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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
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Secunia offers a FREE mailing list called Secunia Security Advisories:

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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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