508.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:
508

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Summary:
This event is generated when a Gopher server is used as a proxy to connect to an FTP server.

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Impact:
This allows a user to assume the source IP of the Gopher server when connecting to an FTP server.

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Detailed Information:
A Gopher server may support proxy connections to FTP servers.  This allows a user to assume the source IP of the Gopher server when connecting to an FTP server.  This may be used to bypass FTP access restrictions based on source IP's.  

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Affected Systems:
Any Gopher server that supports proxy connections to FTP servers.

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Attack Scenarios:
A user who is normally restricted access to an FTP server based on the originating IP may attempt to circumvent this by attempting access from a Gopher server that supports proxy connections to FTP servers.

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Ease of Attack:
Simple.  

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False Positives:
This even will trigger if a Gopher server suuports proxy connections to FTP servers. 

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False Negatives:
None Known.

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Corrective Action:
Disable the use of Gopher server.

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Contributors:
Original rule written by Max Vision <[e-mail]>
Sourcefire Research Team
Judy Novak <[e-mail]>

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Additional References:

Whitehats
www.whitehats.com/info/IDS409

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