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this book are focused exclusively on offline code analysis, not on live analysis This means that you ll primarily just read assembly language listings and try to decipher them, as opposed to running programs in the debugger and stepping through them Even though in many cases you ll want to combine the two approaches, I ve decided to only use offline analysis (dead listing) because it is easier to implement in the context of a written guide I could have described live debugging sessions throughout this book, but they would have been very difficult to follow, because any minor environmental difference (such as a different operating system version of even a different service pack) could create confusing differences between what you see on the screen on what s printed on the page.

The benefit of using dead listings is that you will be able to follow along everything I do just by reading the code listings from the page and analyzing them with me In the next few chapters, you can expect to see quite a few longish, uncommented assembly language code listings, followed by detailed explanations of those listings I have intentionally avoided commenting any of the code, because that would be outright cheating The whole point is that you will look at raw assembly language code just as it will be presented to you in a real reversing session, and try to extract the information you re seeking from that code I ve made these analysis sessions very detailed, so you can easily follow the comprehension process as it takes place.

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express reduced variables R R R Q Q Q = Q R = If R and Q are uncorrelated, Equation (13.1) for the margin of safety becomes M = R Q = R R Q Q + R Q = 0 (16.23)

2

The disassembled listings in this book were produced using more than one disassembler, which makes sense considering that reversers rarely work with just a single tool throughout an entire project Generally speaking, most of the code listings were produced using OllyDbg, which is one of the best freeware reversing tools available (it s actually distributed as shareware, but registration is performed free of charge it s just a formality) Even though OllyDbg is a debugger, I find its internal disassembler quite powerful considering that it is 100 percent free it provides highly accurate disassembly, and its code analysis engine is able to extract a decent amount of high-level information regarding the disassembled code..

There are many possible ways of dealing with buffer overflow bugs. The first and most obvious way is of course to try to avoid them in the first place, but that doesn t always prove to be as simple as it seems. Sure, it would take a really careless developer to put something like our poor launch in a production system,

(16.22)

but there are other, far more subtle mistakes that can create potential buffer overflow bugs. One technique that aims to automatically prevent these problems from occurring is by the use of automatic, compiler-generated stack checking. The idea is quite simple: For any function that accesses local variables by reference, push an extra cookie or canary to the stack between the last local variable and the function s return address. This cookie should then be validated before the function returns to the caller. If the cookie has been modified, program execution immediately stops. This ensures that the return value hasn t been overwritten with some other address and prevents the execution of any kind of malicious code. One thing that s immediately clear about this approach is that the cookie must be a random number. If it s not, an attacker could simply add the cookie s value as part of the overflowing payload and bypass the stack protection. The solution is to use a pseudorandom number as a cookie. If you re wondering just how random pseudorandom numbers can be, take a look at [Knuth2] Donald E. Knuth. The Art of Computer Programming Volume 2: Seminumerical Algorithms (Second Edition). Addison Wesley, but suffice it to say that they re random enough for this purpose. With a pseudorandom number, the attacker has no way of knowing in advance what the cookie is going to be, and so it becomes impossible to fool the cookie verification code (though it s still possible to work around this whole mechanism in other ways, as explained later in this chapter). The following code is the same launch function from before, except that stack checking has been added (using the /GS option in the Microsoft C/C++ compiler).

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