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NetStumbler s primary weakness is that it relies on one form of wireless network detection, the Broadcast Probe Request Wireless equipment vendors will usually offer an option to disable this 80211 feature, which effectively blinds NetStumbler Other wardriving software available now, such as Kismet, also use this method but have other detection mechanisms to back them up if they fail That said, there is still no shortage of networks that can be detected by NetStumbler, and the feature to respond to a Broadcast Probe Request is still enabled by default for many vendors Another tool that may prove useful is Hotspotter Hotspotter can be utilized to find wireless hotspots or wireless networks; it, along with documentation, can be downloaded from http://wwwremoteexploitorg/downloads/hotspotter-04targz

11:

Popularity: Simplicity: Impact: Risk Rating: 8 7 9 8

Popularity: Simplicity: Impact: Risk Rating: 10 8 2 7

Kismet (http://wwwkismetwirelessnet) is a Linux- and BSD-based wireless sniffer that has war-driving functionality It allows you to track wireless access points and their GPS locations like NetStumbler, but it offers many other features as well Kismet is a passive network-detection tool that cycles through available wireless channels looking for 80211 packets that indicate the presence of a wireless LAN, such as Beacons and Association Requests Kismet can also gather additional information about a network if it can, such as IP addressing and Cisco Discovery Protocol (CDP) names Included with Kismet is a program called GPSMap, which generates a map of the Kismet results Kismet supports most of the wireless cards available for Linux and OpenBSD

A more quiet and subtle way of finding firewalls on a network is to use traceroute You can use UNIX s traceroute or NT s tracertexe to find each hop along the path to the target and do some deduction Linux s traceroute has the I option, which performs traceroutes by sending ICMP packets, as opposed to its default UDP packet technique

8:

[sm]$ traceroute -I 19216851100 traceroute to 19216851101 (19216851100), 30 hops max, 40 byte packets 1 attack-gw (1921685021) 5801 ms 5105 ms 5445 ms 2 gw1smallispnet (192168511) 3 gw2smallispnet (192168522) 13 14 15 hssibigispnet (10552012) serial1bigispnet (10552021) 19216851101 (19216851100)

Chances are good that the hop just before the target (10552021) is the firewall, but we don t know for sure yet We ll need to do a little more digging The preceding example is great if the routers between you and your target servers respond to TTL expired packets But some routers and firewalls are set up not to return ICMP TTL expired packets (from both ICMP and UDP packets) In this case the deduction is less scientific All you can do is run traceroute and see which hop responds last, and deduce that this is either a full-blown firewall or at least the first router in the path that begins to block TTL expired packets For example, here ICMP is being blocked to its destination, and there s no response from routers beyond client-gw smallispnet:

To use Kismet, you will first have to install the custom drivers required for monitormode operation This can vary depending on the chipset your card uses, but Kismet comes with a single way to enable all of them for monitor operation Before starting Kismet, run the kismet_monitor script to place your card into monitor mode Be sure you are in a directory that the Kismet user has access to before starting Kismet:

1 stoneface (1921681033) 12640 ms 8367 ms 2 gw1localispnet (17231101) 214582 ms 197992 ms 3 gw2localispnet (17231102) 206627 ms 38931 ms 4 ds1localispnet (1723112254) 47167 ms 52640 ms 14 ATM6LAX2BIGISPNET (105021) 250030 ms 391716 ms 15 ATM7SDGBIGISPNET (105025) 234668 ms 384525 ms 16 client-gwsmallispnet (10503250) 244065 ms !X * * 17 * * * 18 * * *

[root@localhost user]# kismet_monitor Using /usr/local/etc/kismetconf sources Enabling monitor mode for a cisco card on eth1 Modifying device eth1

EXAMPLE 14-7

Tracing Countermeasure U Route for traceroute information leakage is to restrict as many firewalls and routers The fix

This will place the wireless card configured in your kismetconf file into monitor mode Once Kismet is loaded, the interface will display any networks in range By default, Kismet will sort the networks in an Autofit mode that doesn t let you step through them Press S to bring up the Sort menu and then choose one of the available options; l (or latest time seen) works well in most cases The main window, shown next, displays the network name (SSID) The T column displays the type of network, W signifies whether or not WEP is enabled, and Ch stands for channel number The IP Range column shows any detected IP addresses found, either via ARP requests or normal traffic