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Vulnerability Note VU#706668
Microsoft Excel fails to properly process malformed DATETIME records
OverviewMicrosoft Excel contains a vulnerability in the handling of malformed DATETIME records, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
I. DescriptionMicrosoft Excel contains a vulnerability that could be exploited when Excel opens a specially crafted document. The vulnerability is caused by incorrect handling of malformed DATETIME records. This vulnerability affects both Windows and Mac versions of ExcelII. ImpactBy convincing a user to open a specially crafted Excel document, an attacker could execute arbitrary code with the privileges of the user running Excel. If the user is logged in with administrative privileges, the attacker could take complete control of a vulnerable system. This vulnerability may also cause Excel to crash.III. SolutionApply an update
This vulnerability is addressed in Microsoft Security Bulletin MS06-059.
Do not open untrusted Excel documents
Do not open unfamiliar or unexpected Excel or other Office documents, particularly those hosted on web sites or delivered as email attachments. Please see Cyber Security Tip ST04-010.
Disable automatic opening of Excel documents
By default, Excel 97 and Excel 2000 will configure Internet Explorer to automatically open Excel documents. This feature can be disabled by using the Office Document Open Confirmation Tool. Mozilla Firefox users should disable automatic opening of files, as specified in the Securing Your Web Browser document.
Do not rely on file name extension filtering
In most cases, Windows will call Excel to open a document even if the document has an unknown file extension. For example, if spreadsheet.qwer contains the correct file header information, Windows will open presentation.qwer with Excel. Filtering for common extensions (e.g., .xls and .xlt) will not detect all Excel documents. Additionally, a Excel file with no file extension will also open with the Excel application.
Systems Affected
References
http://www.microsoft.com/technet/security/bulletin/ms06-059.mspx
http://www.microsoft.com/downloads/details.aspx?familyid=8B5762D2-077F-4031-9EE6-C9538E9F2A2F
http://www.securityfocus.com/bid/20344
Credit
This vulnerability was reported by Microsoft, who in turn credit Manuel Santamarina Suarez.
This document was written by Will Dormann.
Other Information
| Date Public | 10/10/2006 |
| Date First Published | 10/10/2006 03:54:53 PM |
| Date Last Updated | 02/27/2007 |
| CERT Advisory | |
| CVE Name | CVE-2006-2387 |
| US-CERT Technical Alerts | |
| Metric | 25.82 |
| Document Revision | 6 |
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