Advisory Details

December 9th, 2008

Microsoft Office RTF Consecutive Drawing Object Parsing Heap Corruption Vulnerability

ZDI-08-084
ZDI-CAN-334

CVE ID CVE-2008-4027
CVSS SCORE
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Office Word
Outlook
TREND MICRO CUSTOMER PROTECTION Trend Micro TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 6607. 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. User interaction is required to exploit this vulnerability in that the target must visit a malicious page, open a malicious e-mail, or open a malicious file.

The specific flaw exists when parsing malformed RTF documents. When processing consecutive "\do" Drawing Object tags mso.dll does not properly verify the integrity of the object and frees a memory buffer twice, leading to heap corruption. Successful exploitation can lead to remote compromise of a system under the credentials of the currently logged in user.

VENDOR RESPONSE Microsoft has issued an update to correct this vulnerability. More details can be found at:
http://www.microsoft.com/technet/security/bulletin/MS08-072.mspx
DISCLOSURE TIMELINE
  • 2008-05-19 - Vulnerability reported to vendor
  • 2008-12-09 - Coordinated public release of advisory
CREDIT wushi of team509
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