Executive Summary

This vulnerability is a command injection flaw in the Totolink LR350 router firmware version 9.3.5u.6369_B20220309. It occurs in the setDiagnosisCfg function of the /cgi-bin/cstecgi.cgi file, where the 'ip' parameter from a POST request is not properly sanitized. Because this user-controllable input is directly used in a system command, an attacker can inject arbitrary commands remotely, leading to unauthorized command execution on the device. [1, 2]

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Impact Analysis

This vulnerability can allow an attacker to remotely execute arbitrary commands on the affected Totolink LR350 router. This can compromise the device's confidentiality, integrity, and availability, potentially allowing the attacker to control the device, disrupt network operations, or use the device as a foothold for further attacks. The exploit is publicly available and easy to execute, increasing the risk of exploitation. [1, 2]

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Detection Guidance

Detection can focus on monitoring POST requests to the /cgi-bin/cstecgi.cgi endpoint, specifically targeting the setDiagnosisCfg function with the 'ip' parameter. Suspicious or malformed 'ip' parameter values that include shell metacharacters or command injection patterns should be flagged. Network intrusion detection systems (NIDS) can be configured to alert on such POST requests. Specific commands are not provided in the resources, but inspecting HTTP POST traffic for unusual 'ip' parameter content is recommended. [1, 2]

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Mitigation Strategies

Immediate mitigation steps include replacing the affected Totolink LR350 router running firmware version 9.3.5u.6369_B20220309, as no known countermeasures or patches are available. As a precaution, restrict access to the device's management interface, monitor for suspicious activity, and consider network segmentation to limit exposure until the device can be replaced. [2]

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