As far as I see, the Linux Teamspeak server uses a statically linked libssh 0.7 for providing the new ssh serverquery access.
According to there is a serious security bug in libssh 0.6 and above that requires immediate fix. Unpatched servers are allowing serverquery access without providing credentials.

See also:

Is a vulnerable libssh 0.6 or above used in Teamspeak server 3.4.0?
If yes, when is an update available?