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Secunia Research: PDF-XChange Viewer Content Parsing Memory Corruption Vulnerability

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                     Secunia Research 04/01/2010

- PDF-XChange Viewer Content Parsing Memory Corruption 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 

* PDF-XChange Viewer 2.0.42.9

NOTE: Other 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 

"Those wishing to view PDF files on their Windows PC's now have a 
choice when it comes to Viewing PDF files - the PDF-XChange Viewer is
smaller, faster and more feature rich than the Adobe Reader which has
until now been the Reader of choice for PDF files - we think that's 
about to change!".

Product Link:
http://www.docu-track.com/home/prod_user/

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4) Description of Vulnerability

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

The vulnerability is caused due to an input validation error in 
PDFXCview.exe when parsing certain content and can be exploited to 
corrupt memory via a specially crafted PDF file.

Successful exploitation allows execution of arbitrary code when a user
views a malicious PDF document.

NOTE: The vulnerable code is e.g. also present in the bundled 
PDF-XChange shell extension (XCShInfo.dll), which is installed by 
default. This vector allows exploitation as soon as a user e.g. 
selects a malicious PDF file or hovers the mouse pointer over it.

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5) Solution 

Update to version 2.044.

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6) Time Table 

29/12/2009 - Vendor notified.
29/12/2009 - Vendor response received.
31/12/2009 - Vendor issues fixed version and statement.
04/01/2010 - 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 not 
currently assigned a CVE identifier 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
database as a service to the security community and private 
individuals, who are interested in or concerned about IT-security.

http://secunia.com/advisories/

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://secunia.com/secunia_research/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/corporate/jobs/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/advisories/mailing_lists/

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2009-64/

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

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