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Reviewing Assembly
Assembly is a language I’ve dabbled in for years, but never really pressed myself to become fluent in. I understand the basics of memory layout and the general idea of how to program in assembly, but...
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Reviewing Debugging with gdb
As you may have noticed, I’m preparing to become an OSCP. In addition to brushing up on assembly, I’ll also be stepping through the debugger. Let’s review gdb and go over some tips to make sure the...
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Data Types and Moving Data in Assembly
I’m still following the Assembly Primer for Hackers from Vivek Ramachandran of SecurityTube in preparation for Penetration Testing with BackTrack. In this review I’ll cover data types and how to move...
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Comparing Strings in Assembly
As part of my quest to improve my assembly skills I’ve been reviewing Vivek Ramachandran’s Assembly Primer for Hackers. I’ve nearly completed the series and I thought I would try out some of what I...
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Comparing Strings in Assembly Part 2
Earlier today I wrote some assembly code to compare 2 strings and print out whether or not they were equal to one another. I’ve been learning more assembly and so I thought I would tweak it a bit to...
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Examining the Stack to Debug Segfaults with gdb
Earlier, while writing my compare strings method, I made a mistake in the code and came across a segmentation fault. Based on how the program executed I was pretty sure of approximately where the error...
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Examining a Buffer Overflow in C and assembly with gdb
Welcome University of Maryland students! Thanks for visiting! I’ve now finished Vivek Ramachandran’s Assembly Primer for Hackers and I’ve decided to move on to his Buffer Overflow Primer. I’ve...
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Testing Shellcode on a Non-Executable Stack or Heap
If you’re learning about buffer overflows and shellcode, chances are you’re exploiting some stack-based vulnerabilities. If you’re like me you might also find that when you compile your programs they...
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