IBM i system configurations and file permissions. Check for improperly set file ownerships or permissions that could allow unauthorized access. Review system logs for unusual file ownership changes or privilege escalation events. IBM i does not provide direct commands for this specific vulnerability detection.

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Impact Analysis

A local attacker could exploit this to modify or take control of critical system files, potentially leading to unauthorized access, data manipulation, or system disruption.

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Compliance Impact

This vulnerability could compromise data integrity and access controls, potentially violating compliance requirements for GDPR, HIPAA, and other standards that mandate strict file access controls and auditability.

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Mitigation Strategies

Apply IBM i PTFs or updates provided by IBM to address the TOCTOU race condition. Monitor IBM i security advisories for patches and implement strict file system access controls to limit user permissions.

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