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Year ago, Windows introduced “ code pages” to accomplish string encoding by mapping ASCII and international language character sets to specific code values (e.g., A=41, B=42, etc) and storing them in individual pages. This post is pretty long so here are some quick links to help you navigate: I also recommend you check out some of my prior tutorials to ensure you have a solid understanding of exploit basics (registers, the stack, memory layout, etc), how buffer overflow attacks work, SEH-based exploits and jumping techniques. Phrack: Building IA32 ‘Unicode-Proof’ Shellcodes.Creating Arbitrary Shellcode In Unicode Expanded Strings.Practical Win32 and Unicode Exploitation.FuzzySecurity: Part 5: Unicode 0x00410041.Corelan Team: Exploit writing tutorial part 7 : Unicode – from 0×00410041 to calc.Use of Unicode and Character Sets in Windows : MSDN reference on ANSI and Unicode.
Windows via C/C++: A great all-around reference for Windows programming, the first chapters of this book cover working with strings in the Windows environment.While I’m going to cover several topics and provide multiple examples, it’s always beneficial to have other reference material when learning a new topic here are some that I recommend: A scripting language (I’ll use Perl for these demos).A Windows environment (XP or Win 7 - my demos will be on the latter).If you plan on following along, I recommend you have the following: We’ll start with a brief introduction to Unicode (what it is and why/how it’s used in Windows) and then jump right in to some example exploits. In this seventh installment of the Windows Exploit Development Series, I’ll introduce Unicode Buffer Overflows.
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