Secunia Research: KDE Okular PDB Parsing RLE Decompression Buffer Overflow

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                 Secunia Research 25/08/2010

- KDE Okular PDB Parsing RLE Decompression 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

• KDE Okular 4.4.5

NOTE: Other versions may also be affected.

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2) Severity

Rating: Moderately critical
Impact: System access
Where: Remote

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3) Vendor's Description of Software

"Okular is a universal document viewer based on KPDF for KDE 4.".

Product Link:
http://okular.kde.org/

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4) Description of Vulnerability

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

The vulnerability is caused by a boundary error within the RLE
decompression in the "TranscribePalmImageToJPEG()" function in
generators/plucker/unpluck/image.cpp. This can be exploited to cause
a heap-based buffer overflow by e.g. tricking a user into opening a
specially crafted PDB file.

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5) Solution

Apply patches. See the vendor's advisory for additional details.
http://www.kde.org/info/security/advisory-20100825-1.txt

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6) Time Table

11/08/2010 - Vendor notified.
11/08/2010 - Vendor response.
25/08/2010 - 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-2010-2575 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
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
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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/2010-109/

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

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