>We think that Mosh's conservative design means that its attack surface compares favorably with more-complicated systems like OpenSSL and OpenSSH. Mosh's track record has so far borne this out. Ultimately, however, only time will tell when the first serious security vulnerability is discovered in Mosh—either because it was there all along or because it was added inadvertently in development. OpenSSH and OpenSSL have had more vulnerabilities, but they have also been released longer and are more prevalent.
> In one concrete respect, the Mosh protocol is more secure than SSH's: SSH relies on unauthenticated TCP to carry the contents of the secure stream. That means that an attacker can end an SSH connection with a single phony "RST" segment. By contrast, Mosh applies its security at a different layer (authenticating every datagram), so an attacker cannot end a Mosh session unless the attacker can continuously prevent packets from reaching the other side. A transient attacker can cause only a transient user-visible outage; once the attacker goes away, Mosh will resume the session.
> However, in typical usage, Mosh relies on SSH to exchange keys at the beginning of a session, so Mosh will inherit the weaknesses of SSH—at least insofar as they affect the brief SSH session that is used to set up a long-running Mosh session.