sshd in OpenSSH 3.6.1p2 and earlier, when PermitRootLogin is disabled and using PAM keyboard-interactive authentication, does not insert a delay after a root login attempt with the correct password, which makes it easier for remote attackers to use timing differences to determine if the password step of a multi-step authentication is successful, a different vulnerability than CVE-2003-0190.
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=248747
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf