Linux

Hello World Payload

Linux X86 Assembly – How to Make Our Hello World Usable as an Exploit Payload

Overview In the last two tutorials, we built a Hello World program in NASM and GAS for x86 assembly.  While this can help us learn x86 assembly, it isn’t viable as a payload for use in exploits in its current form.  Today’s blog will look into what those issues are, how they impact the code’s …

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Linux X86 Assembly - How to Build a Hello World Program in NASM

Linux X86 Assembly – How to Build a Hello World Program in NASM

Overview A processor understands bytecode instructions specific to that architecture.  We as humans use mnemonics to make building these instructions easier than remembering a bunch of binary codes.  These mnemonics are known as assembly instructions.  This is one of the lowest levels of programming that can be done.  This programming is a bit of a …

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Solving the November 13th Detective Nevil Mystery Challenge

Solving the November 13th Detective Nevil Mystery Challenge

Overview Each week on Friday, we post a social media challenge known as “Detective Nevil Mystery Challenge”.  On November 13th of 2020, we released a challenge that contained a payload and it was only solved by one person on twitter.  That challenge is as follows: I decided it might be a good idea to do …

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LD_PRELOAD: Not-So-Random

Not-So-Random: Using LD_PRELOAD to Hijack the rand() Function

    Today I wanted to continue the series on using LD_PRELOAD.  In today’s post we are going to use LD_PRELOAD to hijack the rand() function in a simple random number guessing game to control the generation of random numbers and effectively be able to cheat in this simple game by making it extremely predictable.  The code …

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LD_PRELOAD – Introduction

    Today I wanted to start what I plan to be a small series of blog posts about LD_PRELOAD. LD_PRELOAD is related to Linux based systems and revolves around the loader system and how shared object libraries resolve linker symbols when loading a dynamically linked ELF binary and is loaded before any other shared object libraries. …

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