# Protecting Camp

## Challenge Description

> I made a small site to keep a list of things I need to buy to keep me safe before I go camping, maybe it's keeping some other things safe too!

## Attachments

* [protecting\_camp.zip](https://github.com/HarshJolad/writeups-pvt/blob/master/Snyk%20CTF%202023/Protecting%20Camp/protecting_camp.zip)

## Solution

* Going through the code, it looks vulnerable to `SSRF`(Server Side Request Forgery)
* In the `index.js` file

```js
app.get('/api/flag',  (req, res) => {
    var url = req.protocol + '://' + req.get('host') + req.originalUrl;
    try{
        parsed = parseUrl(url)
        if (parsed.resource != '127.0.0.1'){
            res.send("Hey... what's going on here\n");
        }else{
            fs.readFile("./flag.txt", 'utf8', (err, data) => {
                if (err) {
                    res.send("There was an error and this is sad :(\n")
            
                }else{
                    res.send(data+"\n")
                }
            });
    }} catch (error) {
        res.status(400).json({ success: false, message: 'Error parsing URL' });
    }
      
});
```

* We can see theres a `/api/flag` endpoint that reads the `flag.txt` file
* Sending a request to `/api/flag` will return `Hey... what's going on here`
* In the `index.js` we see that the server is looking for request coming from `127.0.0.1` which is the localhost
* Adding the `Host` header with value as `127.0.0.1` and sending the request to `/api/flag`, we get the flag ![flag](https://1613628666-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FKkuxWaWwvkRd57ql1rtY%2Fuploads%2Fgit-blob-3cc0d8e67402d22b87a510d21f90762b7cba040a%2Fimage.png?alt=media)

### FLAG

```
flag{d716dd8ab70bbc51a5f1d0182c84bcc8}
```


---

# 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://j0luuuu.gitbook.io/ctf/snyk-ctf-2023/protecting-camp.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.