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Research > Zero-Day Tracker > 20090224

Excel Invalid Object

Date Disclosed:
2/24/2009

Date Patched:
06.21.2010

Vendor:
Microsoft

Affected Software:
Microsoft Excel 2000
Microsoft Excel XP
Microsoft Excel 2003
Microsoft Excel 2007
Microsoft Excel Viewer 2003
Microsoft Excel 2002 (XP)
Microsoft Excel 2000
Microsoft Excel 2004 for Mac

Description:
A remote code execution vulnerability exists within Microsoft Excel which may allow for a remote attacker to execute arbitrary code under the context of the logged in user. This vulnerability requires user interaction. In a web-based scenario (e-mail, Web site), a user would still have to open a file manually, as it would not be auto-opened.

Severity:
High

Code Execution:
Yes

Impact:
Arbitrary code execution under the context of the logged in user
This client-side file-format vulnerability has high impact potential for targeted attacks against networks. These attacks could be used to gain sensitive information, install botnet software, as well as many other common exploitations. Although Office files are not auto-opened by most web browsers and e-mail clients, the severity of this vulnerability should not be overlooked.

Mitigation:
MOICE can help mitigate this vulnerability, as per Microsoft's advisory.

Protection:

Links:

Status:
2.24.2009 - Original Advisory Posted

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