Is Your Network Safe

Is Your Network Safe - Toolbox Computer Security Network...

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1 Computer Security Is Your Network Safe? Original slides prepared by K. Liszka, The University of Akron for 3460:453/553 for 3460:453/553 Toolbox Network scouting OS fingerprinting Vulnerability scanner Network trace analysis Why scouting is important ? Scouting is the first step. You can’t attack what you don’t know. Scouting Process Hosts Ports Services Vulnerabilities DNS Queries Port scanning Topological Mapping DNS info DNS info Ping Traceroute Traceroute Firewalking Ping Standard : ICMP TCP works as well ARP-ping (lan only) box:~# arping 192.168.0.1ARPING 192.168.0.160 bytes from 00:21:91:f8:48:3a (192.168.0.1): index=0 time=6.410 msec60 bytes from 00:21:91:f8:48:3a (192.168.0.1): index=1 time=3.351 msec60 bytes from 00:21:91:f8:48:3a (192.168.0.1): index=2 time=2.839 msec60 bytes from 00:21:91:f8:48:3a (192.168.0.1): index=3 time=7.165 msec Finding Routers • traceroute / tracert – man traceroute – tracert /? • Play with TTL
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2 Looking Glass Servers • If you do not wish to deal with traceroute on your own computer. • In that case, you use use a Looking Glass server. • These are publicly available traceroute servers provided by volunteers as a free service. Looking Glass Servers • Go to http://www.traceroute.org/ . • However, your results will almost certainly be inconsistent with the results from your own location because they use a different path to the server. Vanilla scan – version 1 Vanilla scan – version 2 HalfOpen scan Not standard scan Violates the RFC Null scan : no flag Xmas scan : all flag Fin scan: Fin flag
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3 Null Scan The null scan turns off all flags. Creates a packet with a lack of TCP flags. This should never occur in the real world. If the port is closed, a RST frame should be returned
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Is Your Network Safe - Toolbox Computer Security Network...

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