CWMP Stack Buffer Overflow in Cudy TR3000

Executive Summary

Cudy TR3000 before 2.5.42 has a stack buffer overflow in its CWMP client. A malicious ACS can exploit this by sending oversized Username and Password values (up to 256 bytes) in TR-069 Download or Upload requests. This overflows 128-byte stack buffers, corrupting memory and crashing the CWMP process.

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Detection Guidance

Detect this vulnerability by monitoring TR-069 traffic for Download or Upload requests with Username or Password fields exceeding 128 bytes. Inspect CWMP process logs for crashes or stack corruption errors. Use network sniffing tools like tcpdump or Wireshark to capture TR-069 packets and analyze payload sizes.

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Impact Analysis

If you use a vulnerable Cudy TR3000 device, an attacker controlling the ACS could crash the CWMP process, causing service disruption. This may lead to loss of remote management functionality or device instability.

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Mitigation Strategies

Immediately update Cudy TR3000 firmware to version 2.5.42 or later. Disable TR-069 remote management if not required. Restrict access to the CWMP port (typically 7547) using firewall rules. Monitor for unusual ACS connections or large credential fields in TR-069 requests.

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