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.
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information
Official Statement from Red Hat (05/23/2007)
Not vulnerable. OPIE for PAM is not shipped with Red Hat Enterprise Linux 2.1, 3, 4, or 5.
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20070424 Re: OpenSSH - System Account Enumeration if S/Key is used
Vulnerable software and versions