Neon Exploits: Breaching the Data Veil with a UNION Injection

The city never sleeps—but neither do its systems. Beneath the glow of holographic ads and the hum of server racks, applications whisper secrets to anyone who knows how to listen. In this lab, we step into the role of a digital ghost, slipping through a vulnerable product category filter and bending SQL queries to our will.

The Entry Point: A Flawed Filter

Every system has a weakness. Here, it’s the product category filter—a seemingly harmless feature that lets users browse inventory. But under the hood, it’s wired directly into a SQL query without proper sanitization. That’s where the crack in the armor lies.

The application reflects query results back in its response, which is exactly what we need. This isn’t just a passive leak—it’s an invitation.

Weapon of Choice: UNION Injection

To move laterally through the database, we deploy a UNION-based SQL injection. Think of it as splicing two data streams together: the legitimate query and our malicious payload.

But this isn’t brute force. Precision matters.

We first determine:

  • The number of columns returned by the original query
  • Which columns can display text data in the response

Once mapped, we craft a UNION SELECT statement that aligns perfectly with the original query structure. No alarms. No crashes. Just seamless data extraction.

Target Acquired: The users Table

Buried deeper in the database is a table called users. It holds two critical columns:

  • username
  • password

The keys to the kingdom.

By injecting a UNION query that selects these columns, we redirect the application’s response to reveal credentials instead of product data. The interface doesn’t know the difference—it simply renders what it’s given.

And just like that, the veil lifts.

The Final Move: Becoming Admin

Among the harvested credentials lies the administrator account. With username and password in hand, logging in is trivial.

No exploits. No bypasses. Just authentication—using the system’s own trust against it.

You’re in.

Reflections from the Grid

This lab is a reminder that vulnerabilities aren’t always loud or obvious. Sometimes they hide in plain sight, waiting for someone to connect the dots.

UNION injections, when combined with careful reconnaissance, can transform a minor flaw into full system compromise. It’s not just about breaking in—it’s about understanding how the system thinks, and then rewriting its logic.

In the neon-lit sprawl of modern applications, data is power. And those who can shape queries… shape reality.

Stay sharp out there.