cmd_exec: Trailing line feed in command terminates ssh session

[bcoles]

Executing a command with a trailing new line (\n) using cmd_exec kills Linux ssh sessions.

The following will kill a SSH session (Reason: Died):

puts cmd_exec("id\n")

The same is not true for shell and Meterpreter sessions. The command is executed and the session survives.

[github-actions[bot]]

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