Document Title: =============== ThumbDrive v1.1 (USB) iOS - Multiple Web Vulnerabilities Date: ===== 2016-02-04 References: =========== http://www.vulnerability-lab.com/get_content.php?id=1707 VL-ID: ===== 1707 Common Vulnerability Scoring System: ==================================== 6.6 Introduction: ============= Turn your iPhone/iPod touch/iPad into a thumb drive using this app. Simply type the IP address generated from this app on your favorite browser and start downloading and uploading your files. Carry around your files with you and share them with your friends and family. (Copy of the Homepage: https://itunes.apple.com/us/app/thumbdrive-portable-storage/id374200932 ) Abstract: ========= The Vulnerability Laboratory Core Research Team discovered multiple vulnerabilities in the official ThumbDrive v1.1 iOS mobile web-application. Report-Timeline: ================ 2016-02-04: Public Disclosure (Vulnerability Laboratory) Status: ======== Published Affected Products: ================== Changsoo Im Product: ThumbDrive - iOS Wifi (Web-Application) v1.1 Keke Cai Product: Mobile Drive Free - iOS Wifi (Web-Application) v1.8 Exploitation-Technique: ======================= Remote Severity: ========= High Details: ======== 1.1 An arbitrary file upload web vulnerability has been discovered in the official ThumbDrive v1.1 iOS mobile web-application. The arbitrary file upload vulnerability allows remote attackers to unauthorized include local file/path requests or system specific path commands to compromise the mobile web-application. The web vulnerability is located in the `filename` value of the `file upload` module. Remote attackers are able to inject own files with malicious `filename` values in the `file upload` POST method request to compromise the mobile web-application. The arbitrary file upload execute occcurs in the index file dir listing and sub folders of the wifi interface. The attacker is able to inject the payloads by usage of the wifi interface or local file sync function. The security risk of the arbitrary file upload vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.6. Exploitation of the arbitrary file upload web vulnerability requires no user interaction or privileged web-application user account. Successful exploitation of the arbitrary file upload vulnerability results in mobile application compromise or connected device component compromise. Request Method(s): [+] [POST] Vulnerable Module(s): [+] Upload File Vulnerable Parameter(s): [+] filename Affected Module(s): [+] Index File Dir Listing (http://localhost:49549/) 1.2 An unrestricted file upload web vulnerability has been discovered in the official ThumbDrive v1.1 iOS mobile web-application. The unrestricted file upload issue allows remote attackers to upload files with multiple extensions to bypass the system validation and compromise the web-server. The vulnerability is located in the filename value of the `upload` file module. Remote attackers are able to upload a php or js web-shell by a rename of the filename with multiple extensions in the upload POST method request. The attacker uploads for example a web-shell with the following name and extension `pentest.png.html.php.js.aspx.html.png`. After the upload the attacker needs to open the file in the wifi web-application interface. He deletes the .png file extension and can access the webshell with elevated access rights to execute. The security risk of the unrestricted file upload web vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.2. Exploitation of the unrestricted file upload web vulnerability requires no user interaction or privileged web-application user account with password. Successful exploitation of the unrestricted file upload vulnerability results in unauthorized file access (aap/device) and compromise of http web-server. Request Method(s): [+] [POST] Vulnerable Module(s): [+] Upload File Vulnerable Parameter(s): [+] filename (multiple extensions) Affected Module(s): [+] Index File Dir Listing (http://localhost:49549/) Proof of Concept: ================= 1.1 The local file include web vulnerability can be exploited by remote attackers without privileged application user account or user interaction. For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue. PoC: Exploitation http://localhost:49549/./[ARBITRARY FILE UPLOAD VULNERABILITY!] --- PoC Session Logs [POST] --- Status: 200[OK] POST http://localhost:49549/ Request Header: Host[localhost:49549] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] DNT[1] Referer[http://localhost:49549/] Connection[keep-alive] POST-Daten: POST_DATA[-----------------------------237641219424375 Content-Disposition: form-data; name="file"; filename="./[ARBITRARY FILE UPLOAD VULNERABILITY!]" Vulnerable Source: Index File Dir Listing


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1.2 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: Exploitation http://localhost:49549/[UNRESTRICTED FILE UPLOAD VULNERABILITY!].png.html.js.php --- PoC Session Logs [POST] --- Status: 200[OK] POST http://localhost:49549/ Request Header: Host[localhost:49549] User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0] Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] Accept-Language[de,en-US;q=0.7,en;q=0.3] Accept-Encoding[gzip, deflate] DNT[1] Referer[http://localhost:49549/] Connection[keep-alive] POST-Daten: POST_DATA[-----------------------------304511368424425 Content-Disposition: form-data; name="file"; filename="[UNRESTRICTED FILE UPLOAD VULNERABILITY!].png.html.js.php.js.html.png" Vulnerable Source: Index File Dir Listing


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Solution: ========= 1.1 The arbitrary file upload vulnerability can be patched by a secure parse and encode of the vulnerable `filename` value in the upload POST method request. Restrict the filename input and filter with an own set exception to prevent application-side attacks. Parse also in the Index of Documents the vulnerable name output value to solve the issue. 1.2 Restrict the vulnerable `filename` value and implement a secure filter mechanism with own exception to prevent the upload of files with multiple extensions. Restrict the upload folder and disallow the execution of files that are already uploaded. Risk: ===== 1.1 The security risk of the arbitrary file upload web vulnerability in the filename value of the upload file function is estimated as high. (CVSS 6.6) 1.2 The security risk of the unrestricted file upload web vulnerability in the file upload mechanism is estimated as high. (CVSS 6.2) 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 © 2016 | Vulnerability Laboratory - [Evolution Security GmbH]™