Executive Summary

This vulnerability exists in the TOTOLINK N300RH router's web management interface, specifically in the setPasswordCfg function accessed via /cgi-bin/cstecgi.cgi. It allows an attacker to perform OS command injection by manipulating the admpass argument. This means an attacker can execute arbitrary commands on the device remotely without needing to authenticate.

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Impact Analysis

The vulnerability can have severe impacts as it allows remote attackers to execute arbitrary operating system commands on the affected router without authentication. This can lead to full compromise of the device, including unauthorized access, control over network traffic, data interception, or disruption of network services.

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Detection Guidance

This vulnerability exists in the setPasswordCfg functionality of the TOTOLINK N300RH router's web management interface at /cgi-bin/cstecgi.cgi. Detection involves checking for the presence of this endpoint and testing if the admpass parameter can be manipulated to execute OS commands without authentication.

One approach is to send crafted HTTP requests to the /cgi-bin/cstecgi.cgi endpoint with the setPasswordCfg function and the admpass parameter containing command injection payloads, then observe the response or behavior of the device.

• Use curl or similar tools to send a request like: curl -v "http://<router-ip>/cgi-bin/cstecgi.cgi?setPasswordCfg&admpass=;id"
• Check if the response contains output from the injected command (e.g., the output of the 'id' command).
• Monitor network traffic for unusual requests to /cgi-bin/cstecgi.cgi with suspicious parameters.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the web management interface to trusted networks or IP addresses to prevent remote exploitation.

Disable remote management if it is enabled, or change default credentials and ensure strong passwords are used.

Monitor the device for suspicious activity and consider applying any available firmware updates or patches from the vendor addressing this vulnerability.

If no patch is available, consider isolating the device from untrusted networks until a fix is applied.

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Compliance Impact

The vulnerability allows remote OS command injection without authentication, which can lead to unauthorized access and control over the affected device.

Such unauthorized access and potential data compromise could negatively impact compliance with standards and regulations like GDPR and HIPAA, which require protection of sensitive data and secure system management.

However, the provided information does not explicitly detail the direct effects on compliance with these regulations.

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