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                     Secunia Research 24/01/2007

       - Sienzo Digital Music Mentor -
     - NCTAudioFile2 ActiveX Control Buffer Overflow -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

Sienzo Digital Music Mentor (DMM) 2.6.0.3

NOTE: Prior versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System compromise
Where:  Remote

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3) Vendor's Description of Software 

"DMM is a software that helps you get the guitar chords and bass tabs
for any pop/rock/country song. DMM even shows you how to play the
chords! It is so simple to use."

Product Link:
http://www.sienzo.com/product.asp

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in Sienzo Digital 
Music Mentor, which can be exploited by malicious people to compromise
a user's system.

The vulnerability is caused due to a boundary error in the
NCTAudioFile2.AudioFile ActiveX control when handling the
"SetFormatLikeSample()" method. This can be exploited to cause a 
stack-based buffer overflow by passing an overly long string (about 
4124 bytes) as argument to the affected method.

Successful exploitation allows execution of arbitrary code when a
user e.g. visits a malicious website.

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5) Solution 

Update to version 2.6.0.4.

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6) Time Table 

17/01/2007 - Vendor notified.
18/01/2007 - Vendor response.
19/01/2007 - Vendor issues fixed version.
24/01/2007 - Public disclosure.

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7) Credits 

Discovered by Carsten Eiram, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2007-0018 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private 
individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the 
security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

Secunia regularly hires new skilled team members. Check the URL below
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Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/ 

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-15/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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