Advisory Details

November 10th, 2009

Microsoft Excel Shared Feature Header Pointer Offset Memory Corruption Vulnerability

ZDI-09-083
ZDI-CAN-587

CVE ID CVE-2009-3129
CVSS SCORE
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office Excel
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 9231. For further product information on the TippingPoint IPS: http://www.tippingpoint.com
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft Office Excel. User interaction is required to exploit this vulnerability in that the target must open a malicious spreadsheet.

The specific flaw exists in the handling of Shared Feature Header (0x867) tags in an Excel BIFF file format. When processing the cbHdrData size element of the FEATHEADER it is possible to directly control the distance of a calculated pointer. This condition can be leveraged successfully to execute arbitrary code under the context of the currently logged in user.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://www.microsoft.com/technet/security/bulletin/MS09-067.mspx
DISCLOSURE TIMELINE
  • 2009-10-20 - Vulnerability reported to vendor
  • 2009-11-10 - Coordinated public release of advisory
CREDIT Anonymous
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