Microsoft Excel fails to properly process a malformed Column record

Overview

Microsoft Excel contains a memory corruption vulnerability that could enable an attacker to exectue arbitrary code and gain complete control of the vulnerable system.

Description

Microsoft Excel fails to properly handle malformed Column records. When an Excel file is opened, Excel does not properly perform data validation on the Column record. An attacker could send a specially crafted Column record in the Excel file that, when opened, could corrupt system memory allowing the attacker to execute arbitrary code. The attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

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Impact

An attacker could gain complete control of the affected system and execute arbitrary code.

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Solution

Microsoft addresses this vulnerability with the updates listed in Microsoft Security Bulletin MS07-002.

Note that Microsoft has re-released the updates in Microsoft Security Bulletin MS07-002 for Excel 2000. See the Microsoft Security Response Center blog for more information.

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Users whose accounts are configured to have fewer user rights on the system could be less affected than users who operate with administrative user rights.

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Vendor Information

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Updated: January 23, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

See <http://www.microsoft.com/technet/security/Bulletin/MS07-002.mspx&gt; for more details.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23302836 Feedback>).

CVSS Metrics

Group	Score	Vector
Base	0	AV:–/AC:–/Au:–/C:–/I:–/A:–
Temporal	0	E:ND/RL:ND/RC:ND
Environmental	0	CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND

References

• <http://www.microsoft.com/technet/security/Bulletin/MS07-002.mspx&gt;
• <http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=460&gt;
• <http://www.securityfocus.com/bid/21925&gt;
• <http://securitytracker.com/alerts/2007/Jan/1017487.html&gt;
• <http://blogs.technet.com/msrc/archive/2007/01/18/re-release-of-ms07-002-for-excel-2000.aspx&gt;

Acknowledgements

Thanks to Greg MacManus of iDefense Labs for reporting this vulnerability.

This document was written by Joseph Pruszynski.

Other Information

CVE IDs:	CVE-2007-0030
Severity Metric:	60.24 Date Public: