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Fuzz testing is a technique used to determine how a program reacts to invalid input data A simple approach would be to use a hex editor to change the file format of a data file used by a program for example, modifying the bits in a doc file used by Microsoft Word In practice, the process is nearly always much more methodical Rather than randomly changing data, fuzz tests usually involve manipulating the data in a manner that exposes a potential security issue such as an exploitable buffer overrun Fuzz testing is equally applicable to database testing, protocol testing, or any other situation where part of a system or application must read and interpret data Finding Fuzzing Holes During Windows Vista development, I oversaw the file fuzzing tests on the Microsoft Windows Shell (user interface).

This command line uses the output of Help as the input for More. The More command filters out the first screenful of Help output, sends it to the screen as its own output, and then waits for a keypress before sending more filtered output. The Command Combination Symbols Windows Vista allows you to enter multiple commands on a single command line. Furthermore, you can make later commands depend on the results of earlier commands. This feature can be particularly useful in batch programs and Doskey macros, but you might also find it convenient at the command prompt. To simply combine commands without regard to their results, use the & symbol:

The most difficult part of this problem was not creating and executing the fuzz tests, but identifying all of the different ways that the Shell can parse files The Shell is extensible by nature, and many teams across Windows extend it to improve the user experience of dealing with files in Windows Explorer The sheer quantity of file parsers and cross-organizational code ownership creates a high likelihood of test holes We realized this, and to address it we authored a very detailed test plan based on categories of parsers (that is, property handlers, shell folders, thumbnail extractors, and so forth) and compiled lists of things to test based on a meticulous hand audit of the code Even though we reviewed our data with architects and test leaders across the organization, we fully expected to miss things.

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Thus, we began watching the bug database for any crashes, hangs, or memory spikes in the Shell that originated from malformed files Late in the Windows Vista cycle, we discovered a bug that had come out of ad hoc testing with corrupted files Of course, we immediately researched this issue to understand why our extensive fuzzing effort had not flushed this out We discovered a fuzzing hole in one of our cross-team-owned property handlers! The root cause was an instance of incorrect assumptions: The owning feature team assumed the APIbased file fuzz testing they had done provided full coverage of their property handler, but in fact, they had some small amount of code that was not covered by fuzzing of the underlying APIs.

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object being constructed . The reason is if the virtual method is overridden in the type being instantiated, the derived type s implementation of the overridden method will execute, but all of the fields in the hierarchy have not been fully initialized . Calling a virtual method would therefore result in unpredictable behavior .

Alarmed at the prospect of more serious security issues lurking in this unfuzzed code, we quickly spun up a cross-team effort to provide the fuzzing coverage we had missed This particular component parsed several unique file types Two of us used a lab of computers and spent a week doing execution tests to close this hole completely The fuzzing of this component eventually yielded six crashing bugs, all of which were fixed before release Eric Douglas, Senior Test Lead.

Run These Programs At User Logon Do Not Process The Run Once List Do Not Process The Legacy Run List

Func<Object, ArgumentException> fn1 = null;