Command Injection in H-UI Admin API

Executive Summary

This vulnerability is a command injection flaw in the h-ui administrative API (version v0.0.25 and below). It occurs because the listen configuration field does not properly validate input. Attackers with admin access can inject shell metacharacters into this field, which the application then uses to construct and execute nftables/iptables rule strings via bash -c as root. This allows arbitrary OS commands to run with root privileges.

Useful 0 Not Useful 0

Detection Guidance

To detect this vulnerability, inspect the h-ui administrative API logs for unusual nftables/iptables rule modifications or commands executed via bash -c. Check for shell metacharacters in the listen configuration field. Review system logs for unexpected root-level command executions.

Useful 0 Not Useful 0

Impact Analysis

If you use h-ui v0.0.25 or below, an authenticated attacker could exploit this to execute arbitrary commands on your system with root privileges. This could lead to full system compromise, data theft, or unauthorized modifications. Unpatched systems are at high risk if exposed to trusted administrators or if credentials are compromised.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability could violate compliance requirements under GDPR (data protection) and HIPAA (health data security) by enabling unauthorized access to sensitive systems. Exploitation may lead to data breaches, unauthorized modifications, or loss of audit trails, all of which are critical violations for these regulations.

Useful 0 Not Useful 0

Mitigation Strategies

Immediately update h-ui to a version above v0.0.25. Disable or restrict access to the administrative API until patched. Monitor network traffic for unauthorized command executions. Implement input validation for the listen field to block shell metacharacters.

Useful 0 Not Useful 0