From: Secunia Security Advisories (sec-advsecunia.com)
Date: Tue Feb 24 2009 - 14:24:04 CST

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TITLE:
Microsoft Excel Invalid Object Reference Vulnerability

SECUNIA ADVISORY ID:
SA33954

VERIFY ADVISORY:
http://secunia.com/advisories/33954/

DESCRIPTION:
A vulnerability has been reported in Microsoft Excel, which can be
exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error that may cause an invalid
object to be referenced when opening an Excel document.

Successful exploitation allows execution of arbitrary code.

NOTE: According to Microsoft, the vulnerability is currently being
actively exploited.

SOLUTION:
The vendor recommends using MOICE (Microsoft Office Isolated
Conversion Environment) for opening untrusted Office documents and/or
using Microsoft Office File Block policy to block the opening of
Office 2003 and earlier documents.

PROVIDED AND/OR DISCOVERED BY:
Reported as a 0-day.

ORIGINAL ADVISORY:
Microsoft:
http://www.microsoft.com/technet/security/advisory/968272.mspx

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