Secunia Research: Microsoft Excel Record Parsing Integer Overflow Vulnerability

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                     Secunia Research 12/10/2010

  - Microsoft Excel Record Parsing Integer Overflow Vulnerability -

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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 Excel 2002 SP3

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System access
Where:  From remote

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3) Vendor's Description of Software 

"Microsoft Office Excel is a powerful tool you can use to create and
format spreadsheets, and analyze and share information to make more 
informed decisions."

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

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4) Description of Vulnerability

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

The vulnerability is caused by a sign-extension error and integer 
overflow when processing a certain record type and can be exploited 
to cause a heap-based buffer overflow via a specially crafted Excel 
file.

Successful exploitation may allow execution of arbitrary code.

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5) Solution 

Apply patches provided by MS10-080.

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6) Time Table 

29/03/2010 - Vendor notified.
30/03/2010 - Vendor response.
27/04/2010 - Vendor provides status update.
30/09/2010 - Vendor provides status update.
12/10/2010 - 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-2010-3230 for the vulnerability.

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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/2010-64/

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

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