ZDI-09-040: Microsoft Office Excel QSIR Record Pointer Corruption Vulnerability

ZDI-09-040: Microsoft Office Excel QSIR Record Pointer Corruption
Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-09-040
June 10, 2009

– CVE ID:
CVE-2009-1134

– Affected Vendors:
Microsoft

– Affected Products:
Microsoft Office Excel

– Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Microsoft Office Excel. Exploitation
requires user interaction in that a victim must open a malicious XLS
file.

The specific flaw exists within the parsing of the BIFF file format used
by Microsoft Excel. When Excel 2007 encounters a malformed Qsir record
(0x806) user data is improperly handled leading to potential code
execution. Successful exploitation of this can lead to a remote
compromise of the affected system running 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/MS09-021.mspx

– Disclosure Timeline:
2009-03-26 - Vulnerability reported to vendor
2009-06-10 - Coordinated public release of advisory

– Credit:
This vulnerability was discovered by:
* Anonymous

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