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.
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
http://www.securityfocus.com/bid/7482
http://www.securityfocus.com/archive/1/320440
http://www.securityfocus.com/archive/1/320302