Advisory Details

July 11th, 2006

Microsoft Office Excel File Rebuilding Code Execution Vulnerability

ZDI-06-022
ZDI-CAN-045

CVE ID CVE-2006-2388
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 4330. 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. Exploitation requires that the attacker coerce the target into opening a malicious .XLS file.

The specific flaw exists within the rebuilding of malformed cell comments. When Excel encounters a malformed record it attempts to rebuild the broken meta-data. A flaw in this rebuilding process allows the user to specify critical data offsets eventually leading to code execution with the credentials of the current 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/MS06-037.mspx
DISCLOSURE TIMELINE
  • 2006-06-15 - Vulnerability reported to vendor
  • 2006-07-11 - Coordinated public release of advisory
CREDIT Arnaud Dovi 'class101' http://heapoverflow.com
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