[FD] Guppy CMS v5.01.03 - Client Side Cross Site Scripting Web Vulnerability

Document Title: =============== Guppy CMS v5.01.03 - Client Side Cross Site Scripting Web Vulnerability References (Source): ==================== http://ift.tt/2aOQivy Release Date: ============= 2016-07-29 Vulnerability Laboratory ID (VL-ID): ==================================== 1887 Common Vulnerability Scoring System: ==================================== 3.3 Product & Service Introduction: =============================== GuppY, the easy, free and databaseless web portal, will allow you to generate very easily a complete and interactive web site. A guestbook, a forum and the possibility to easily add some mods as poll, gallery, directory, etc. (Copy of the Vendor Homepage: http://ift.tt/1qOhRH6 ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a client-side cross site scripting vulnerability in the official Guppy v5.01.03 open-source content management system. Vulnerability Disclosure Timeline: ================================== 2016-07-29: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== GuppY Product: Gruppy - Content Management System (Web-Application) 5.01.03 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A client-side cross site scripting web vulnerability has been discovered in the official Guppy v5.01.03 open-source content management system. The vulnerability allows remote attackers to inject malicious script codes on client-side browser to web-application GET method requests. The vulnerability is located in the groups parameter of the admin.php file. Remote attackers are able to prepare special crafted malicious links to trigger a client-side cross site scripting issue aginst the cms administrator accounts. The request method to inject is GET and the attack vector is located on the client-side of the content management system. The security risk of the non-persistent vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.3. Exploitation of the persistent input validation web vulnerability requires no privileged web-application user account and only low user interaction. Successful exploitation of the vulnerability results in session hijacking, non-persistent phishing, non-persistent external redirects to malicious source and non-persistent manipulation of affected or connected application modules. Request Method(s): [+] GET Vulnerable Module(s): [+] Administrator Backend - User Management Vulnerable File(s): [+] admin.php Vulnerable Parameter(s): [+] groups Proof of Concept (PoC): ======================= The client-side cross site scripting web vulnerability can be exploited by remote attackers without privileged user account and with low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. PoC. Exploitation http://ift.tt/2aezNvG http://ift.tt/2aZ8frb http://ift.tt/2aeABAK PoC: Admin Backend (admin.php?lng=fr&pg=members&act=6&group)

Ici vous pouvez ajouter ou supprimer un membre du groupe privé

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<[CLIENT SIDE SCRIPT CODE EXECUTION OF GROUPS!]img src="x" onerror="prompt(22);">" />

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