This Metasploit module exploits a pre-auth file upload to install a new root user to /etc/passwd and an SSH key to /etc/dropbear/authorized_keys. FYI, /etc/{passwd,dropbear/authorized_keys} will be overwritten. /etc/persistent/rc.poststart will be overwritten if PERSIST_ETC is true. This method is used by the "mf" malware infecting these devices.
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