Chyrp CMS 2.5.2: XSS

Chyrp CMS 2.5.2: XSS

Date: 2015-10-07 15:48:57
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:
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


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