My 2 cents... Using ARP Cache Poisoning can actually force traffic to flow trough your host, The man may get into the middle at any time in this scenario :-) ARP Cache Poisoning/CAM Floodind/DHCP,BOOTP Spoofing is old school, but some, still very effective on most of today's networks. You may wish to play around with Cain&Able, dsniff, hunt etc.. Some not so old attacks explore protocols like STP/VTP/DTP/HSRP. One may use Vlan hoping/jumping attacks to trunk traffic from different VLANs, this will let the attacker sniff traffic from remote broadcast domains as far as they participate on the same VTP domain. Cheers.. -----Original Message----- From: full-disclosure-bounces@xxxxxxxxxxxxxxxxx [mailto:full-disclosure-bounces@xxxxxxxxxxxxxxxxx] On Behalf Of Neil Davis Sent: quarta-feira, 12 de Abril de 2006 16:42 To: full-disclosure@xxxxxxxxxxxxxxxxx Subject: [Full-disclosure] RE: info on ip spoofing please > Hello all, > At > http://www.iss.net/security_center/advice/Underground/Hacking/Methods/ > Technical/Spoofing/default.htm > > was this comment :- > > QUOTE " > Examples of spoofing: > > man-in-the-middle > packet sniffs on link between the two end points, and can therefore > pretend to be one end of the connection " > > My question is How can you sniff packets on a link that your machine > is NOT on ie NOT on the same subnet?? > > Why am I at a loss to understand this. Is there a command/software > that allows one to > say: sniff packets on port x of IP xxx.xxx.xxx.xxx ? > > Please put me out of my agony on this. > Thanks for any info you can give. > > > Ian t I think you misread the information, this part of it to be exact: Examples of spoofing: man-in-the-middle packet sniffs ____on link between the two end points____, and can therefore pretend to be one end of the connection " The answer to your question is you can't. You can only do this on a machine that the traffic is flowing through. Hence the name, "man-in-the-middle". You need to comprimise a machine between the endpoints, such as a firewall, router, or proxy, or one of the endpoints themselves so you can sourceroute through a machine of your choosing (though if you have comprimised an endpoint, this isn't necessary). You then run ettercap, and can even read their SSL/SSH conversations and change data. man-in-the-middle is a wicked attack. It's also fairly difficult to get there, if the machines concerned are patched, up to date, and securely configured, as so often they are not. On ms proxy server, all you need to do is comprimise the proxy server. The session ID's, if on query string, are logged, even when they are via ssl, you can easily hijack a session that way, simply by looking at the proxy log's recent entries, in a lot of cases (note: I am not sure if ms proxy server does this on more recent versions, and I am sure it's possible to turn this logging off). No packet analysis necessary. -Viz _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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