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Microsoft Outlook fails to properly process a VEVENT record

Vulnerability Note VU#476900

Original Release Date: 2007-01-09 | Last Revised: 2007-01-26


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


Microsoft Outlook fails to properly handle malformed VEVENT records. When an .iCal meeting request containing a VEVENT record is opened, Outlook does not properly perform data validation on the record. An attacker could send a specially crafted .ics file in the request 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.


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


Microsoft addresses this vulnerability with the updates listed in Microsoft Security Bulletin MS07-003. Note that Microsoft has documented known issues that occur after applying this update. See Microsoft Knowledgebase article 925938 for details.

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.

Vendor Information


Microsoft Corporation Affected

Updated:  January 09, 2007



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.


Microsoft addresses this vulnerability with the updates listed in Microsoft Security Bulletin MS07-003.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

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Thanks to Lurene Grenier of Sourcefire for reporting this vulnerability.

This document was written by Joseph W Pruszynski.

Other Information

CVE IDs: CVE-2007-0033
Severity Metric: 60.24
Date Public: 2007-01-09
Date First Published: 2007-01-09
Date Last Updated: 2007-01-26 13:51 UTC
Document Revision: 23

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