Dir 456U Firmware
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Hardcoded telnet backdoor in D-Link DIR-456U Hardware Revision A1 firmware grants remote unauthenticated attackers root shell access using static credentials ('Alphanetworks' / 'whdrv01_dlob_dir456U'). The telnet daemon launches automatically at boot via /etc/init0.d/S80telnetd.sh and validates credentials through strcmp() comparison against hardcoded values in /etc/config/image_sign. Device is End-of-Life with no patches forthcoming. CVSS 9.8 reflects network-accessible unauthenticated remote code execution, though exploitation requires local network access to telnet service.
Hardcoded telnet backdoor in D-Link DIR-456U Hardware Revision A1 firmware grants remote unauthenticated attackers root shell access using static credentials ('Alphanetworks' / 'whdrv01_dlob_dir456U'). The telnet daemon launches automatically at boot via /etc/init0.d/S80telnetd.sh and validates credentials through strcmp() comparison against hardcoded values in /etc/config/image_sign. Device is End-of-Life with no patches forthcoming. CVSS 9.8 reflects network-accessible unauthenticated remote code execution, though exploitation requires local network access to telnet service.