CVE-2017-20204 DBLTek GoIP Telnet Admin Interface Undocumented Backdoor

DBLTek GoIP devices models GoIP 1, 4, 8, 16, and 32 contain an undocumented vendor backdoor in the Telnet administrative interface that allows remote authentication as an undocumented user via a proprietary challenge–response scheme which is fundamentally flawed. Because the challenge response ca...