Incorrect Access Control in TOTOLINK T6 Firmware

Executive Summary

This vulnerability is an incorrect access control issue in the TOTOLINK T6 router firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve IP and port filtering rules by sending a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint.

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Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi from unauthorized sources. Check server logs for unusual access patterns or requests containing IP and port filtering rules. Use tools like tcpdump or Wireshark to capture and analyze HTTP POST requests targeting this endpoint.

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Impact Analysis

An attacker could exploit this to gather sensitive network configuration details, including IP and port filtering rules. This information could be used to plan further attacks on the network, such as bypassing security controls or identifying vulnerable services.

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Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version if a patch is available. Restrict access to the /cgi-bin/cstecgi.cgi endpoint by configuring firewall rules to block unauthorized POST requests. Disable unnecessary services and ensure strong authentication mechanisms are in place for administrative interfaces.

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