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ZDI-12-157 : Microsoft Excel Series Record Parsing Type Mismatch Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-157
August 22, 2012

- -- CVE ID:
CVE-2012-1847

- -- CVSS:
7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

- -- Affected Vendors:
Microsoft

- -- Affected Products:
Microsoft Office

- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 12480.
For further product information on the TippingPoint IPS, visit:

    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 visit a
malicious page or open a malicious file.

The specific flaw exists within the parsing of Series records. The code
within Excel.exe makes an assumption about the data types within a Series
record and can be made to write beyond the bounds of a heap buffer when a
specific combination of fields are set to unexpected values. This
corruption can be leveraged to achieve code execution under the context of
the user running the application. 

- -- Vendor Response:
Microsoft has issued an update to correct this vulnerability. More details
can be found at:
https://technet.microsoft.com/en-us/security/bulletin/MS12-030

- -- Disclosure Timeline:
2012-01-24 - Vulnerability reported to vendor
2012-08-22 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:
* Anonymous

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