Path Traversal in HTMLy CMS via Delete Username Endpoint

Executive Summary

This vulnerability is a path traversal issue in danpros HTMLy up to version 3.1.1. It exists in the Delete Username Endpoint, specifically in the unlink function of the file /system/htmly.php. An attacker can manipulate the File argument to perform path traversal, potentially accessing or deleting files outside intended directories. The exploit is publicly available and can be launched remotely.

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Detection Guidance

Detecting this vulnerability requires checking for the presence of danpros HTMLy version 3.1.1 or earlier. Inspect web server logs for unusual file deletion requests targeting /system/htmly.php with path traversal patterns in the 'File' argument. Look for requests containing sequences like '../' or similar traversal attempts.

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Impact Analysis

This vulnerability could allow an attacker to delete or access sensitive files on the server where HTMLy is hosted. If exploited, it may lead to unauthorized data exposure, system disruption, or further attacks. The impact depends on the server's configuration and the files accessible via the path traversal.

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Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA if it results in unauthorized access or deletion of personal or health data. GDPR requires protection of personal data, while HIPAA mandates safeguards for health information. Exploitation may violate these regulations, leading to legal and financial penalties.

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Mitigation Strategies

Immediately update danpros HTMLy to a version beyond 3.1.1 if available. If no update exists, disable the Delete Username Endpoint or restrict access to authenticated users only. Monitor network traffic for suspicious file deletion attempts and apply web application firewall rules to block path traversal patterns.

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