Document Title: =============== File Explorer v1.4 iOS - Information Disclosure Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2220 Release Date: ============= 2020-04-28 Vulnerability Laboratory ID (VL-ID): ==================================== 2220 Common Vulnerability Scoring System: ==================================== 7 Vulnerability Class: ==================== Privacy Violation - Information Disclosure Current Estimated Price: ======================== 500€ - 1.000€ Product & Service Introduction: =============================== File Explorer is the privacy app to organize and view all your files on your iPhone or iPad. Always have your important files with you, protect your privacy perfectly file. (Copy of the Homepage: https://apps.apple.com/lu/app/file-explorer-vedio-manager-photo-manager-file-browser/id954838257 ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered an information disclosure vulnerability in the File Explorer v1.4 mobile ios web-application. Affected Product(s): ==================== Nong Ge Product: File Explorer v1.4 - iOS Mobile Web-Application Vulnerability Disclosure Timeline: ================================== 2020-04-28: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Local Severity Level: =============== High Authentication Type: ==================== Pre auth - no privileges User Interaction: ================= No User Interaction Disclosure Type: ================ Independent Security Research Technical Details & Description: ================================ An information disclosure web vulnerability has been discovered in the official File Explorer v1.4 mobile ios web-application. The local file explorer application can be protected with a local pin. Any time the user opens the app, the pin is required for the auth to access to private file explorer data. The protection form is attached to process after the main form with for example the list in the local application context. Normally the pin must popup ahead to the local file index but in this case is processed afterwards. Thus allows a local attacker with physical ios device access to bypass the security mechanism to preview files (names, size & co) and access the protected data. Successful exploitation of the local information disclosure application vulnerability results in unauthorized data access. Proof of Concept (PoC): ======================= The information disclosure vulnerability can be exploited by local attackers with physical device access without 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. Install the local application 2. Open the settings and setup a pin to protect 3. Move to the local web-server via wifi and start it 4. Upload some files for the index dir listing to preview 5. Close the app and open it back by restart Note: Now the pin should appear 6. Push a folder path or file that becomes visible and hold it 7. Push home again 8. Way free to edit and preview the files 9. Successful reproduce of the local vulnerability! Security Risk: ============== The security risk of the information disclosure vulnerability in the web-application is estimated as high. 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. 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