Path Traversal in luci-app-openvpn Leading to RCE

Executive Summary

This vulnerability in luci-app-openvpn involves improper validation of the instance_name2 parameter during file upload. Authenticated users can exploit path traversal to write arbitrary files outside the intended directory, potentially uploading malicious payloads to gain persistent root code execution by placing SSH keys in system directories.

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Detection Guidance

Detecting this vulnerability requires checking for unauthorized file uploads or suspicious activity in the luci-app-openvpn directory. Review system logs for unexpected file writes, especially in system directories like /etc/ssh or /root. Look for files with unusual names or timestamps. Monitor network traffic for unusual SSH key uploads or persistent connections.

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Impact Analysis

An attacker with authenticated access could upload malicious files to sensitive system directories, leading to persistent root-level compromise. This could allow full control over the system, unauthorized data access, or disruption of services.

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Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating confidentiality requirements in GDPR and HIPAA. Organizations may face legal penalties, reputational damage, and loss of compliance certifications if exploited.

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Mitigation Strategies

Immediately update luci-app-openvpn to the latest patched version. Restrict write permissions to system directories like /etc/ssh and /root. Disable unnecessary user accounts with upload privileges. Monitor for unauthorized file changes and revoke any suspicious SSH keys. Consider disabling the vulnerable service if an update is unavailable.

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