Microsoft Excel Vulnerability


It has been reported that a vulnerability existing in Microsoft Excel
is being exploited in the wild.  Exploitation of the vulnerability
involves interaction with Excel spreadsheets specially crafted by
malicious users.  Successful exploitation may allow code execution at
the permissions level of the logged in user, whereas unsuccessful
exploitation may result in a DoS condition.

**UPDATE** MS has confirmed the following versions as vulnerable:

Microsoft Office Excel 2000 Service Pack 3

Microsoft Office Excel 2002 Service Pack 3

Microsoft Office Excel 2003 Service Pack 3

Microsoft Office Excel 2007 Service Pack 1

Microsoft Office Excel Viewer 2003

Microsoft Office Excel Viewer 2003 Service Pack 3

Microsoft Office Excel Viewer

Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 1

Microsoft Office 2004 for Mac

Microsoft Office 2008 for Mac

No patches or workarounds have been issued for this vulnerability.
Alternative methods of mitigation can include educating end users on
the hazards of interacting with Excel files (or any files) received
from unknown sources.  If Excel files are not a part of day to day
business practices, it may also be possible to block incoming Excel
files at an appropriate firewall and/or mail server. Ensuring user
permissions are set appropriately may also be beneficial.  In the event
of successful exploitation, a user with limited permissions will suffer
less impact than accounts working with full administrator priveledges.

Due to the lack of a software fix to this vulnerability, we recommend
alerting end users about the presence of this vulnerability, and taking
any other mitigation steps that are appropriate for your work
environment. We will be keeping a close eye on this situation, and will
send notification once patches/workarounds are available.



Information Week:

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