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One of the earliest attempts at securing WLANs was to implement MAC address filtering This simple technology used a list of MAC addresses that are allowed to authenticate with the AP or a list of MAC addresses that are not allowed to authenticate Figure 9-6 shows a typical configuration interface for this feature The feature is based on the fact that all 80211 WLAN NICs have a physical address known as the MAC address This address is either encoded into a NIC or is stored as a configuration parameter The MAC address is normally read from hardware by the NIC device driver, but the device driver can be instructed to ignore what was read from the NIC hardware and to use a different address The problem is that, since many devices have a MAC that is specified as a configuration parameter, MAC addresses can be spoofed (faked or stolen) If an attacker can discover a valid
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FIGURE 9-6
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MAC address, he can easily change the MAC address of his NIC to match Figure 9-7 shows the Device Manager interface for changing a MAC address, which is available for many different WLAN devices In addition to the built-in interface of many WLAN NICs, you can utilize applications like SMAC (shown in Figure 9-8) to change the MAC address of your WLAN card SMAC works with almost any NIC, wired or wireless Using simple eavesdropping tools like CommView for WiFi or OmniPeek Personal, an attacker can quickly determine the MAC address of users who are associated with your AP If they are associated, their MAC addresses must be in the allowed list All that the attacker has to do now is configure his MAC address and then authenticate and associate with the AP This simple hack is why MAC filtering should not be considered a security solution at all It may be considered a configuration enforcement solution of sorts, but it should not be considered a security solution in any way
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FIGURE 9-8
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Identify and Describe WLAN Security Techniques
A common response to the reality of scenarios like this is, The attacker would have to have the right WLAN card to work with these eavesdropping tools, wouldn t he The answer is an affirmative one, but remember that attackers can pick up equipment at eBay now for very little cost
Peer-to-Peer Attacks
A peer-to-peer attack occurs anytime one WLAN client station attacks another WLAN station that is associated with the same AP Hijacking attacks are sometimes referred to as peer-to-peer attacks as well These types of attacks must be protected against, as they are usually malicious No real reason exists for an attacker to gain access to another peer computer other than theft or damage Attackers may desire to penetrate your network in order to use it to gain access to the Internet That is often their single intent When an attacker tries to gain access to a client station on your network, he is not likely to be doing it for Internet access Instead, he is likely to be performing a data theft or destruction attack He may be attempting to install back doors into your network or other malicious software Whatever his intention, it is seldom going to be benign To understand the potential severity of a peer-to-peer attack, consider the data that is often held on a user s laptop Many users have personal information on their laptops as well as information belonging to the organization The personal information may include account names and passwords for online banking and other sensitive systems that the users access The organization s information can include anything the users have at least read access to on the network Users will often copy this information to the hard drive of their laptops so that they can view the information while traveling Many times the users are traveling through airports, which is just such a place where peer-to-peer attacks are likely to occur You can protect against these types of attacks using two common methods: endpoint security solutions or Public Secure Packet Forwarding (PSPF) Endpoint security involves the installation of an application on your WLAN clients that monitors and reports on any attempts made by other client stations to access the monitored client Such software may be bundled in with anti-spyware or antivirus software PSPF is a Cisco technology that allows you to disable access to WLAN client stations by other stations associated with the same AP or even the same ESS Other vendors offer similar functionality, though they may call it by a different name Figure 9-9 illustrates the concept of a peer-to-peer attack Notice that the malicious file is passing through the AP This is normally the only way one station can communicate with another station in an infrastructure BSS If station-to-station
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