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Vulnerability Note VU#187028
Microsoft PowerPoint fails to properly handle malformed object pointers
OverviewMicrosoft PowerPoint contains a vulnerability in the handling of malformed object pointers, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
I. DescriptionMicrosoft PowerPoint contains a vulnerability that could be exploited when PowerPoint opens a specially crafted document. The vulnerability is caused by incorrect handling of malformed object pointers. This vulnerability affects both Windows and Mac versions of PowerPoint.II. ImpactBy convincing a user to open a specially crafted PowerPoint document, an attacker could execute arbitrary code with the privileges of the user running PowerPoint. If the user is logged in with administrative privileges, the attacker could take complete control of a vulnerable system. This vulnerability may also cause PowerPoint to crash.III. SolutionApply an update
This vulnerability is addressed in Microsoft Security Bulletin MS06-058.
Do not open untrusted PowerPoint documents
Do not open unfamiliar or unexpected PowerPoint 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 PowerPoint documents
By default, PowerPoint 97 and PowerPoint 2000 will configure Internet Explorer to automatically open PowerPoint 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 PowerPoint to open a document even if the document has an unknown file extension. For example, if presentation.qwer contains the correct file header information, Windows will open presentation.qwer with PowerPoint. Filtering for common extensions (e.g., .ppt, .pot, and .pps) will not detect all PowerPoint documents. Additionally, a PowerPoint file with no file extension will also open with the PowerPoint application.
Systems Affected
References
http://www.microsoft.com/technet/security/bulletin/ms06-058.mspx
http://www.zerodayinitiative.com/advisories/ZDI-06-032.html
http://www.microsoft.com/downloads/details.aspx?familyid=8B5762D2-077F-4031-9EE6-C9538E9F2A2F&displaylang=en
Credit
This vulnerability was reported by Microsoft, who in turn credit Arnaud Dovi.
This document was written by Will Dormann.
Other Information
| Date Public | 10/10/2006 |
| Date First Published | 10/10/2006 03:29:54 PM |
| Date Last Updated | 10/11/2006 |
| CERT Advisory | |
| CVE Name | CVE-2006-3435 |
| US-CERT Technical Alerts | |
| Metric | 25.82 |
| Document Revision | 6 |
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