Secunia Research: Microsoft Word RTF Polyline/Polygon Integer Overflow

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                     Secunia Research 09/12/2008

        - Microsoft Word RTF Polyline/Polygon Integer 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 

* Microsoft Office Word 2003 SP3
* Microsoft Office Word Viewer 2003 SP3

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System compromise
Where:  Remote

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3) Vendor's Description of Software 

"Office Word ... provides editing and reviewing tools that help you
create professional documents more easily than ever before."

Product Link:
http://office.microsoft.com/en-us/word/default.aspx

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4) Description of Vulnerability

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

The vulnerability is caused due to an integer overflow error when 
calculating the space required for the specified number of points in 
a polyline or polygon. This can be exploited to cause a heap-based 
buffer overflow during parsing of objects in Rich Text Format (.rtf) 
files e.g. when a user opens a specially crafted .rtf file with Word 
or previews a specially crafted e-mail.

Successful exploitation may allow execution of arbitrary code.

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5) Solution 

Apply patches from MS08-072.

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6) Time Table 

16/05/2008 - Vendor notified.
16/05/2008 - Vendor response.
03/07/2008 - Vendor provides status update.
15/08/2008 - Status update requested from vendor.
15/08/2008 - Vendor provides status update.
30/09/2008 - Vendor provides status update.
09/12/2008 - Vendor acknowledges that fix will be issued today.
09/12/2008 - Vendor publishes security bulletin.
09/12/2008 - Public disclosure.

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7) Credits 

Discovered by Dyon Balding, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2008-4025 for the vulnerability.

MS08-072 (KB957173):
http://www.microsoft.com/technet/security/Bulletin/MS08-072.mspx

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9) About Secunia

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2008-21/

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

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