1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
|
Rule:
--
Sid:
382
--
Summary:
This event is generated when an ICMP echo request is made from a Windows 9x or 2000 host.
--
Impact:
Information gathering. An ICMP echo request can determine if a host is active.
--
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 Windows 9x or 2000 host contains a unique payload in the message request.
--
Affected Systems:
All
--
Attack Scenarios:
An attacker may attempt to determine live hosts in a network prior to launching an attack.
--
Ease of Attack:
Simple
--
False Positives:
An ICMP echo request may be used to legimately troubleshoot networking problems.
--
False Negatives:
None known.
--
Corrective Action:
Block inbound ICMP echo requests.
--
Contributors:
Original rule written by Max Vision <vision@whitehats.org>
Documented by Steven Alexander<alexander.s@mccd.edu>
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>
--
Additional References:
Arachnids:
http://www.whitehats.com/info/IDS169
--
|