Bruno 3.4.2 Path Traversal Vulnerability

Executive Summary

Bruno versions through 3.4.2 do not properly validate file paths in request body declarations. Attackers can exploit this by including parent-directory traversal segments (../) in file paths. When a collection is executed, this allows reading arbitrary local files outside the intended directory and sending them to attacker-controlled endpoints.

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Detection Guidance

Check Bruno versions through 3.4.2 for file path validation failures. Monitor requests containing ../ sequences in file paths during collection execution. Inspect logs for arbitrary file reads or exfiltration attempts to external endpoints.

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Impact Analysis

This vulnerability can lead to unauthorized access to sensitive files on the system running Bruno. Attackers may steal confidential data, configuration files, or other sensitive information, potentially causing data breaches or further compromise of the system.

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Compliance Impact

This vulnerability can result in non-compliance with GDPR, HIPAA, and other regulations due to unauthorized data access or exfiltration. Organizations may face legal penalties, fines, or reputational damage if sensitive data is compromised through this flaw.

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Mitigation Strategies

Upgrade Bruno to a version beyond 3.4.2 that validates file paths. Implement strict input validation for file paths in requests. Restrict file access permissions to prevent unauthorized reads. Monitor network traffic for suspicious exfiltration attempts.

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