Password files stored on improperly secured systems may be subject to password guessing attacks.
Password files can be subjected to attacks based using dictionaries or user information. Attackers often use programs that can quickly subject a password file to thousands of combinations of words, and can often guess at least one poor password in a file. Unauthenticated, remote attackers can use this method to gain access to user accounts with weak, null, or bad passwords.
Cisco Systems Cisco Intrusion Prevention System (IPS) 5.1
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