489.txt

snort入侵检测规则文件2.4 Snort是众所周知的网络入侵检测工具

Rule:
  
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Rule:
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Sid:
489

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Summary:
This event is generated when an attempt is made to log into an ftp 
server with an empty password.

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Impact:
Possible unauthorized access, invalid login attempt.

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Detailed Information:
An attempt was made to log into an ftp server with an empty password. 
This is an unusual behavior as every ftp login usually has a password, 
even anonymous ones. An empty password might mean the system was already
compromised and a username exists with no password.

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Affected Systems:
Machines running ftp servers.

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Attack Scenarios:
An attacker gains access to the system via a vulnerability, creates a 
login without a password and then tries to ftp to the system with that 
login.

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Ease of Attack:
Simple, no exploit software required.

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False Positives:
There might be legitimate users on the system with empty passwords, but 
not very likely.

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False Negatives:
None known.

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Corrective Action:
Check all the usernames on the system for empty passwords.

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Contributors:
Original Rule Writer Max Vision <[e-mail]>
Snort documentation contributed by Chaos <[e-mail]>

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Additional References:

Arachnids:
http://www.whitehats.com/info/IDS322

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