So you’ve worked through the stack overflow. You’ve got EIP control. You’ve confirmed your shellcode executes cleanly in the lab. Then you take that exploit and point it at something compiled with modern protections — and it falls apart.

Welcome to ASLR.

What ASLR actually does

Address Space Layout Randomization is a memory protection mechanism that randomises where key components of a process — the stack, heap, and loaded modules — are placed in memory each time the application runs. The old approach to exploit development relied on hardcoded, predictable return addresses. ASLR makes those addresses unpredictable.

It doesn’t make exploitation impossible. It makes unreliable exploitation impossible — which is a meaningful distinction. If you can only get code execution 1 in 256 tries because you’re brute-forcing the randomisation, that’s not a reliable exploit. A reliable exploit accounts for ASLR properly.

That’s what this whitepaper covers.

What’s in the paper

This was originally written for the Infosec Institute — unpublished at the time, now available via the nullsecurity GitHub. It details multiple practical methods for bypassing ASLR when developing custom exploit code, covering the techniques that actually work against real software rather than artificial lab conditions.

If you’ve got the stack overflow basics down from Abusing the Stack and you’re ready to take on modern mitigations, this is the next step.

Download the full whitepaper here:

https://www.exploit-db.com/download/18744

Why this matters for aspiring pentesters

Most exploit development tutorials stop at the point where ASLR would break everything. That’s convenient for keeping tutorials simple, but it leaves you with a skewed picture of what real-world exploitation looks like.

Modern software almost universally ships with ASLR enabled. If your mental model of exploit development is based entirely on lab environments where protections are disabled, you’re going to hit a wall the moment you try to apply those skills anywhere that matters.

Understanding how to work around ASLR — whether that’s finding non-ASLR modules, leveraging information leaks, or building ROP chains — is what separates someone who can follow a tutorial from someone who can actually develop exploits. Read the paper, understand the techniques, and then go break something in the lab with protections enabled.

That’s where it gets interesting.