Rule:  
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Sid:
491

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Summary:
This event is generated when a failed attempt to login to an FTP server
is detected.

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Impact:
Unknown. Multiple events may indicate an attempt to enumerate accounts
and passwords using brute force methodology.

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Detailed Information:
This event is generated when a failed attempt to login to an FTP server
is detected.

Multiple events may indicate an attempt to enumerate accounts
and passwords using brute force methodology.

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Affected Systems:
	All FTP Servers
 
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Attack Scenarios:

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Ease of Attack:
Simple.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
Check FTP logs for access attempts.

Disallow FTP access from sources external to the protected network.

Consider using Secure Shell as a replacement for FTP services.

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Contributors:
Sourcefire Vulnerability Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

RFC:
http://www.faqs.org/rfcs/rfc959.html

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