Why is everyone concentrating on MAC filtering..... MAC filters are just a front line first wave deterrent. Yeah anyone can go download sirMacsalot and spoof their MAC easily. The key is that wireless equipment should not be trustedI placed mine outside the firewall, so users must use the VPN to get in, because I trust Firewall/VPN equipment 1000 times more than any wireless equipment
-----Original Message----- From: Adam Powers [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 28, 2007 9:41 AM To: [EMAIL PROTECTED]; Adam Graham; [EMAIL PROTECTED]; [EMAIL PROTECTED] Com Subject: Re: Wired detection of rogue access points "Filtering by MAC gives you no additional security whatsoever, period" Meh, this is simply not true. My home AP might is plenty secure from my SOHO technology noob neighbors with MAC filtering - few, if any, of them even know what an "AP" is much less "MAC spoofing". Having said that filtering technologies such as MAC filtering are far too difficult to manage given the relatively small security return provided and as such should be avoided given the fact that other superior authentication and access control mechanisms exist. On 3/26/07 7:24 PM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > Filtering by MAC gives you no additional security whatsoever, period. MAC > addresses can be easily spoofed and although your solution may assist in > spotting misconfigurations a determined intruder will get straight through.... > > Sent from my BlackBerryR wireless device > > -----Original Message----- > From: "Adam Graham" <[EMAIL PROTECTED]> > Date: Mon, 26 Mar 2007 15:52:21 > To:<[email protected]> > Subject: RE: Wired detection of rogue access points > > First off is it even possible to buy a laptop that does not have wifi built > in? > > I have set up an automated scan looking for MACs. If the MAC does not appear > on my list I drop its packets in the IPTabes FW. It's rather simple to do. > The main thing I do that seems to work the best is the APs are un-trusted > and therefore stuck out in the DMZ. Before one can get to network resources > they need to open the VPN client after connecting to the AP. > > A simple way to handle MACs with IPTables (NOTE: simple rule if you need > more instruction I can send it to you or just the complete iptable script): > > Let's create 2 text files: > /tmp/whiteist > /tmp/blackist > > Insert into whiteist 00:06:25:2E:56:A0 > Insert into blackist 00:06:25:2E:56:E1 > > > Add following to your IPTabes script > TABLES = "filter nat mangle" > iptables = /sbin/iptables > touch /tmp/whiteist > touch /tmp/blackist > WHITELIST = `cat /tmp/whiteist | awk '{print $1}' > BLACKLIST = `cat /tmp/blackist | awk '{print $1}' > > # Forward good MACs > $iptables -t filter -I FORWARD 1 -m mark --mark 0x42 -j ACCEPT > > # mark all packets from the good macs > for MAC in $WHITELIST ; do > $iptables -t mangle -I PREROUTING -m mac --mac-source $MAC -j MARK > --set-mark 0x42 > done > > # drop all packets from the good macs > for MAC in $BLACKLIST ; do > $iptables -t mangle -I PREROUTING -m mac --mac-source $MAC -j DROP > done > > > > > > ------------------------------------------------------------------------ > Test Your IDS > > Is your IDS deployed correctly? > Find out quickly and easily by testing it > with real-world attacks from CORE IMPACT. > Go to > http://www.coresecurity.com/index.php5?module=Form&action=impact&campaign=in tr > o_sfw > to learn more. > ------------------------------------------------------------------------ > -- Adam Powers Chief Technology Officer Lancope, Inc. c. 678.725.1028 e. [EMAIL PROTECTED] __________ NOD32 2148 (20070327) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com ------------------------------------------------------------------------ Test Your IDS Is your IDS deployed correctly? Find out quickly and easily by testing it with real-world attacks from CORE IMPACT. Go to http://www.coresecurity.com/index.php5?module=Form&action=impact&campaign=intro_sfw to learn more. ------------------------------------------------------------------------
