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Sagemcom Fast 3890 Remote Code Execution

Sagemcom Fast 3890 Remote Code Execution
Posted Jan 14, 2020
Authored by Lyrebirds

This exploit uses the Cable Haunt vulnerability to open a shell for the Sagemcom F@ST 3890 (50_10_19-T1) cable modem. The exploit serves a website that sends a malicious websocket request to the cable modem. The request will overflow a return address in the spectrum analyzer of the cable modem and using a rop chain start listening for a tcp connection on port 1337. The server will then send a payload over this tcp connection and the modem will start executing the payload. The payload will listen for commands to be run in the eCos shell on the cable modem and redirect STDOUT to the tcp connection.

tags | exploit, overflow, shell, tcp
SHA-256 | 658e656e50297dc9328be51b95fa17458c6d29e74f2464a318d0eabe41049aa0
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