RapidStream VPN nodes has hard-coded the 'rsadmin' account into the sshd binary in the appliance OS. The account has been given a 'null' password in which password assignment and authentication was expected to be handled by the RapidStream software itself. The vendor failed to realize that arbitrary commands could be appended to the ssh string when connecting to the SSH server on the remote vpn. This in effect could lead to many things, including the ability to spawn a remote root shell on the vpn.
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