Chyrp CMS 2.5.2 Cross Site Scripting

`Security Advisory - Curesec Research Team  
  
1. Introduction  
  
Affected Product: Chyrp CMS 2.5.2  
Fixed in: not fixed  
Fixed Version Link: n/a  
Vendor Github: https://github.com/chyrp/chyrp  
Vulnerability Type: XSS  
Remote Exploitable: Yes  
Reported to vendor: 09/01/2015  
Disclosed to public: 10/07/2015  
Release mode: Full Disclosure  
CVE: n/a  
Credits Tim Coen of Curesec GmbH  
  
2. Vulnerability Description  
  
There is an XSS vulnerability in Chyrp CMS 2.5.2. With this, it is possible to  
steal cookies, bypass CSRF protection, or inject JavaScript keyloggers.  
  
The vulnerability exists because the key of all GET arguments is echoed without  
encoding.  
  
3. Proof of Concept  
  
  
http://localhost/chyrp/themes/firecrest/images/dots-green.gif?"></script><script>alert(1)</script>=1  
  
4. Code  
  
  
/includes/class/Theme.php:231  
public function javascripts() {  
$config = Config::current();  
$route = Route::current();  
  
$args = "";  
foreach ($_GET as $key => $val)  
if (!empty($val) and $val != $route->action)  
$args.= "&".$key."=".urlencode($val);  
  
$javascripts = array($config->chyrp_url."/includes/lib/gz.php?file=jquery.js",  
$config->chyrp_url."/includes/lib/gz.php?file=plugins.js",  
$config->chyrp_url.'/includes/javascript.php?action='.$route->action.$args);  
  
5. Solution  
  
This issue was not fixed by the vendor.  
  
6. Report Timeline  
  
09/01/2015 Informed Vendor about Issue (no reply)  
09/22/2015 Reminded Vendor of disclosure date (no reply)  
10/07/2015 Disclosed to public  
  
  
Blog Reference:  
http://blog.curesec.com/article/blog/Chyrp-CMS-252-XSS-61.html  
  
  
`