Incorrect Access Control in TOTOLINK T6 Firmware

Executive Summary

This vulnerability is an incorrect access control issue in the getCloudSrvCheckStatus function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve cloud firmware check status information 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 POST requests sent to /cgi-bin/cstecgi.cgi on TOTOLINK T6 devices. Check for unauthenticated requests attempting to access the getCloudSrvCheckStatus function. Use network traffic analysis tools like tcpdump or Wireshark to capture and inspect HTTP POST requests targeting this endpoint.

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Impact Analysis

This vulnerability could allow attackers to gather sensitive information about the device's firmware status without authentication. This may enable further exploitation or reconnaissance for additional attacks targeting the device or network.

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Compliance Impact

This vulnerability allows unauthenticated access to sensitive cloud firmware check status information, which could potentially expose confidential data. Such unauthorized access may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data privacy) by enabling data breaches or unauthorized data retrieval.

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Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version if a patch is available. If no patch exists, restrict access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules or network segmentation. Disable unnecessary services and monitor device logs for suspicious POST requests to this path.

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