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VID 14006
Severity 40
Port 23
Protocol TCP
Class TELNET
Detailed Description The accounts of the UNIX system have a default, null, blank, or missing password. and It's possible to log into the system with the account. Such accounts are a serious threat, since knowing or guessing an account name enable a hacker to access the account.

* References:
http://www.iss.net/security_center/static/43.php
Recommendation Remove/Disable the account or add a password immediately. To disable the account, place an asterisk (*) in the password field for the account in the system password file.
Related URL (CVE)
Related URL (SecurityFocus)
Related URL (ISS)