Unauthenticated Mesh Configuration Alteration in TOTOLINK T6

Executive Summary

This vulnerability is an incorrect access control issue in the setWiFiMeshConfig function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to modify mesh network configurations by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

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Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi with parameters related to WiFi mesh configuration. Check if unauthenticated requests are modifying mesh settings. Use tools like tcpdump or Wireshark to capture and analyze traffic to this endpoint.

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Impact Analysis

An attacker could exploit this to change your WiFi mesh settings, potentially disrupting your network, allowing unauthorized access to your network, or intercepting traffic. This could lead to loss of network control or privacy.

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Compliance Impact

This vulnerability allows unauthenticated attackers to alter mesh configurations via crafted POST requests, which could lead to unauthorized network access or data exposure. Such unauthorized access may violate compliance requirements under GDPR (data protection) and HIPAA (health data security) by enabling data breaches or unauthorized system modifications.

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Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version if a patch is available. Disable remote access to the web interface if not required. Restrict access to /cgi-bin/cstecgi.cgi by implementing firewall rules to block unauthorized POST requests.

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