Bugzilla – Bug 628772
VUL-0: CVE-2007-2768: openssh / OPIE PAM module discloses users
Last modified: 2014-09-26 12:17:20 UTC
(for the record only) CVE-2007-2768 OpenSSH, when using OPIE (One-Time Passwords in Everything) for PAM, allows remote attackers to determine the existence of certain user accounts, which displays a different response if the user account exists and is configured to use one-time passwords (OTP), a similar issue to CVE-2007-2243.
it's a unavoidable drawback of using one time passwords