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If you don t care what order they re in, it s possible to read those bits as bits and not as files of text or numbers. Human beings can t read bits in this way, but software and hardware devices are available that can scan storage media and read the bits. These tools bypass the OS and grab the raw bits of data, which can then be reconstructed into the original files. In fact, an entire industry has been built on the concept of reading bits as bits, a process called data recovery. When you have a system crash or some kind of physical damage to a hard drive, you can take your computer to a data recovery expert, who often can reconstruct the files on the disk. These companies provide a valuable service, helping to prevent total losses in the event of a natural disaster or computer failure. Reynolds Data Recovery of Longmont, Colorado, performs data recovery and also sells software that allows you to perform your own recovery (see Figure 1-3). According to the company s advertising, one of its products, Inspector Copier, does not reference the OS installed on the devices, [and] this allows copies of different systems such as NT, Novell, UNIX, Linux or Windows 2000!
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Figure 1-3 Inspector Copier from Reynolds Data Recovery (courtesy of Mark Tessin of Reynolds Data Recovery)
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But the techniques of data recovery can also be used by attackers to circumvent OS protections. To extend Inspector Copier, Reynolds sells a network backup service that remotely backs up data on hard drives. It uses Inspector Copier to extract the bits so that even if a hard drive is damaged, a clean backup can be made. Although this service can be valuable to many companies, it also means that the data recovery program can be run remotely. Mark Tessin of Reynolds points out that the service can even circumvent Windows NT security. Suppose your PC is connected to a network but you don t want the outside world to see your C: drive. You can set the permissions on your drive so that only you have read or write permission to it (see Figure 1-4). The Reynolds network backup service can circumvent that permission and read the files anyway. This is not to imply that Reynolds Data Recovery will steal your data, only to illustrate that it is possible.
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Figure 1-4 Setting network permissions on a local drive using Windows NT
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For serious disk drive failures (such as fire damage), data recovery might be possible only through specialized hardware devices. But an attacker is not trying to steal your data from a damaged drive. Data recovery software is so sophisticated and effective that it s all anyone needs to extract bits from a healthy storage medium. To ensure the security of your data, you must assume that even though some protections may be sufficient against some opponents, there will likely be someone out there with the resources to mount a successful attack. Only if such an individual never comes after your data are you safe.
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Often, sensitive material is not stored on hard drives but does appear in a computer s memory. For example, when the program you re running allocates some of the computer s memory, the OS tags that area of memory as unavailable, and no one else can use it or see it. When you re finished with that area of memory, though, many operating systems and programs simply free it marking it as available without overwriting it. This means that anything you put into that memory area, even if you later deleted it, is still there. A memory reconstruction attack involves trying to examine all possible areas of memory. The attacker simply allocates the memory you just freed and sees what s left there. A similar problem is related to what is called virtual memory. The memory managers in many operating systems use the hard drive as virtual memory, temporarily copying to the hard drive any data from memory that has been allocated but is momentarily not being used. When that information is needed again, the memory manager swaps the current virtual memory for the real memory. In August 1997, The New York Times published a report about an individual using simple tools to scan his hard drive. In the swap space, he found the password he used for a popular security application. On UNIX systems, the OS dumps core in response to certain system errors. Core dump has become almost synonymous with a program exiting ungracefully. But on UNIX, the core file that results from a core dump is actually a snapshot of memory at the time the error occurred. An attacker who wants to read memory may be able to induce a core dump and peruse the core file.
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