Secunia Research: Ghostscript jbig2dec JBIG2 Processing Buffer Overflow

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                 Secunia Research 09/04/2009

   - Ghostscript jbig2dec JBIG2 Processing 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

• Ghostscript version 8.64

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

"An interpreter for the PostScript (TM) language, with the ability to
convert PostScript language files to many raster formats, view them
on displays, and print them on printers that don't have PostScript
language capability built in; An interpreter for Portable Document
Format (PDF) files, with the same abilities; …"

Product Link:
http://www.ghostscript.com/Ghostscript.html

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4) Description of Vulnerability

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

The vulnerability is caused due to a boundary error in the included
jbig2dec library 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

Do not process untrusted PDF files.

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6) Time Table

26/03/2009 - Vendor notified.
26/03/2009 - vendor-sec notified.
02/04/2009 - Vendor response.
09/04/2009 - 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-2009-0196 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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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/2009-21/

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

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