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 …
Not-So-Random: Using LD_PRELOAD to Hijack the rand() Function Read More »
Hello everyone. We’ve got another Boolean math session lined up for you today. This time we’re going to take a quick look at the NOT logic and examine how this one differs from the other operations. To review, Boolean math is based on a binary system where only two values exist. We can either have …
A little background… As I stood in front of a class of developers trying to explain cross-origin resource sharing (CORS), I knew I wasn’t conveying it well enough for a significant subset of the group. It was Autumn 2017 (not my password at the time, by the way), and I was on-site with one of …
Hello everyone. We’ve got another Boolean math session to look over today. Our focus this time will be on the XOR logic. The XOR stands for exclusive OR, and we will go over the details of what that means in just a moment. For those who are less familiar with Boolean logic, here is a …
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. …
Today we are going to take another look at some Boolean mathematics. In particular, we’re going to focus on the OR operational logic, as covered in Domain 3 of the CISSP common body of knowledge (CBK). As a brief recap, Boolean math is based on a binary system. As such, there are only two values …
Forward When talking about a proxy or a pivot or a tunnel, we could be talking about very different things. However, to me, these terms could mean the same thing too. A proxy could be considered a pivot, especially in ‘forward proxy’ mode, when it may be a corporate client’s only way to the internet …
Today we’re going to take a quick look at the AND Boolean logic, which is covered in Domain 3 of the CISSP common body of knowledge (CBK). To begin with, Boolean math is used to define the rules on how computer systems evaluate data. Because Boolean is based on a binary system, it only has …