OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is
enabled, allows remote attackers to determine the existence of user
accounts by attempting to authenticate via S/KEY, which displays a
different response if the user account exists, a similar issue to
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
FULLDISC:20070421 OpenSSH - System Account Enumeration if S/Key is used
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