[FD] Chyrp CMS 2.5.2: XSS

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: http://ift.tt/1Nn9MpO 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?">=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://ift.tt/1Wvj0ke

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