Secunia Research: NJStar Word Processor Font Name Buffer Overflow

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                     Secunia Research 20/02/2006

        - NJStar Word Processor Font Name Buffer Overflow  -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Description of Vulnerability.........................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Secunia........................................................8
Verification.........................................................9

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1) Affected Software 

* NJStar Chinese/Japanese Word Processor 5.01.41108.
* NJStar Chinese/Japanese Word Processor 4.x and 5.0x.

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2) Severity 

Rating: Moderately Critical
Impact: System access
Where:  Remote

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3) Description of Vulnerability

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

The vulnerability is caused due to a boundary error within the
handling of font names read from a NJStar document file (".njx").
This can be exploited to cause a stack-based buffer overflow.

Successful exploitation allows arbitrary code execution when a
malicious ".njx" file is opened.

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4) Solution 

Update to version 5.10.

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5) Time Table 

03/02/2006 - Initial vendor notification.
04/02/2006 - Initial vendor reply.
18/02/2006 - Vendor released fixed versions.
20/02/2006 - Public disclosure.

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6) Credits 

Discovered by Tan Chew Keong, Secunia Research.

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7) References

No other references.

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8) About Secunia 

Secunia collects, validates, assesses, and writes advisories regarding 
all the latest software vulnerabilities disclosed to the public. These 
advisories are gathered in a publicly available database at the 
Secunia website: 

http://secunia.com/

Secunia offers services to our customers enabling them to receive all 
relevant vulnerability information to their specific system 
configuration. 

Secunia offers a FREE mailing list called Secunia Security Advisories: 

http://secunia.com/secunia_security_advisories/

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9) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2006-5/advisory/

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

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