Incorrect Access Control in TOTOLINK T6 Firmware

Executive Summary

This vulnerability is an incorrect access control issue in the recvClearPairCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to reset the device's pairing state and reboot it 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 on TOTOLINK T6 devices. Check device logs for unexpected reboot events or pairing state changes. Use network monitoring tools like tcpdump to capture MQTT traffic on port 1883 or 8883 for suspicious payloads.

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Impact Analysis

An attacker could exploit this to disrupt the device's operation by forcing a reboot and resetting pairing configurations. This could lead to loss of network connectivity, interrupted services, or potential unauthorized access if paired devices lose their authentication state.

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Compliance Impact

This vulnerability allows unauthenticated attackers to reset pairing state and reboot the device via crafted MQTT messages, which could disrupt device functionality and potentially lead to unauthorized access or data exposure. Such unauthorized access may violate compliance requirements under GDPR or HIPAA if the device handles sensitive data.

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Mitigation Strategies

Immediately isolate affected TOTOLINK T6 devices from untrusted networks. Disable MQTT access from external sources via firewall rules. Update the device firmware if a patch is available. Monitor device behavior for signs of exploitation and reset configurations if compromised.

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