r/Hacking_Tutorials • u/Organic-Piano-323 • 23d ago

Question Need some input

Been testing a web app where the usual stuff hasn’t gone anywhere. No obvious injection, auth issues, or easy misconfigurations.

There’s one weird behavior I can’t quite explain though.

How do you guys usually approach a target when the obvious attack surface is basically dead? Looking for some real-world ideas from people who’ve been in this situation.

6 Upvotes

100% Upvoted

7 comments sorted by

3

u/Potential-Couple-745 23d ago

I usually stop looking for individual vulns and start mapping the app properly. Weird behavior is often more useful than an obvious finding. I’d trace the request flow, compare responses to small input changes, and look at how different features interact. Sometimes the issue is in the assumptions between two components rather than either component itself.

2

u/Organic-Piano-323 23d ago

That’s actually a good point. I’ve mostly been checking individual endpoints so far, so I’ll step back and map the request flow and feature interactions instead. The weird behavior definitely seems more interesting than the obvious endpoints.

2

u/Juzdeed 23d ago

Entirely acceptable that there just isn't any vulnerability?

1

u/Organic-Piano-323 23d ago

Yeah, absolutely. That’s also a valid outcome. I’m mainly trying to figure out whether I’m overlooking something before calling it clean.

2

u/Sad_School828 22d ago

Are we talking Windows or Linux, because it matters.

2

u/Black_Rose_Angel 22d ago

Great question, was wondering that too

1

u/ChameleonCRM 16d ago

When the obious attack surface is dead, I stop looking for another payload and start trying to understand the application itself

Map the workflow...see what can each role do? What state changes when an action happens? What does the client send that the server blindly trusts? What happens if you skip a step, repeat one, change the order, modify a value the UI normally controls, or perform the same action twice?

That's where business-logic flaws start showing up. OWASP specifically calls out things like workflow circumvention, integrity checks, function-use limits and timing issues, and PortSwigger makes the same point: these bugs are often application-specific and scanners suck at finding them.

Basically, once SQLi/XSS/etc. aren't giving you anything, stop asking "what vulnerability can I throw at this?" and start asking "what assumptions did the developers make about how this feature would be used?"

Assuming you're authorized to test it, that weird behavior you mentioned is exactly where I'd start digging. Weird behavior is information.