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Hacker anywhere in the world PDA being used at a public Wi-Fi hotspot IP address: 70.223.x.x
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1. Hacker scans hundreds of thousands of IP addresses looking for live hosts
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2. Hacker finds PDA with 70.223.x.x IP address and can now perform a direct attack
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Figure 1.3: Finding a target
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Another method for finding a device is to identify the signals being emitted from the device. Bluetooth is a good example of this. If a Bluetooth-enabled device is in use, a Bluetooth-sniffing tool can find and identify that signal. Once discovered, all types of bad things can be done to exploit the device. I will cover Bluetooth exploitations in detail later in this book. I ve covered how devices can be discovered, but what can be done to devices once they are found This depends on the particular device and the technologies the device is using. Examples of things that can be done include
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Removing data from the device Altering data on the device
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Understanding the Threats and Devices
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Uploading data (including malware) to the device Modifying the device s configuration Utilizing the device in an unauthorized manner Rendering the device useless
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Figure 1.4 illustrates the different direct attack threats to a mobile device. Neither of the examples in the figure bodes particularly well for enterprises. In later sections of this book, specific examples of direct attacks will be illustrated, as will specific applications and actions that can be taken to protect the devices. In a general sense, the following tactics can protect mobile devices from direct attack:
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Personal firewalls can prohibit unauthorized access, as well as help devices become stealthier to avoid detection. The latest operating system and application antivirus updates will remove vulnerabilities, preventing direct attacks from taking advantage of ones that may not be present if the proper updates are installed. A secure configuration can leave fewer exploits open.
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Figure 1.4: Examples of direct attacks
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Understanding the Threats
Data-Communication Interception
Sometimes the easiest and best means of attacking a device is indirect. Many devices are now capable of connecting to other devices and networks. Often these devices can connect via a number of methods. It s this communication that can be hacked and used for malicious intent. One quick trip to an electronics store will yield a plethora of devices capable of connecting via Wi-Fi, EvDO and other 3G (third-generation) technologies, infrared, and so on. Enterprises are challenged to get their hands around these different types of connectivity and ensure that these connections are secure and that the info being transmitted over these devices is secure and encrypted. Believe it or not, there are still enterprises out there that do not allow their mobile laptop devices to utilize wireless technology. They view Wi-Fi as simply too dangerous and too difficult to secure. But these companies really don t have a good way to stop their laptops from utilizing Wi-Fi it s a written policy that they have no way to enforce. When it comes to nontraditional mobile devices such as PDAs, the threat is largely ignored. As stated previously, mobile devices need at least the same protection as desktop and laptop computer systems. The fact that enterprises will attempt to prohibit Wi-Fi on laptops and have no strategy for PDAs and other devices is quite disturbing. These mobile devices will be used with no enterpriseprovided protection or strategy, but they contain the same data and perform the same functions. This is explicitly true when it comes to data-communication threats. A good way to protect a laptop or desktop computer that utilizes Wi-Fi is to implement WPA2 (Wi-Fi protected access 2) technology. That way, there is authentication to the wireless network that is encrypted and the data being transmitted and received is encrypted as well. Companies implement this technology on their wireless LANs, though 802.1x technology generally isn t used at public Wi-Fi hotspots. One good way to address this with mobile laptops is to ensure via technology not written policy that VPN tunnels are up and running when the laptop is connected via wireless. With split-tunneling disabled, all communication leaving that interface will be forced to go through the VPN tunnel and be encrypted, commonly with IPSec via 3DES or AES, or via SSL. This is a good approach, but not rarely thought of with mobile devices. When mobile devices connect to public Wi-Fi hotpots, enterprises generally ignore the threat and pretend there really isn t any of their data being transmitted from mobile devices over unprotected wireless networks. Clearly, not admitting there is a problem doesn t make it go away. Without question, mobile workers will use their PDAs and other devices for tasks such as checking email and sending instant messages. As with a laptop, this information can be easily