Insufficient Data Authenticity Verification in Cudy TR3000

Executive Summary

Cudy TR3000 before 2.5.42 has a flaw in its Smart Mesh Technology (SMT) onboarding process. The vulnerability allows attackers to forge SMT messages by exploiting weak message verification. The system only uses an AES-CBC key derived from public values and a CRC32 check, which can be bypassed by adjacent unauthenticated attackers. This lets them manipulate Probe Request vendor IEs to include attacker-chosen SSIDs and pre-shared keys, tricking unpaired devices into joining attacker-controlled access points.

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Detection Guidance

Detecting this vulnerability requires monitoring for forged SMT messages in Probe Request vendor IEs. Check for unexpected SSID or pre-shared key changes in wireless traffic. Use tools like Wireshark to inspect vendor-specific information elements in probe requests for anomalies.

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Impact Analysis

This vulnerability could allow attackers to intercept or manipulate network traffic by forcing devices to connect to malicious access points. Users might experience unauthorized access to sensitive data, network disruption, or exposure to further attacks. Devices using Cudy TR3000 firmware versions before 2.5.42 are particularly at risk.

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Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating privacy requirements under GDPR and HIPAA. Organizations using affected Cudy TR3000 devices may face compliance violations, potential data breaches, and legal consequences if proper safeguards are not implemented.

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Mitigation Strategies

Immediately update Cudy TR3000 devices to firmware version 2.5.42 or later. Disable Smart Mesh Technology (SMT) if not required. Monitor network traffic for suspicious probe requests and isolate affected devices until patched.

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