An issue was discovered on V-SOL V1600D4L V1.01.49 and V1600D-MINI V1.01.48 OLT devices. During the process of updating the firmware, the update script starts a telnetd -l /bin/sh process that does not require authentication for TELNET access.
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Link | Tags |
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https://seclists.org/fulldisclosure/2020/Jul/14 | mailing list exploit third party advisory |