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When access controls are configured based on IP addresses vs. network security policies, access attacks can occur. Spoofing, or the act of masquerading around on a network with a valid IP address that was not legitimately given, is one of these access attacks and is a common way for attackers to establish access. To spoof an IP or MAC address, an attacker need only discover the MAC address or IP address of someone they know can access a network and then change their MAC address to the MAC address that the network is familiar with. Let s take a command-line look at how to change your MAC address. First run an ifconfig command to get your current MAC address. Then, use the lladdr option of ifconfig to change your MAC address slightly. ifconfig en0 en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 00:17:f2:2a:66:12 cedge:/Users/cedge root# sudo ifconfig en0 lladdr 00:17:f2:2a:66:21 cedge:/Users/cedge root# ifconfig en0 en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 00:17:f2:2a:66:21 For any application that is blocking traffic from your machine based on its MAC address, the traffic will now be allowed. Once a machine on a network changes its MAC address, other machines will see this change and issue a line similar to the following: kernel: arp: 192.168.55.108 moved from 00:17:f2:2a:66:12 to 00:17:f2:2a:66:21 on eth0 Armed with this information, you can now set up a scanner in your logs to be notified when this line appears and then investigate all changes of MAC addresses. One way to get around this type of attack is by redirecting the access to other sentry machines that are set up to monitor these kinds of spoofing attacks. This is a deceptive active response to fool attackers into thinking attacks are succeeding, allowing an administrator to monitor the activity of the attack. If you are running Snort/HenWen with the Guardian plug-in, discussed further in 14, then your system should notice the MAC spoof and disable communications from that host automatically, thus defending you against an attack from a spoofed IP address.
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CHAPTER 7 SE CURING N ETWORK TRA FFIC
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Using stateful packet inspection (SPI), a firewall appliance holds the significant attributes of each connection in memory. These attributes, collectively known as the state of the connection, include such details as the IP addresses and ports involved in the connection and the sequence of packets traversing the connection. The most CPU-intensive checking is performed at the time of the start of the connection. All packets after that (for that session) are processed rapidly because it is simple and fast to determine whether they belong to an existing, prescreened session. Once the session has ended, its entry in the state table is discarded. Most modern firewalls, including those in some Linksys and Netgear routers found at your local consumer electronics store, will have basic SPI features, as does the OS X Leopard software firewall. Appliances have a limited amount of memory and cannot inspect as many packets as rapidly or as closely as a more advanced device, such as some CheckPoints, SonicWalls, or Ciscos. Typically, SPI on these firewalls will check only the source of the packet against the source defined in the header. Deep packet inspection (DPI) is a subclass of SPI that examines the data portion of a packet and searches for nonprotocol compliance, or some predefined pattern, in order to decide whether the packet is allowed to pass through the device performing the inspection. This is in contrast to shallow packet inspection (or more simply packet inspection), which checks just the header portion of a packet. DPI classifies traffic based on a signature database (as does SPI) and will allow you to redirect, mark, block, rate limit, and of course report based on the classification. Many DPI devices can also identify flows rather than rely on signature-based packets by packet inspection. This allows devices to detect newer attacks rather than react to predefined attacks, giving more security to the environment. If your environment has the budget to acquire a firewall with DPI as a feature, heavily consider putting one into your network environment. For the security it provides, it is well worth the investment.
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