Pipe to Grep Posted April 20, 2017 Share Posted April 20, 2017 I ran an Arp Spoof attack against my win 10 system and the only thing that happened was denial of service. I had two shells open on my kali linux VM one with arpspoof -i wlan0 -t 192.168.1.1 -r 192.168.1.1 and the other with arpspoof -i wlan0 -t 192.168.1.1 -r 192.168.1.105. When I initiate the attack, both the computer being attacked (x.x.x.105) as well as the the gateway IP lose service. My other PC's still maintained internet. When I say gateway, I mean the router settings pages. It goes to page can't be resolved or whatever. Quote Link to comment Share on other sites More sharing options...
Pipe to Grep Posted April 20, 2017 Author Share Posted April 20, 2017 Also, I've tried to disable the router firewall to no avail Quote Link to comment Share on other sites More sharing options...
digip Posted April 20, 2017 Share Posted April 20, 2017 This is common. Specifically on physical switched networks. Wifi, is a little more lenient with this kind of attack for sitting between two targets and works better when the you are closer to the router than the victim. In a wired network, this can cause issues. Also, if a system uses static entries in it's arp table, this will make things stop working. However, make sure you have IP forward set to 1 for the arp spoofing. Enabling arpspoof without it, could also cause things to stop working. In the past you would do something like echo "1" > /proc/sys/net/ipv4/ip_forward But not 100% sure that's still valid. You'd also echo a 0 into the file, to disable. Now, with systemd, you might need to use something like: sysctl -w net.ipv4.ip_forward=1 and 0 to disable as well. If it comes back with no file and shows you the path, copy it, and run the first command I showed at the top with the path sysctl shows you to use and that should work. Quote Link to comment Share on other sites More sharing options...
Pipe to Grep Posted April 20, 2017 Author Share Posted April 20, 2017 6 hours ago, digip said: This is common. Specifically on physical switched networks. Wifi, is a little more lenient with this kind of attack for sitting between two targets and works better when the you are closer to the router than the victim. In a wired network, this can cause issues. Also, if a system uses static entries in it's arp table, this will make things stop working. However, make sure you have IP forward set to 1 for the arp spoofing. Enabling arpspoof without it, could also cause things to stop working. In the past you would do something like echo "1" > /proc/sys/net/ipv4/ip_forward But not 100% sure that's still valid. You'd also echo a 0 into the file, to disable. Now, with systemd, you might need to use something like: sysctl -w net.ipv4.ip_forward=1 and 0 to disable as well. If it comes back with no file and shows you the path, copy it, and run the first command I showed at the top with the path sysctl shows you to use and that should work. 8 Thanks, I'll try the attack on my old vista which isn't hard wired to the router. Will the attack work on a chromebook (OOTB)? Quote Link to comment Share on other sites More sharing options...
digininja Posted April 20, 2017 Share Posted April 20, 2017 Why are you doing this? arpspoof -i wlan0 -t 192.168.1.1 -r 192.168.1.1 That will spoof 192.168.1.1 to itself because of the -t and to itself again because of the -r Quote Link to comment Share on other sites More sharing options...
Pipe to Grep Posted April 20, 2017 Author Share Posted April 20, 2017 3 minutes ago, digininja said: Why are you doing this? arpspoof -i wlan0 -t 192.168.1.1 -r 192.168.1.1 That will spoof 192.168.1.1 to itself because of the -t and to itself again because of the -r That was in the tutorial by Ermin Kreponic. If this is wrong he might have fixed it in the next 5 minutes. oops Quote Link to comment Share on other sites More sharing options...
digininja Posted April 20, 2017 Share Posted April 20, 2017 You should never run a command without understanding what it is doing. Look at the man page for arpspoof and it will explain what the flags mean and what the IP addresses are representing. Quote Link to comment Share on other sites More sharing options...
Pipe to Grep Posted April 20, 2017 Author Share Posted April 20, 2017 2 minutes ago, digininja said: You should never run a command without understanding what it is doing. Look at the man page for arpspoof and it will explain what the flags mean and what the IP addresses are representing. I agree 100%. I never want to be a script kiddie, but I gave it the benefit of the doubt. Quote Link to comment Share on other sites More sharing options...
digip Posted April 21, 2017 Share Posted April 21, 2017 On 4/20/2017 at 3:46 PM, digininja said: Why are you doing this? arpspoof -i wlan0 -t 192.168.1.1 -r 192.168.1.1 That will spoof 192.168.1.1 to itself because of the -t and to itself again because of the -r You know, i didn't even catch that part in his first post. Good catch. Quote Link to comment Share on other sites More sharing options...
digininja Posted April 21, 2017 Share Posted April 21, 2017 I noticed it in the email but didn't have access to a man page to check it so didn't want to say anything straight away just in case it was correct usage. Quote Link to comment Share on other sites More sharing options...
digip Posted April 21, 2017 Share Posted April 21, 2017 Just now, digininja said: I noticed it in the email but didn't have access to a man page to check it so didn't want to say anything straight away just in case it was correct usage. Yeah, for whatever reason, I see when doing arp spoof, you put the gateway and target in one console, and the reverse in another. Totally missed he was arping the gateway against itself. That in itself will kill things..lol. Quote Link to comment Share on other sites More sharing options...
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