IBM i CSRF Token Bypass Vulnerability

Executive Summary

This vulnerability in IBM i 7.6, 7.5, 7.4, and 7.3 allows a remote authenticated attacker to bypass security restrictions. The issue occurs due to improper validation of anti-CSRF tokens, which are meant to prevent cross-site request forgery attacks.

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Detection Guidance

This vulnerability involves improper validation of anti-CSRF tokens in IBM i systems. Detection requires checking for unusual authentication bypass attempts or unauthorized actions performed without valid tokens. Review IBM i system logs for failed authentication events or unexpected privilege escalations. Monitor network traffic for suspicious requests targeting IBM i services.

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Impact Analysis

An attacker could exploit this flaw to perform unauthorized actions on behalf of a legitimate user. This may lead to data breaches, unauthorized system changes, or other malicious activities depending on the attacker's goals.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements such as GDPR or HIPAA. Organizations using affected IBM i versions may face regulatory penalties or increased audit scrutiny.

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Mitigation Strategies

Apply IBM i PTFs or updates that address the anti-CSRF token validation issue. Monitor IBM i security bulletins for patches and implement network-level controls to restrict unauthorized access.

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