It has recently been identified that SuSE 9.1 Live edition (a bootable CD-ROM edition) allows passwordless remote root logins via ssh due to a configuration error. This includes the Live CD that is included with SuSE 9.1 Personal Edition.
All SuSE 9.1 Live users should see the full advisory for a temporary work around as well as a URL for the fixed version.
http://www.suse.com/de/security/2004_11_live_cd_91.html