Arp Info Security

ARP ADDRESS REVERSE PROTOCOL THE arp cache can be risky here is why: lan or wireless users are at risk, tools an knowhow can be used 2 posion the cache by adding the ip address OF the hacker to the cache this address is normal faked and is easyly done what it does is redirects your traffic past a hackers pc or server which is normaly filled with explots like the ability to see past encyption ssl ssh an so on, an can be very dodgy for internet bankers , its bit like dns hijacking arp has the ability to to redirect you to phish sites ,download scripts to u an so on ,hackers using these tackits tent to be on non windows computers but not always here is what you can do about it first use ids intrusion detection system sax2 is alright eset smart security 4 is good but may need configeration now go to start then run type cmd or (command prompt) type arp -a to see the entrys for xp users and arp -d to delete the entrys or arp -d * to delete wild card entrys or arp -an to see the arp tables for vista users right click cmd and run as administrator anti arp 6 is good or arp watch . Here is Technology, Virtualization and Cloud Computing in the Web Hosting Worlds view on this matter: Home > Security > Detect ARP poisoning on LAN Detect ARP poisoning on LAN May 1st, 2009 Goto comments Leave a comment ARP Poisoning : Potential MITM attack Occasionally during security audits it may be necessary to check your LAN for rogue machines. All the potential rogue machine in your LAN needs to do is poison your ARP cache so that the cache thinks that the attacker is the router or the destination machine. Then all packets to that machine will go through the rogue machine, and it will be, from the network�s standpoint, between the client and the server, even though technically it�s just sitting next to them. This is actually fairly simple to do, and is also fairly easy to detect as a result. In this sample case, the rogue machine was in a different room but still on the same subnet. Through simple ARP poisoning it convinced the router that it was our server, and convinced the server that it was the router. It then had an enjoyable time functioning as both a password sniffer and a router for unsupported protocols. By simply pinging all the local machines (nmap -sP 192.168.1.0/24 will do this quickly) and then checking the ARP table (arp -an) for duplicates, you can detect ARP poisoning quite quickly. $ arp -an| awk '{print $4}'| sort | uniq -c | grep -v ' 1 ' 5 F8:F0:11:15:34:51 88 Then I simply looked at the IP addresses used by that ethernet address in �arp -an� output, ignoring those that were blatantly poisoned (such as the router) and looked up the remaining address in DNS to see which machine it was.

Below is a script I wrote to automate this process (perhaps in a cron job) , and send out an alert email if any ARP poisoning is detected. ARP Poisoning Check Script This can ideally run as a cronjob (i.e. 30 * * * *) #!/bin/sh # Star Dot Hosting # detect arp poisoning on LAN currentmonth=`date "+%Y-%m-%d %H:%M:%S"` logpath="/var/log" rm $logpath/arpwatch.log echo "ARP Poisoning Audit: " $currentmonth >> $logpath/arpwatch.log echo -e "-----------------------------------------" >> $logpath/arpwatch.log echo -e >> $logpath/arpwatch.log arp -an | awk '{print $4}' | sort | uniq -c | grep -v ' 1 ' if [ "$?" -eq 0 ] then arp -an | awk '{print $4}' | sort | uniq -c | grep -v ' 1 ' >> $logpath/arpwatch.log 2>&1 cat $logpath/arpwatch.log | mail -s 'Potential ARP Poisoning ALERT!' [email protected] else echo -e "No potential ARP poisoning instances found..." >> $logpath/arpwatch.log fi Simple! * * * * *

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n3tm@n May 1st, 2009 at 12:53 | #1 Reply | Quote pretty snazzy!

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