#!/bin/sh counter=0 if [ $# -eq 0 ] then echo "You're missing the arguement of how many times for me to repeat." exit 1 fi while [ $counter -le $1 ] do ifconfig eth0 down ./changemac -r pump ifconfig eth0 coutner=`expr $counter + 1` done echo "done" Contingent on you having changemac or some other way to randomize a new mac addy. russ At 02:20 PM 1/30/2002 -0800, you wrote: > I came up with this about a year back at DefCon, and told some > friends >in hopes that either they or I would do something with it, but none of us had >time so here goes, and please feel free to write this yourself. DoS against >DHCP: > > A DHCP server has only a certain amount of addresses availible. If >you (a single malicious machine connected to the network) actively take up all >availible IP address, and compete against the machines that are currently >connected you should be able to completely take all availible IP addresses and >block access to the DHCP server. You could do this by opening many interfaces >on a linux box and asking for many DHCP addresses and lying that you connected >before any competing machines (or DoS the competing machine directly until the >DHCP server releases the IP address to you). > > This combined with war-driving could take down any DHCP IP address >block within wireless range. Kinda nasty, but only effective as long as you >stay connected to the network, so a compromised machine on the network >might be >necessary for extended DoS. Probably the way around this would be a) some >sort >of authentication to log into the DHCP server and or b) using leap or >something >similar. MAC addresses are spoofable, so it probably wouldn't be a good idea >to limit the number of times a particular MAC address connects to the network, >as that would just be a sloppy obfuscation. DHCP has always seemed like a bad >idea to me. Sorry if this seems obvious. ================================== Russell Handorf oooo, shiney ::Wanders after it:: www.russells-world.com www.philly2600.net "Computer games don't affect kids, I mean if Pacman affected us as kids, we'd all be running around in darkened rooms, munching pills and listening to repetitive music." ~unknown ==================================
This archive was generated by hypermail 2b30 : Wed Jan 30 2002 - 15:56:01 PST