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Secunia Research: Xpdf JBIG2 Symbol Dictionary Buffer Overflow Vulnerability

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                     Secunia Research 17/04/2009

    - Xpdf JBIG2 Symbol Dictionary 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 

* Xpdf 3.02pl2

NOTE: Prior 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 

"Xpdf is an open source viewer for Portable Document Format (PDF)
files. (These are also sometimes also called 'Acrobat' files, from the
name of Adobe's PDF software.) The Xpdf project also includes a PDF
text extractor, PDF-to-PostScript converter, and various other
utilities.".

Product Link:
http://www.foolabs.com/xpdf/

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4) Description of Vulnerability

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

The vulnerability is caused due to a boundary error while decoding 
JBIG2 symbol dictionary segments. This can be exploited to cause a 
heap-based buffer overflow via a specially crafted PDF file.

Successful exploitation may allow execution of arbitrary code.

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5) Solution 

Apply xpdf-3.02pl3.patch.

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6) Time Table 

26/03/2009 - Vendor notified.
26/03/2009 - vendor-sec notified.
27/03/2009 - Vendor response.
17/04/2009 - 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-2009-0195 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
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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
do active vulnerability research in order to aid improving the 
security and reliability of software in general:

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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/advisories/mailing_lists/

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2009-17/

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

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