ftpd.c in (1) wu-ftpd 2.4.2 and (2) ftpd in HP HP-UX B.11.11 assigns
uid 0 to the FTP client in certain operating-system misconfigurations
in which PAM authentication can succeed even though no passwd entry is
available for a user, which allows remote attackers to gain
privileges, as demonstrated by a login attempt for an LDAP account
when nsswitch.conf does not specify LDAP for passwd information.
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