Vulnerability Details

Ping Host

Published: 2009-10-26 09:02:32

CVSS Base Vector:

This detection determines whether a remote host is alive by getting a response when sending a request.

Detection Method:
Several methods can be configured for detecting whether a host is alive: - An ICMP message is sent to the host and a response is taken as alive sign. - An ARP request is sent and a response is taken as alive sign. - A number of typical TCP services are tried and their presence is taken as alive sign. None of the methods is failsafe. It depends on network and/or host configurations whether they succeed or not. Both, false positives and false negatives, can occur. Therefore the methods are configurable. If you select to consider the hosts as alive, this can cause considerable timeouts and therefore a long scan duration in case the hosts are in fact not available.

Technical Details:
The detection methods might fail for the following reasons: - ICMP: This might be disabled for an environment and would then cause false negatives as hosts are believed to be dead that actually are alive. In contrast it is also possible that a Firewall between the scanner and the target host is answering to the ICMP message and thus hosts are believed to be alive that actually are dead. - TCP ping: Similar to the ICMP case a Firewall between the scanner and the target might answer to the sent probes and thus hosts are believed to be alive that actually are dead.

Detection Type:
Remote Banner

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