Document Title: =============== Oxwall Forum v1.8.1 - Persistent Cross Site Scripting Vulnerability
References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1740 Release Date: ============= 2016-02-22 Vulnerability Laboratory ID (VL-ID): ==================================== 1740 Common Vulnerability Scoring System: ==================================== 3.6 Product & Service Introduction: =============================== Oxwall is unbelievably flexible and easy to use PHP/MySQL social networking software platform. Its flexibility is an extremely easy way to change the way it works using Oxwall plugins. These plugins are complete units of functionality that can be used for various purposes. We take special care about core and plugins compatibility so any updates are easy like a breeze. Just click that button in the admin area. Oxwall offers unseen level of efficiency when you need a full-featured, working site. The project is operated by Oxwall Foundation – a non-profit that oversees the platform development and coordinates third party efforts. (Copy of the Homepage: http://www.oxwall.org/index ) Abstract Advisory Information: ============================== An independent vulnerability laboratory researcher discovered an application-side cross site scripting vulnerability in the official Oxwell v1.8.1 Forums. Vulnerability Disclosure Timeline: ================================== 2016-02-22: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Oxwall Software Product: Oxwall Forums (Web-Application) 1.8.1 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A persistent Cross site scripting vulnerability has been discovered in the official Oxwall social network web Application software The security vulnerability allows remote attackers to inject own script code to the application-side of the affected application module. The vulnerability is located in `Forums of users` module. Remote attackers with low privilege web-application user accounts are able to inject own malicious script code via POST method request to the application-side. The injection points are the `Forum name` and `Description` parameters in the add POST method request. The vulnerability is located to the application-side of the vulnerable web-application and the request method to inject is POST. The security risk of the application-side input web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.5. Exploitation of the persistent validation web vulnerability requires a low privileged web-application user account and low or medium user interaction. Successful exploitation of the vulnerabilities results in persistent phishing mails, session hijacking, persistent external redirect to malicious sources and application-side manipulation of affected or connected module context. Request Method(s): [+] POST Vulnerable Module(s): [+] Forums of users Vulnerable Parameter(s): [+] Forum name (group-name) [+] Description (description) Affected Module(s): [+] Oxwall forums Proof of Concept (PoC): ======================= The application-side input validation web vulnerability can be exploited by remote attackers with low privileged web-application user account and low or medium user interaction. For security demonstration or to reproduce the web vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. A Moderator or an user with custom roles goes to: Note: http://localhost:8080/SCRIPTPATH/forum/customize 2. Add new forum [ group] and inject Persistent XSS codes into application side 3. The code executes in the moderators location 4. Successful reproduce of the application-side vulnerability! --- [POST METHOD] (Values) --- form-add= add-forum-form group-name = [PERSISTENT CODE] section = General description = [ PERSISTENT CODE] submit button Reference(s): http://localhost:8080/SCRIPTPATH/forum/customize Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure parse and encode of the vulnerable groupname and description input fields. Restrict the input and disallow usage of special chars. Filter and setup a secure exception handling that prevents the persistent execution in the output location. Security Risk: ============== The security risk of application-side cross site scripting web vulnerability in oxwall web application software is estimated as medium. (CVSS 3.5) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Lawrence Amer - http://www.vulnerability-lab.com/show.php?user=Lawrence%20Amer 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. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. 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