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NAME IMR -- an ARP table attack program SYNOPSIS imr *ether_addr* *ip_addr* *ether_addr* *ip_addr* *ether_addr* *ip_addr* *interface* [*logfile*] DESCRIPTION IMR is short for 'In Medias Res'. It is a program that allows you to perform an ARP table attack on two hosts, named *client* and *server*. Thus, all traffic from the server to the client will be sent to you, as well as all traffic from the client to the server. IMR simply routes all incoming data to the appropriate host and logs it to your disk for further inspections. IMR gives you the ability to check whether your network is secured against ARP attacks. Furthermore, it allows you to analyze networking protocols in great detail without changing data. HOW IT WORKS This is what IMR does: Send (forged) ARP replies Two ARP replies of the form 'a.b.c.d is at AB:CD:EF:GH' are sent to both the client and the server, hence ensuring that both hosts consider this PC the current communication partner. Read data Now all incoming data is read. A loop checks whether they originate from the client or from the server. During this check, the destination address of the current Ethernet frame is set to the proper MAC address, so that the packets don't get stuck. Log data Everything is logged in raw format, i.e. each packet plus all of its payload is written to the disk. The log file does not look good, but it will allow a complete reconstruction of each packet. Reset the ARP tables After the routing has been cancelled, two ARP replies are sent that restore the ARP table, so that the proper MAC addresses are set. WHY IT WORKS To work properly, ARP needs an ARP table, in which pairs of MAC addresses and IP addresses are saved. This is why your kernel 'knows' the destination address of the Ethernet frame. Unfortunately, ARP doesn't check whether packets have been requested or not. So you are able to poison the ARP table by sending your own ARP replies that say something like 'You will find this IP address at my MAC address'. There is no possibility for ARP to validate your MAC address / IP address pair, so it will be added to the table. CAVEATS Please be aware of the fact that IMR is a diagnostic application. The code will give you some information about the *Berkeley Packet Filter*, BPF, but IMR is really *not* meant as an attack tool of any sort. Even if you are the administrator of your LAN, you are by no means allowed to capture the data of your users without telling them... OTHER INFO You might find newer versions of IMR at http://canmore.sdf-eu.org COPYRIGHT IMR is licenced under the GNU General Public Licence. Read the file GPL in IMR's directory for more information. AUTHOR IMR has been written by Bastian Rieck <canmore [AT] sdf-eu.org>
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In medias res: a demo program for performing ARP attacks using FreeBSD's BPF device
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