Bypass WAF & Grab a $300 Bug Bounty!

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I was exploring a private bug bounty program when I came across a Web Application Firewall that thought it was tough. But I had a few tricks up my sleeve to outsmart it and grab a quick $300 bounty!

The Setup

So, here’s the deal, you’re chilling with your usual bug-hunting. Everything looks standard until… boom, you hit a brick wall. Enter the WAF — our beloved Web Application Firewall, sitting there like a bouncer saying, “No exploits allowed.”

Step 1: Poking the WAF

First things first , what kind of WAF are we dealing with? Some are smart, some… not so much. So, we start with our usual payloads:

And just like that, WAF comes out swinging, blocking us like we’re trying to sneak in with a fake ID.

Step 2: Time to Get Sneaky

Next up, let’s get a little creative. How about some obfuscation? We know the WAF has pattern-matching rules, so we start trying different variations to break through its defenses.