Document Title: =============== WP eCommerce 3.9.1 plugin -XSS & CSRF Web Vulnerability Release Date: ============= 2014-12-30 Product & Service Introduction: =============================== https://wpecommerce.org Abstract Advisory Information: ============================== The Hackyard Security Group Researcher-Team leaded by 0x0A discovered a cross site request forgery issue and a cross site scripting vulnerability in the Wordpress eCommerce plugin. Vulnerability Disclosure Timeline: ================================== 2014-12-27: Author Notification (0x0A) 2015-1-20: Public Disclosure Discovery Status: ================= Published Affected Product(s): ==================== Wordpress Product: WP eCommerce plugin 3.9.1 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A client-side cross site request forgery issue and a cross site scripting vulnerability has been discovered in the Wordpress eCommerce 3.9.1 plugin. The client-side cross site request forgery vulnerability allows remote attackers to force client-side requests to execute application functions. The client-side cross site scripting vulnerability allows remote attackers to inject malicious script codes to compromise administrator session data. The xss vulnerability is located in the username and userpass values of the display-sales-logs.php file POST method request. Remote attackers are able to inject malicious script codes to the client-side application request. The csrf vulnerability is located in the same value request and allows to request the account session data. Both issues are only exploitable on the client-side of the application and the request method to inject is POST. The security risk of the client-side web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 2.5. Exploitation of the client-side web vulnerability requires no privileged web-application user account and low or medium user interaction. Successful exploitation of the vulnerabilities result in non-persistent phishing mails, session hijacking, non-persistent external redirect to malicious sources and client-side manipulation of affected or connected module context. Request Method(s): [+] POST Vulnerable Module(s): [+] controller Vulnerable Parameter(s): [+] c= Affected Module(s): [+] display-sales-logs.php Proof of Concept (PoC): ======================= The client-side cross site request forgery issue and a cross site scripting vulnerability can be exploited by remote attackers with low or medium user interaction. For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerabilities ... PoC: display-sales-logs.php <?php $controller = $_REQUEST['c']; $target = $argv[0]; $ch = curl_init("http://127.0.0.1"); curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); curl_setopt($ch, CURLOPT_URL, "http://127.0.0.1/wordpress/wp-content/plugins/wp-e-commerce/wpsc-admin/display-sales-logs.php?c=<script>alert(document.cookie);</script>"); curl_setopt($ch, CURLOPT_HTTPGET, 1); curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"); curl_setopt($ch, CURLOPT_TIMEOUT, 3); curl_setopt($ch, CURLOPT_LOW_SPEED_LIMIT, 3); curl_setopt($ch, CURLOPT_LOW_SPEED_TIME, 3); curl_setopt($ch, CURLOPT_COOKIEJAR, "/tmp/cookie_$target"); $buf = curl_exec ($ch); curl_close($ch); unset($ch); echo $buf; ?> Reference(s): POC : http://i.imgur.com/Rbl4x00.png Solution - Fix & Patch: ======================= 2015-1-19: Encode all user tainted data with PHP buildin functions before embedding the data into the output. Make sure to set the parameter ENT_QUOTES to avoid an eventhandler injections to existing HTML attributes and specify the correct charset. 1: print ("controller " . htmlentities($_GET["c"], ENT_QUOTES, "utf-8"); Security Risk: ============== The security risk of the cross site request forgery and cross site scripting vulnerability is estimated as medium. (CVSS 2.5) Credits & Authors: ================== Neo Hapsis aka 0x0A- Information Security Researcher [https://hackyard.net] Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. 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