IBM i ChrootDirectory Security Bypass Vulnerability

Executive Summary

This vulnerability in IBM i 7.3 to 7.6 allows a remote authenticated attacker to bypass security restrictions. It occurs due to improper enforcement of the ChrootDirectory configuration directive, which is meant to restrict file system access.

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Detection Guidance

This vulnerability involves improper enforcement of the ChrootDirectory configuration directive in IBM i systems. Detection requires checking system configuration files and SSH settings for misconfigurations. Review the /etc/ssh/sshd_config file for incorrect ChrootDirectory directives and verify that the configured directories exist and have proper permissions. Use commands like grep to search for ChrootDirectory entries and ls to inspect directory permissions.

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Impact Analysis

An attacker could exploit this to gain unauthorized access to restricted files or directories, potentially leading to data leakage or further system compromise. The impact includes low confidentiality and integrity loss with no availability impact.

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Compliance Impact

The vulnerability allows remote authenticated attackers to bypass security restrictions due to improper enforcement of the ChrootDirectory configuration directive. This could lead to unauthorized access to sensitive data, potentially violating compliance requirements for GDPR, HIPAA, and other regulations that mandate strict access controls and data protection measures.

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Mitigation Strategies

Apply IBM i PTFs or updates addressing the ChrootDirectory configuration issue. Review and enforce proper ChrootDirectory settings in SSH configurations. Restrict remote authenticated access to only trusted users and systems.

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