# Challenge Name: orm-bad
![date](https://img.shields.io/badge/date-09.07.2021-brightgreen.svg)  ![solved in time of CTF](https://img.shields.io/badge/solved-in%20time%20of%20CTF-brightgreen.svg)   ![web category](https://img.shields.io/badge/category-Web-blueviolet.svg)   ![value](https://img.shields.io/badge/value-102-blue.svg)  
## Description
I just learned about orms today! They seem kinda difficult to implement though... Guess I'll stick to good old raw sql statements!
orm-bad.mc.ax
Author : ra
[app.js](app.js)
## Detailed solution
Start by oppening the challenge link https://orm-bad.mc.ax/
![2021-07-13_15h54_41](https://user-images.githubusercontent.com/72421091/125474442-711fe1bc-8716-4d01-a6ec-18f004df249d.png)
Checking the page source  view-source:https://orm-bad.mc.ax/ ```html
<html lang="en">
<body>    <div style="text-align:center">         <h1>Sign in:</h1>        <form id="login_form" action="/flag" method="POST">            <label for="username">Username: </label><input type="text" name="username" id="username">            <label for="password">Password: </label><input type="password" name="password" id="username">            <input type="submit" name="submit" id="submit" value="Login">        </form>    </div></body>```Just a simple login form that POST username and password to /flag
Now let's check the [app.js](app.js) file
We cann se that our app is a NodeJS/Express web app that use sqlite3 as database
Let's check the POST request to /flag
```javascriptapp.post('/flag', (req, res) => {    db.all("SELECT * FROM users WHERE username='" + req.body.username + "' AND password='" + req.body.password + "'", (err, rows) => {        try {            if (rows.length == 0) {                res.redirect("/?alert=" + encodeURIComponent("you are not admin :("));            } else if(rows[0].username === "admin") {                res.redirect("/?alert=" + encodeURIComponent(flag));            } else {                res.redirect("/?alert=" + encodeURIComponent("you are not admin :("));            }        } catch (e) {            res.status(500).end();        }    })})```We can see the sql query used to login ```"SELECT * FROM users WHERE username='" + req.body.username + "' AND password='" + req.body.password + "'"``` 
To bypass login and get the flag we need to use the username admin (rows[0].username === "admin") and make the query true without knowing the password
Let's perform some sql injection in the password parametre. I'm gonna use burp
Capture the post request while logging in and focus the password parametre
![image](https://user-images.githubusercontent.com/72421091/125477742-db725124-2196-41fa-8b6a-af91c0d32f4d.png)
Use some payloads from https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/Intruder/Auth_Bypass.txt 
We got our flag we can url decode it from that alert parametre or check the success page
![image](https://user-images.githubusercontent.com/72421091/125478434-6a439727-3ae1-4423-b33b-b8c1e7603f36.png)
![image](https://user-images.githubusercontent.com/72421091/125478760-132fba72-6105-4afd-a06d-6a87d883c6c3.png)
## Flag
```flag{sqli_overused_again_0b4f6}```