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Microsoft Excel String Parsing Integer Overflow

Microsoft Excel String Parsing Integer Overflow
Posted Jun 10, 2009
Authored by Carsten Eiram | Site secunia.com

Secunia Research has discovered a vulnerability in Microsoft Office Excel, which can be exploited by malicious people to compromise a user's system. The vulnerability is caused due to an integer overflow error when processing the number of strings in a file and can be exploited to cause a heap-based buffer overflow via a specially crafted Excel file. Successful exploitation allows execution of arbitrary code. Microsoft Office Excel 2003 is affected.

tags | advisory, overflow, arbitrary
advisories | CVE-2009-0561
SHA-256 | 0251d077d2031e1be742cc7ddd46fb1a1e943fa6b34bd0b48d23aaf5025773a5

Microsoft Excel String Parsing Integer Overflow

Change Mirror Download
====================================================================== 

Secunia Research 09/06/2009

- Microsoft Excel String Parsing Integer Overflow -

======================================================================
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

======================================================================
1) Affected Software

* Microsoft Office Excel 2003

NOTE: Other versions may also be affected.

======================================================================
2) Severity

Rating: Highly critical
Impact: System compromise
Where: Remote

======================================================================
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/excel

======================================================================
4) Description of Vulnerability

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

The vulnerability is caused due to an integer overflow error when
processing the number of strings in a file and can be exploited to
cause a heap-based buffer overflow via a specially crafted Excel
file.

Successful exploitation allows execution of arbitrary code.

======================================================================
5) Solution

Apply patches from MS09-021.

======================================================================
6) Time Table

10/03/2009 - Vendor notified.
10/03/2009 - Vendor response.
19/05/2009 - Status update requested.
22/05/2009 - Vendor provides status update.
09/06/2009 - Public disclosure.

======================================================================
7) Credits

Discovered by Carsten Eiram, Secunia Research.

======================================================================
8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2009-0561 for the vulnerability.

======================================================================
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
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.

http://secunia.com/advisories/

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
to see currently vacant positions:

http://secunia.com/corporate/jobs/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/advisories/mailing_lists/

======================================================================
10) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2009-12/

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

======================================================================
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