Vulnerability Development mailing list archives
Re: Hijack IP Address using cable modem
From: Nick Summy <playboy () NETINS NET>
Date: Wed, 28 Mar 2001 21:54:34 -0600
This is a good theory, but there are a couple of flaws (i think) I beleive that each cable modem has a MAC address, so the network would look for the cable modems mac address, not the NIC's. Just as it is with any network, I dont beleive 2 of the same MAC addresses can be on the network, nor can 2 of the same ip be on the network. I think if this were to work at all, the attacker would get the ip address, the server would think the victim got the ip, and the victim would be without service. Another thought: If it is possible to change the MAC address of your cable modem wouldnt it just be easier to make up a MAC address to change it to? that way the sever would have no idea who actually recieved the ip address -----Original Message----- From: VULN-DEV List [mailto:VULN-DEV () SECURITYFOCUS COM]On Behalf Of Patrick Patterson Sent: Wednesday, March 28, 2001 10:31 AM To: VULN-DEV () SECURITYFOCUS COM Subject: Re: Hijack IP Address using cable modem -----BEGIN PGP SIGNED MESSAGE----- I think I see where Patrick was coming from with this: Victim turns on his computer, and gets an IP address Cracker, while sniffing the Cable segment notices that IP adress foo is assigned to MAC bar Cracker changes his own MAC address to bar, and brings up IP address foo on this new MAC address (some Ethernet cards have overwritable MAC addresses) Since both Cracker and Victim have the same MAC, Cracker get's all packets for Victims computer, and is able to impersonate victim. This is just a slightly more sophisticated IP Address Spoofing attack.... and I don't think it will work...
From what I know of Cablemodem networks, there are actually several parts.
1: The cable network - the 'Modem' talks to the Cable Company terminal equipment and ensures that you are a valid subscriber. 2: The IP Network - the routers keep track of which IP and MAC, is on which Cable Modem - thus making this attack unlikely to succeed.... I haven't tested this, and might be horribly wrong, but I don't think so - this is one of those things that looks better in theory than in practice - Is anyone from @HOME or ATT around to confirm/deny what's I've written? On Wednesday 28 March 2001 09:09, Nick Summy wrote:
Now I hardly know anything about this subject, so correct me If im wrong, but I have a few questions.
<SNIP> - -- Patrick Patterson Tel: +1 514 485-0789 President, Chief Security Architect Fax: +1 514 485-4737 Carillon Information Security Inc. E-Mail: ppatterson () carillonis com - ----------------- The New Sound of Network Security ----------------- << http://www.carillonis.com >>
Current thread:
- Re: Hijack IP Address using cable modem, (continued)
- Re: Hijack IP Address using cable modem Nick Summy (Mar 28)
- Re: Hijack IP Address using cable modem Patrick Patterson (Mar 28)
- Re: Hijack IP Address using cable modem cdowns (Mar 28)
- Re: Hijack IP Address using cable modem Larry W. Cashdollar (Mar 28)
- Re: Hijack IP Address using cable modem Bill Munger (Mar 29)
- Re: Hijack IP Address using cable modem Mathias Wegner (Mar 28)
- Re: Hijack IP Address using cable modem Dick Visser (Mar 28)
- Re: Hijack IP Address using cable modem Reb (Mar 29)
- Re: Hijack IP Address using cable modem Patrick Patterson (Mar 28)
- Re: Hijack IP Address using cable modem Patrick Maartense (Mar 28)
- Re: Hijack IP Address using cable modem Patrick Maartense (Mar 28)
- Re: Hijack IP Address using cable modem Nick Summy (Mar 29)
- Re: Hijack IP Address using cable modem David Laganière (Mar 29)
- Re: Hijack IP Address using cable modem Clayton Hoskinson (Mar 29)
- Re: Hijack IP Address using cable modem Nick Summy (Mar 28)
- Re: Hijack IP Address using cable modem moksha faced (Mar 29)
- Re: Hijack IP Address using cable modem cdowns (Mar 29)