[原文]Kyocera 3830 (aka FS-3830N) printers have a back door that allows remote attackers to read and alter configuration settings via strings that begin with "!R!SIOP0", as demonstrated using (1) a connection to to TCP port 9100 or (2) the UNIX lp command.
Kyocera FS-3830N Port 9100 Unauthenticated Command Execution
Remote / Network Access
Loss of Integrity
Kyocera FS-3820N printers contain a flaw that may allow a malicious user to issue arbitrary commands. The issue is triggered because access to the service on TCP port 9100 is unauthenticated. It is possible that the flaw may allow execution of arbitrary commands, resulting in a loss of integrity.
Currently, there are no known upgrades, patches, or workarounds available to correct this issue.