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                     Secunia Research 15/04/2009

       - DivX Web Player Stream Format Chunk 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 

* DivX Web Player version 1.4.2.7

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Highly critical 
Impact: System access
Where:  Remote

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3) Vendor's Description of Software 

"DivX Web Player lets you play up to HD-quality DivX® video in your 
web browser. You can also use DivX Web Player to easily embed DivX 
videos onto your website or blog."

Product Link:
http://www.divx.com/en/web-player-windows

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in DivX Web Player, 
which can be exploited by malicious people to compromise a user's 
system.

The vulnerability is caused due to a signedness error in the 
processing of "STRF" (Stream Format) chunks. This can be exploited to
cause a heap-based buffer overflow via a specially crafted DivX file.

Successful exploitation may allow execution of arbitrary code by 
tricking a user into visiting a malicious website.

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5) Solution 

Update to version 1.4.3.4, included in an updated DivX bundle.

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6) Time Table 

17/12/2008 - Vendor notified.
18/12/2008 - Vendor response.
11/03/2009 - DivX Web Player 1.4.3 released in a bundle update.
15/04/2009 - Public disclosure.

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7) Credits 

Discovered by Alin Rad Pop, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2008-5259 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://secunia.com/advisories/business_solutions/

Secunia also provides a publicly accessible and comprehensive advisory
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Secunia believes that it is important to support the community and to
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http://secunia.com/secunia_research/

Secunia regularly hires new skilled team members. Check the URL below
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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2008-57/

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

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