Security Sift

Introduction A while back I introduced the EggSandwich in my tutorial on Egghunting as a means to implement some basic integrity checks into the traditional Egghunter and overcome the problem of fragmented / corrupted shellcode. I recently took the opportunity to update my implementation so it could accomodate shellcode of any size. The code and a brief explanation follows. What is the EggSandwich? I ran into a situation when developing an exploit for an…

Overview In Parts 2 and 3, we built and improved upon an exploit for ASX To MP3 converter. Even though it had it’s flaws, as far as exploits go, it was pretty straightforward — direct EIP overwrite with a jump directly to a register that pointed to our shellcode. Things aren’t always that easy. Quite often you have to do a bit more work to get the application to execute…

Overview Welcome to Part 1 of a series of posts on Windows Exploit Development. In this first installment I’ll cover just the basics necessary to understand the content of future posts, including some Assembly syntax, Windows memory layout, and using a debugger. This will not be a comprehensive discussion on any of these topics so if you have no exposure to Assembly or if anything is unclear after you read…