369.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:
369

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Summary:
This event is generated when an ICMP echo request is made from a BayRS Router.

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Impact:
Information gathering.  An ICMP echo request can determine if a host is active.

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Detailed Information:
An ICMP echo request is used by the ping command to elicit an ICMP echo reply from a listening live host.  An echo request that originates from a BayRS router contains a unique payload in the message request.  

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Affected Systems:
All

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Attack Scenarios:
An attacker may attempt to determine live hosts in a network prior to launching an attack.

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Ease of Attack:
Simple

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False Positives:
An ICMP echo request may be used to legimately troubleshoot networking problems.

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False Negatives:
None known.

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Corrective Action:
Block inbound ICMP echo requests.

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Contributors:

Original rule written by [e-mail]  
Modified by Brian Caswell <[e-mail]>
Documented by Steven Alexander<[e-mail]>
Sourcefire Research Team
Judy Novak <[e-mail]>

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Additional References:

Bugtraq
http://www.whitehats.com/info/IDS444

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