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Prevention Although detection of ping sweep activity is critical, a dose of prevention will go even further We recommend that you carefully evaluate the type of ICMP traffic you allow into your networks or into specific systems There are many different types of ICMP traffic ECHO and ECHO_REPLY are only two such types Most routers do not require all types of ICMP traffic to all systems directly connected to the Internet Although almost any firewall can filter ICMP packets, organizational needs may dictate that the firewall pass some ICMP traffic If a true need exists, you should carefully consider which types of ICMP traffic you allow to pass A minimalist approach may be to only allow ICMP ECHO_REPLY, HOST_UNREACHABLE, and TIME_EXCEEDED packets into the DMZ network and only to specific hosts In addition, if ICMP traffic can be limited with access control lists (ACLs) to specific IP addresses of your ISP, you are better off This will allow your ISP to check for connectivity, while making it more difficult to perform ICMP sweeps against systems connected directly to the Internet ICMP is a powerful protocol for diagnosing network problems, but it is also easily abused Allowing unrestricted ICMP traffic into your border gateway may allow attackers to mount a denial of service attack, bringing down a system or affecting its availability Even worse, if attackers actually manage to compromise one of your systems, they may be able to back-door the operating system and covertly tunnel data within an ICMP ECHO packet using a program such as loki2 For more information on loki2, check out Phrack Magazine (http://wwwphrackorg) Another interesting concept is pingd, which was developed by Tom Ptacek and ported to Linux by Mike Schiffman pingd is a userland daemon that handles all ICMP ECHO and ICMP ECHO_REPLY traffic at the host level This feat is accomplished by removing support of ICMP ECHO processing from the kernel and implementing a userland daemon with a raw ICMP socket to handle these packets Essentially, it provides an access control mechanism for ping at the system level pingd is available for Linux at http://packetstormsecurityorg/UNIX/misc/pingd-051tgz.

The nice thing about checking for null passwords is that each attempt to discover null passwords does not create a failed login entry, unlike attempting to log in Chknull can easily scan for blank passwords and passwords set as the username As you can see in the following illustration, numerous users have no password set and one user, JBENSON, has a password of JBENSON tsk, tsk, tsk

2:

Chknull s last option (to supply passwords on the command line) doesn t always work and should not be relied on

.

If you are having problems with chknull enumerating the wrong server, be sure to check your Set Primary selection You can do this with the NetWare Connections window

Wireless networks and access points (APs) are some of the easiest and cheapest types of targets to footprint (or war-drive ) and, ironically, some of the hardest to detect and investigate War-driving once was synonymous with the simple configuration of a laptop, a wireless card, and Network Stumbler (or NetStumbler, http://wwwstumbler net/) Now it is a much more sophisticated setup that can utilize multiple types of highpowered antennas, wireless cards, and palm-sized computing devices, including the ever-popular personal digital assistant (PDA) devices such as the HP iPAQ and Palm We use the term war-driving loosely in the realm of the hacking methodology and footprinting mainly because you do not have to be driving You may walk around a technology park, downtown area, or simply through the halls of your own building with your laptop if you are performing an internal audit Footprinting wireless devices, particularly APs, starts with the simple task of locating them via the passive method of listening for AP broadcast beacons or the more aggressive method of transmitting client beacons in search of AP responses Understand that all WLAN footprinting can be done remotely as long as you are in range to transmit and receive beacons and packets to and from the AP With this said, a huge advantage would be to have a better antenna than what usually comes with the card you purchase As you will see, the proper equipment makes all the difference in footprinting a WLAN Numerous types of wireless cards exist, with different chipsets Some allow you to put the card in promiscuous mode (that is, to listen or sniff the raw traffic from the air), and others will not Likewise, certain cards inherently work better because they provide support for different operating systems Antenna strength and direction are also equipment factors You may want to use an omnidirectional antenna if you are just driving through crowded streets, or you can use a directional antenna if you re targeting a specific building, location, or AP Oh yes, let s not forget about the global positioning system (GPS) GPS will prove to be a wonderful addition to your equipment list if you wish to track APs, monitor their transmitting range, and potentially retest them in the future.

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