Incorrect Access Control in TOTOLINK T6 Firmware

Executive Summary

This vulnerability is an incorrect access control issue in the freeStaClient function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to forcibly disconnect wireless clients by sending a specially crafted MQTT message to the cs_broker component.

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Detection Guidance

Detecting this vulnerability requires monitoring for unauthorized MQTT messages targeting the cs_broker component. Check network traffic for unexpected MQTT packets sent to the device's IP address. Use tools like tcpdump or Wireshark to capture and analyze MQTT traffic on port 1883 or 8883. Inspect logs for repeated disconnection events without user action.

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Impact Analysis

This vulnerability could allow attackers to disrupt your wireless network by disconnecting devices without authentication. This may cause network outages, loss of connectivity for critical devices, or denial of service for users relying on the network.

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Compliance Impact

This vulnerability allows unauthenticated attackers to forcibly disconnect wireless clients via crafted MQTT messages, which could disrupt network operations. Such unauthorized access may violate compliance requirements for data availability and integrity under standards like GDPR and HIPAA, depending on the affected system's use case.

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Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version if a patch is available. Disable MQTT access to the device from untrusted networks by blocking port 1883/8883 at the firewall. Isolate the device on a separate VLAN to limit exposure. Monitor for unusual disconnection events as a sign of exploitation.

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