You know how you can use your favourite food delivery app to place an order and then track the driver right to your door? That magic isn’t one giant program. It’s a bunch of smaller services talking to each other through APIs.
Think of an API as a special waiter for software. You don’t talk to the kitchen directly; you give your order to the waiter, who then communicates it perfectly to the chefs. In the digital world, an API (Application Programming Interface) does the same thing, allowing different apps and services to talk to each other seamlessly. They’re the invisible engine behind almost every modern app you use. And because they are everywhere, they have become the new front door for hackers. In fact, industry reports show that API attacks were one of the most frequent attack vectors last year, affecting businesses from retail to finance. Let’s talk about why they’re a bit tricky and how you can get started with protecting your APIs.
What Makes Securing APIs So Different?
When you visit a website, it’s designed for a human. It has buttons and pictures and is meant for you to browse. An API is different. Developers build it for computers to get straight to the point.
The API is the direct ordering terminal that the kitchen uses. It’s incredibly efficient, but it also exposes the kitchen’s inner workings more directly. A person with the right access code can place an order for anything, and the kitchen will just make it.
This direct, computer-to-computer talk means APIs have their own unique set of security challenges. They handle raw data directly, adding to the broader issue that software risk is everywhere. The rules for protecting your APIs simply have to be a little different.
Meet the Usual Suspects
Thankfully, some very smart people have created a guide for this. The OWASP API Security Top 10 is the go-to list for understanding the biggest risks. You don’t need to memorise all ten, but let’s look at one of the most common problems.
It’s called Broken Object Level Authorization, or BOLA.
That sounds complicated, but the idea is simple. Let’s call it the “Peeking Over the Fence Problem.”
Imagine your app has a web address like example.com/api/user/123/profile. That 123 is your user ID. A curious person might try changing that number to 124 in the address bar. A poorly secured API might just go ahead and show them the profile for user 124. The API didn’t check who was asking; it only cared what they were asking for. This is a huge problem, and it happens all the time.
So how do you guard against the ‘Peeking Over the Fence Problem’ and hundreds of other potential exploits? You don’t need to start from scratch. The key is to integrate security directly into your development process with a layered defense.
How to Lock Your New Front Door
Here’s the good news. Securing your APIs doesn’t require throwing out everything you know. It’s about applying the right security tools and processes to this new front door.
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Look at the Blueprints (Your Code) Before an API is even running, you can find a huge number of potential problems just by looking at the source code. Forgetting to add that critical permission check for user 124 is a mistake that can be caught here. This is exactly what Static Application Security Testing (SAST) is for. An automated SAST tool would scan your code and flag that you’re accessing a user profile without first verifying if the person asking has the right to see it, stopping the ‘Peeking Over the Fence Problem’ before it ever starts. - Check Your Ingredients (Your Dependencies) Your API code probably uses a bunch of helpful open-source libraries to get the job done. A vulnerability in one of those libraries is now a vulnerability in your app. You need to know what ingredients you’re using. This is where Software Composition Analysis (SCA) comes in. It checks all your third-party components for known security issues, making sure your foundation is solid.
- Rattle the Front Door (Your Live App) Once your API is up and running in a test environment, you need to check it from the outside, just like an attacker would. This involves sending it unexpected requests and weird data to see if it breaks. That’s the job of Dynamic Application Security Testing. It’s the best way to see how your API actually behaves in the wild when someone starts rattling the doorknobs.
Look at the Blueprints (Your Code) Before an API is even running, you can find a huge number of potential problems just by looking at the source code. Forgetting to add that critical permission check for user 124 is a mistake that can be caught here. This is exactly what These tools work together to give you a full picture of your API’s security, from the inside out. They help you address many of the classic risks that are still very relevant, like the ones found in the OWASP Top 10.
It’s All About Being Intentional
Protecting your APIs might seem daunting, but it boils down to being intentional. It’s about remembering that you have a new, very important front door to your application and using smart, automated tools to make sure it stays locked. By building security checks right into your development process, you can keep the magic of your apps working for your users, and only your users.
Building this kind of intentional, automated security into your process is our expertise. We help companies implement the very tools and methodologies—from SAST to SCA—that keep their applications secure.
Ready to lock your new front door? Contact our security experts today for a consultation.
Black Duck Partner | Application Security Solutions | Contact us
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