GEN:SID | 1:476 |
Message | ICMP webtrends scanner |
Summary | This event is generated when Webtrends Security Scanner generates an ICMP echo request message.
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Impact | ICMP echo requests are used to determine if a host is running at a specific IP address. A remote attacker can scan a large range of hosts using ICMP echo requests to determine what hosts are operational on the network.
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Detailed Information | Webtrends Ecurity Scanner generates a ICMP Echo Request message containing the following hex signature:
|00000000454545454545454545454545|
By searching for this string in a packet, it is possible to determine the type of host that generated the request.
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Affected Systems | |
Attack Scenarios | A remote attacker might scan a large range of hosts using ICMP echo requests to determine what hosts are operational on the network.
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Ease of Attack | Simple. The "ping" utility found on most operating systems can generate these types of ICMP messages.
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Corrective Action | To prevent information gathering, use a firewall to block incoming ICMP Type 8 Code 0 traffic.
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Additional References | http://www.whitehats.com/info/IDS307
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Rule References | arachnids: 307
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