File: 1778.txt

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Rule:

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Sid:
1778

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Summary:
This event is generated when an attempt is made to cause a Denial of Service (DoS) to an FTP server.

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Impact:
Serious. Denial of Service.

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Detailed Information:
Certain versions of Microsoft's IIS FTP service are vulnerable to a DoS attack. The condition exists when a user attempts to view the transfer status using the STAT command. If the user enters a large number of file globbing characters as an argument, the service will crash.

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Affected Systems:
	Microsoft IIS versions 4.0, 5.0, and 5.1
	Cisco Building Broadband Service Manager 4.0.1 - 5.1
	Cisco Call Manager 3.0 - 3.2
	Cisco Unity Server 2.0 - 2.4

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Attack Scenarios:
An attacker can cause the service to restart or hang, leaving the service unavailable to users.

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Ease of Attack:
Medium

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
Apply the appropriate vendor supplied patches.

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Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
Snort documentation contributed by Josh Sakofsky

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Additional References:

Bugtraq:
http://www.securityfocus.com/bid/4482

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