Executive Summary

CVE-2025-10107 is a command injection vulnerability in the TRENDnet TEW-831DR router firmware version 1.0. It exists in the handling of the 'sysHost' parameter in the /boafrm/formSysCmd file. Improper input sanitization allows an attacker, after authenticating and obtaining a CSRF token, to inject arbitrary shell commands remotely by manipulating this parameter. This can lead to execution of commands on the device's operating system, enabling actions like starting a telnet daemon or other malicious activities. [1, 2]

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can lead to severe impacts including remote code execution on the affected device, full system compromise, spawning backdoor shells, exfiltration of sensitive data, and lateral movement within internal networks. It affects the confidentiality, integrity, and availability of the system. Exploitation requires authentication but can be performed remotely with relative ease, and a public proof-of-concept exploit exists. [1, 2]

Useful 0 Not Useful 0

Detection Guidance

This vulnerability can be detected by monitoring for suspicious POST requests to the endpoint /boafrm/formSysCmd, especially those containing the sysHost parameter with unusual or command-injection-like values (e.g., containing '&&' or shell commands). Detection can involve inspecting HTTP logs or using network monitoring tools to filter POST requests to /boafrm/formSysCmd. A possible command to detect such attempts on a system with access logs is: grep -i 'POST /boafrm/formSysCmd' /path/to/access.log | grep 'sysHost=.*&&.*' to find injected commands. Additionally, monitoring for unexpected telnet daemon startups or unusual processes may indicate exploitation. [2]

Useful 0 Not Useful 0

Mitigation Strategies

Immediate mitigation steps include replacing the affected TRENDnet TEW-831DR device or upgrading its firmware if a patch becomes available. Since no vendor patch or official fix exists, it is recommended to restrict network access to the device, especially blocking remote access to the /boafrm/formSysCmd endpoint. Input validation should be implemented to allow only safe hostnames or IP addresses for the sysHost parameter, using regular expressions. Employing sandboxing or chroot environments to contain command execution is advised if the functionality is necessary. Ultimately, replacing the vulnerable device is the most effective mitigation. [1, 2]

Useful 0 Not Useful 0