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Use Strong Input Validation The right approach to input validation is to check input against a ist of known good values Good input validation does not attempt to check for specific bad values It s like having an invitation-only party If you want to make sure only invited guests get in, make a guest list and check against it at the door Don t try to make a list of all the people who aren t invited Checking against a list of known good values is called whitelisting When the set of possible input values is small, you can use indirect selection to make the whitelist impossible to bypass Indirect selection is at the top of the heap when it comes to input validation At the bottom of the heap is blacklisting: attempting to enumerate all the possible unacceptable input Indirect Selection In general, the less leeway an attacker has to provide unexpected input to the program, the better For that reason, the best way to validate input is with a level of indirection: Create a list of legitimate values that a user is allowed to specify, and allow the user to supply only the index into that list Now, instead of validating a potentially complex piece of input, the program only needs to check to make sure that the user supplies a legitimate index With this known good approach, application logic never directly uses input the user provides This form of input validation isn t always practical, but it is ideal for situations in which a user is selecting from among a list of choices Use selection values that cannot be easily mistaken for the data they protect This will eliminate any later temptation to use the values directly Example 59 gives a program that limits access to old UNIX-style games By funneling would-be gamers through a launcher program, access to games on the system is controlled centrally Of course, such programs should expect to come under a variety of attacks, ranging from attempts to gain unauthorized access to efforts designed to use the launcher program to modify protected saved game files The program works by reading the name of the game from standard input Note that the indirect selection does not permit the user to specify a full path to the executable, so any future attempt to use the input directly will likely cause the program to fail. vb.net code 128 reader VB . NET Barcode Reader - How to Scan & Read Barcode in VB . NET ...
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NET demos. stored on the heap, and attackers have also found ways to change the control ow of the program For example, they might overwrite the value of a function pointer so that when the program invokes the function referenced by the function pointer, it will execute malicious code Finally, even if an attacker cannot inject malicious code onto a system, an exploit technique known as arc injection or return-into-libc (because of its dependency on standard library functions) might allow a buffer over ow to alter the control ow of the program Arc injection attacks use a buffer over ow to overwrite either a return address or the value of a function pointer with the address of a function already de ned on the system, which could allow an attacker to set up a call to an arbitrary system library, such as system("/bin/sh") [Pincus and Baker, 2004] Enough is enough Buffer over ow vulnerabilities give an attacker a lot of latitude Writing just a single byte past the end of an array can result in system compromise In the rest of this chapter, we spend very little energy discussing exploitability Instead, we talk about common mistakes and how to identify them, remediate them, and hopefully avoid them altogether Buffer Allocation Strategies Most tactics for preventing buffer over ows focus on how and when to check for a ondition that will lead to an over ow Before we discuss these tactics, we consider what should happen when such a check fails At its core, this is a question of memory allocation There are only two alternatives; when an operation requires a larger buffer than is currently allocated, the program can do one of two things: Retain the current size of the buffer and either prevent the operation from executing (perhaps by doing something as extreme as terminating program execution) or carry out only part of the operation (thereby truncating the data) Dynamically resize the buffer so that it can accommodate the results of the operation Big programs invariably use static allocation in some cases and dynamic allocation in others Programmers choose between them based on the task at hand Regardless of the approach being used for a particular piece of code, a systematic and explicit method for memory allocation makes it easier for a human or a tool to inspect the code and quickly verify its safety Be consistent with the solution you choose for speci c types of operations. 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