How I found XSS on Admin Page without login!

Introduction

بسم الله الرحمن الرحيم
Hello Awesome Hackers, this is my first Write-Ups in Real Target; I will explain how Fuzzing helped me get an XSS on Admin Page Just in 1 Minute!

Approaching

I am doing Bug Bounty Hunting On Open-Source Projects; As I like doing this and giving back support to these projects and its community!

So I chose an Application running PHP as I can understand its code!
I Begin with collecting Subs and Endpoints to map the full Application to have a full picture of how it works and what its capabilities are!

Interesting Endpoint

When I am checking the collecting results; Actually i check it with CTRL+F to find interesting keywords like admin, panel, dev, internal ..etc.
While doing this, I found this Link:

https://redacted.redacted.com/admin/login

Trying Some Dumb Default Password and SQLi Payload; with no Successfully Login or Bypassing!

Fuzzing

So I start Fuzzing Using Arjun as I can find any Parameter But when I do this I found a really helpful error 🤓

Arjun Helpful Error!

Arjun just pushed a helpful error as I didn’t skip it so let’s try combining the full URL; then injecting XSS Payload!

Exploitation

The full URL with the Payload becomes:

https://redacted.redacted.com/admin/login?perspective=asdf1234

After Submitting and Viewing the Source code:

ME HURRYING UP TO MAKE XSS PAYLOAD!
https://redacted.redacted.com/admin/login?perspective=asdf"onload%3d"alert('Slax Was Here!')"asdf

SUBMITTING!!

Poping-up

Wrapping Up

Remember the one rule
“Fuzzing, Fuzzing, Fuzzingggg”
I hope you guys enjoyed the Write-Up, See you on the Other one!

Twitter🐦: sl4x0
LinkedIn👨‍💼: sl4x0

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CS Student | Security Researcher ¯\_(ツ)_/¯

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