3151.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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Sid:
3151

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Summary: 
This event is generated when an attempt is made to access the host
filestem via fingerd.

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Impact: 
Information gathering.

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Detailed Information:
This event is generated when a specific attack against a vulnerable
version of the finger daemon is detected. 

The Finger daemon is used to provide information about users on a UNIX
system. A certain version of fingerd shipped with one release of FreeBSD
4.1.1 contained an added feature that allows a remote user to request
some files via the use of finger. This event indicates that such a
request has been made.

The feature also allowed any file or directory structure on the host
readable by the "nobody" user to also be accessed, leading to
unauthorized information disclosure.

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Affected Systems:
	FreeBSD 4.1.1 Release

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Attack Scenarios:  
An attacker can use finger to read a directory structure or file by
making a request via finger.

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Ease of Attack: 
Simple, no exploit software is required, just a specially formatted
finger query.

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False Positives: 
None Known

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False Negatives: 
None Known

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Corrective Action: 
Disable the finger daemon or limit the addresses that can access the
service via a firewall or TCP wrappers.

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Contributors: 
Sourcefire Research Team
Brian Caswell <[e-mail]>
Nigel Houghton <[e-mail]>

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Additional References:

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