Secunia Research: XnView Slideshow "FontName" Buffer Overflow Vulnerability

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                     Secunia Research 31/03/2008

    - XnView Slideshow "FontName" Buffer Overflow Vulnerability -

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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 

XnView 1.92 and 1.92.1.

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 

"A software to view and convert graphic files, really simple to use!".

Product Link:
http://pagesperso-orange.fr/pierre.g/xnview/enhome.html

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4) Description of Vulnerability

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

The vulnerability is caused due to a boundary error when processing
the "FontName" parameter of slideshow files (*.sld). This can be
exploited to cause a stack-based buffer overflow by e.g. tricking a
user into opening a specially crafted slideshow file with an overly
long "FontName" parameter.

Successful exploitation allows the execution of arbitrary code.

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5) Solution 

Update to version 1.93.4.
http://pagesperso-orange.fr/pierre.g/xnview/endownload.html

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6) Time Table 

29/01/2008 - Vendor notified.
29/01/2008 - Vendor response.
31/03/2008 - Public disclosure.

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7) Credits 

Discovered by Stefan Cornelius, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2008-0069 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 to
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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/2008-06/

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

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